40 results about "Mature stage" patented technology

The invention relates to the technical field of intelligent control, in particular to a greenhouse environment digital intelligent control method and device, and the method comprises the steps: obtaining environment data and crop form data in a greenhouse; the crop shape data are analyzed, and the growth stages of the crops are obtained and comprise the seedling stage, the growth stage, the flowering stage, the fruiting stage and the mature stage; inputting the environment data and the growth stage of the crop into a crop demand matching model, and obtaining the matching degree of the current environment in the greenhouse and the growth stage of the crop; if the matching degree is greater than or equal to the target threshold, the environment does not need to be controlled; and if the matching degree is smaller than a target threshold value, generating an environment regulation and control strategy according to an NSGA-II algorithm, and generating an environment regulation and control instruction according to the environment regulation and control strategy to control the environment change in the greenhouse. Therefore, the problems of lack of crop growth stage consideration, insufficient multi-objective optimization capability and the like in an existing control system are solved.

The present application relates to the technical field of peanut variety creation and breeding, and particularly relates to a screening method of selenium-rich high-yield peanut core germplasm. The screening method comprises the following steps: using a selenium solution to culture peanut seeds to be screened, using peanut seeds to be screened cultured by sterile water as a control, screening peanut seeds with root length higher than the control by more than 10%, and obtaining selenium-sensitive peanut seeds; after sowing the selenium-sensitive peanut seeds, performing selenium treatment, using corresponding selenium-sensitive peanut seeds cultured by sterile water as a control, after one week of selenium treatment, screening peanut seeds with plant height and aboveground dry matter weight higher than the corresponding control, and obtaining selenium-rich peanut germplasm; sowing the selenium-rich peanut germplasm, using Zhonghua No. 16 as a control, screening peanut seeds with pod yield per plant higher than the control at the mature stage, and obtaining selenium-rich high-yield peanut core germplasm. The present application has the advantages of low cost, quantification, repeatability, high efficiency and easy implementation.

The invention belongs to the technical field of plant genetic engineering, and particularly relates to a method for improving drought resistance of rice. By knocking out the DRG1 gene and combining deep root ratio phenotype identification and seedling stage and mature stage drought stress phenotype identification results, when the gene segment is deleted, the deep root ratio of rice is reduced, the drought stress resistance is reduced, and the function and application approach of the gene are proved.

The invention provides bacillus methylotrophicus N7, a preparation and application of the bacillus methylotrophicus N7 to prevention and control of soybean cyst nematode, and belongs to the technical field of microorganisms. The preservation number of the bacillus methylotrophicus N7 is CGMCC (China General Microbiological Culture Collection Center) No.31391, and the bacillus methylotrophicus N7 is obtained by mutagenizing an original strain The strain is suitable for soybean low-temperature producing areas at 5-20 DEG C, has high soybean cyst nematode resistance, the cyst inhibition rate of a high-concentration group in the seedling stage is over 70%, the soybean yield in the mature stage is increased by 24.6% compared with a blank control, and the strain is non-toxic, free of residues and eco-friendly to soil.

This invention relates to the field of bioengineering technology and provides an application of the maize heat shock transcription factor gene ZmHSF18, wherein the nucleotide sequence of the maize heat shock transcription factor gene ZmHSF18 is shown in SEQ ID NO:1. Experiments have demonstrated that overexpression of the maize heat shock transcription factor gene ZmHSF18 in plants can significantly improve seed germination rate and frozen survival rate at the mature stage under low-temperature stress, reduce malondialdehyde accumulation, and increase superoxide dismutase activity. Therefore, this maize heat shock transcription factor gene ZmHSF18 can be used to improve plant cold tolerance and create transgenic plants with enhanced cold tolerance, possessing important application value in plant genetic engineering and stress resistance breeding.

The present application belongs to the poplar plantation technical field, and particularly relates to a poplar plantation structure optimization and sustainable management method and system. The method comprises the following steps: S1, constructing a growth model of poplar, and dividing the poplar into three stages of a juvenile stage, a middle-aged stage and a near-mature stage according to the growth model; S2, collecting site factor data; S3, dividing the research area into multiple site grade areas, and configuring differentiated growth parameters, rotation periods and felling intensities for the site grade areas; S4, building a multi-objective linear programming model, and the objective function covers maximization of total wood yield, minimization of management cost and maximization of ecological benefit; S5, linearly fitting the juvenile stage, the middle-aged stage and the near-mature stage to obtain the corresponding linear equations of the stages, embedding the linear equations of S2 into the multi-objective linear programming model as constraint conditions, and clearly defining the forest age range of each stage; and S6, solving the multi-objective linear programming model to obtain optimal felling area, rotation period and felling intensity parameters.

The present application belongs to the technical field of plant morphology, and particularly relates to a seed plant propagule three-dimensional shape measurement method based on a video stereomicroscope, comprising: collecting seed plant propagules at the mature stage and air-drying to a constant weight; classifying the propagules according to the seed, fruit shape and surface accessory structure, and determining the measurement criteria of the shape of different categories of propagules; scanning the three-dimensional structure of each category of propagule by using a video stereomicroscope, and accurately measuring the shape parameters length, width and thickness of the propagule; normalizing each category of propagule, calculating the shape index of the propagule, and representing the closeness to a spherical shape. The method quantifies the complex three-dimensional shape characteristics of the seed plant propagule into a comprehensive shape index, realizes accurate quantitative measurement and digitization of the morphological characteristics of the propagule, solves the pain point of determining the shape of the propagule by using a traditional observation tool, and facilitates the comparative identification of the three-dimensional shapes of different categories of seed plant propagules.

The invention belongs to the field of beekeeping, and relates to a method for controlling mating of queen apis cerana by using a queen bee fixing device, and by designing the specially-made queen bee fixing device, the device can mildly and stably limit the activity range of the queen bee, and meanwhile, the physiological safety and health of the queen bee are ensured. In the sexual maturity stage of the queen bee, the queen bee is placed in the device and placed in a specific mating site, the range and intensity of pheromone released by the queen bee are controlled through the device, drones are attracted to come to mate, and the problems that in natural mating, the queen bee flies away, bad weather influences exist, and non-target drone interference exists are effectively solved. By accurately regulating and controlling the mating environment and time, the mating success rate and the offspring quality are improved. The method is easy and convenient to operate, small in bee colony interference and beneficial to improvement of Chinese bee breeding benefits and population genetic diversity management, and a new way is provided for scientific breeding and breed conservation and breeding of Chinese bees.

This utility model belongs to the field of passion fruit technology, and in particular to a climbing device for passion fruit cultivation. It includes an adjustable climbing structure with outward-expanding climbing structures on both the front and rear sides, and reinforced support structures on both sides. Through the adjustable climbing structure and the reinforced support structures, the reinforced support structures effectively support the adjustable climbing structure, ensuring its stability. Furthermore, the device possesses high flexibility and adaptability, allowing for precise adjustments based on the actual needs of passion fruit at different growth stages. Whether it's the initial climbing during the seedling stage or the vigorous growth during the mature stage, this structure provides just the right amount of support and guidance, not only helping the vines achieve even distribution throughout the growth process but also effectively preventing insufficient light caused by overly dense vines.

The invention relates to the technical field of Chinese chestnut screening, in particular to a Chinese chestnut shell maturity classification method and system and a storage medium. The classification method comprises the steps that a Chinese chestnut image data set in a natural scene is collected, a chestnut shell position frame and maturity grades are marked, and the maturity grades are divided into an immature stage, a half-mature stage of transition from turquoise to yellowish-brown, a yellowish-brown mature stage and an over-mature stage of cracking and deterioration according to chestnut shell color change characteristics; and forcibly marking the target of which the shielding area exceeds 30% as an immature stage, and not marking the long-range target of which the maturity cannot be identified. According to the method, a deep coupling mechanism of the target characteristics and the model architecture is established, a noise transmission path is blocked from a data source, and the tolerance of the model to illumination variation and angle distortion is remarkably enhanced in cooperation with the combined effect of pre-enhancement and online random enhancement.

The invention particularly relates to application of an OsBB4 gene in illumination-dependent regulation of rice growth traits and yield traits. Wild type rice and OsBB4 silent homozygous mutant seeds are subjected to germination accelerating culture under the natural light condition and the weak light condition respectively, then seedlings are transplanted to an outdoor field for growth, photographing is carried out in the mature period, plant types are recorded, and the number of grains per ear and the thousand seed weight are counted. Results show that after natural light germination accelerating culture, the plant height, the number of grains per ear and the thousand seed weight of the mutant in the seedling stage and the mature stage are obviously lower than those of a wild type; after weak light germination accelerating culture, the plant heights of the two types have no significant difference in the mature period, but the number of grains per ear and thousand seed weight of the mutant are significantly higher than those of the wild type. According to the invention, the functional characteristics of the OsBB4 gene are clarified, a strategy for improving the gene to restore the plant type is provided aiming at the characteristic that the OsBB4 silent homozygous mutant responds to weak light, and finally the purpose of increasing the rice yield by increasing the number of grains per ear and the thousand seed weight is achieved. The invention provides important experimental basis and technical reference for rice high-yield cultivation optimization and molecular breeding.

The invention provides a method for monitoring the effectiveness of a rice blast-resistant gene in a field. The method comprises the following steps: selecting a rice blast-resistant single-gene variety, a hybrid rice parent / resistant source and a main cultivated variety as test varieties; after the test variety is sown in line, the to-be-induced variety and the susceptible control are fully diseased, and the seedling leaf blast levels of the other varieties are investigated; randomly arranging and planting the to-be-tested varieties in a field according to districts, and planting inducing varieties around the field; leaf blast resistance identification is carried out in the tillering stage, and neck blast resistance identification is carried out in the yellow ripening initial stage. Based on identification results of leaf blast and neck blast of a single-gene variety and a hybrid rice parent / resistance source in two consecutive years, obtaining a resistance gene effectiveness monitoring result; dNA of the main cultivated variety is extracted to detect the resistance gene, and the monitoring reliability of the method is verified by combining the resistance identification result. According to the invention, a specific rice material is used for monitoring in a regional representative field disease nursery, and effective rice blast resistance genes or combinations in rice breeding and production in a specific rice region can be directly screened out.

The invention discloses a tenebrio molitor pupa breeding technology and an eating method, and belongs to the technical field of tenebrio molitor pupae. The breeding process comprises the following steps: preparing feed by taking wheat bran, selenium-enriched yeast, selenium-enriched vegetables and traditional Chinese medicinal material powder as raw materials, and feeding tenebrio molitor larvae until the tenebrio molitor larvae grow to a mature stage; placing the mature larvae of the tenebrio molitor in a low-temperature environment of 0-12 DEG C for refrigeration; when fresh pupae are required to eat, the refrigerated mature tenebrio molitor larvae are recovered and pupated at the temperature of 25-35 DEG C, and the fresh pupae pupated within 15 min are obtained. According to the method, pupation centralization of the tenebrio molitor larvae is achieved, instant supply of fresh pupae is guaranteed, commercialization requirements are met, the nutritional quality of the fresh pupae is improved, the problem of side effects possibly caused by eating of the fresh pupae is solved, and the aim of conditioning the body of the tenebrio molitor pupae is achieved.

The application discloses a cadmium-polluted paddy field rice-shrimp co-cultivation method using sulfate-reducing bacteria, which comprises the following steps: step 1, spraying diluted SRB bacterial agent propagation liquid in the cadmium-polluted paddy field to be treated, then making the bacterial agent fully contact with the soil in the form of rotary tillage, and adding water in the paddy field to a depth of 5-10 cm, wherein the cadmium content in the cadmium-polluted paddy field to be treated is 0.40-1.50 mg / kg, and the pH of the cadmium-polluted paddy field ranges from 5.5 to 6.5; step 2, monitoring the redox potential of the soil in the paddy field until the redox potential value of the soil is monitored to be below-150 mV within a preset time period, and then performing rice transplanting operation; step 3, after 10-15 days of rice transplanting, putting Australian freshwater lobster fry with a body length of 2-5 cm; and step 4, harvesting rice and lobsters at the mature stage of the rice respectively. The application aims to significantly reduce the cadmium content in rice and the availability of soil cadmium through the sulfate-reducing bacteria and rice-shrimp co-cultivation system.

The application provides a methylotrophic bacillus N7, a preparation and application thereof in prevention and control of soybean cyst nematode, and belongs to the technical field of microorganisms. The methylotrophic bacillus N7 has a preservation number of CGMCC No.31391, and is obtained by mutagenizing an original strain N1 with 0.4% ethyl methanesulfonate. The methylotrophic bacillus N7 is suitable for a low-temperature soybean production area with a temperature of 5 to 20 DEG C, has high resistance to soybean cyst nematode, a cyst inhibition rate of a high-concentration group in a seedling stage is higher than 70%, a soybean yield in a mature stage is increased by 24.6% compared with a blank control, is non-toxic and non-residual, and is friendly to soil ecology.

The invention relates to the technical field of plant physiology and ecology, and discloses a simulation calculation method based on a plant physiology and ecology model, which comprises the following steps: acquiring plant growth environment parameters: soil humidity (H), illumination intensity (L), temperature (T) and initial plant accumulation (Gs), and acquiring data through an acquisition module; according to the simulation calculation method based on the plant physiology and ecology model, the calculation process is simplified, the micro-level problem is simplified into the problems of plant accumulation and absorption capacity, and compared with a traditional simulation algorithm, the calculation complexity is greatly reduced, the requirement for calculation resources is lowered, and the calculation efficiency is improved. According to the method, plant growth simulation calculation can be quickly carried out on common calculation equipment, initial conditions are flexible, calculation can be carried out by taking any state of the plant as an initial parameter, plants in a seedling stage, a growth stage or a mature stage can be used as simulation starting points, and convenience is provided for plant growth management in different stages.

The application discloses ZmRLR1 application of a gene and a coded protein in regulating corn root development. ZmRLR1 The nucleotide sequence of the gene is shown in the sequence table SEQ ID No: 1, and the protein sequence is shown in the sequence table SEQ ID No: 2. The number of lateral root primordia, the total length of lateral roots and the total lateral root density of the seedling stage of the ZmRLR1 protein overexpression transgenic plant are significantly increased, the number and size of the root system of the fifth layer of crown roots at the mature stage are significantly increased, and the weight of the rhizosphere soil is increased.

This method for adjusting the maturation of an ovary of crustacean comprises a breeding step for adjusting a breeding temperature of an individual crustacean having one or more tails to adjust a maturation frequency of the ovary. This method for producing the hatched larvae of crustacean comprises: a preparation step for preparing an individual crustacean that has reached an egg-producing weight and has one or more tails; and a breeding step for breeding the individual crustacean so as to set an immature period and a maturation period to freely selected periods, and obtaining hatched larvae from fertilized eggs released by the individual crustacean. In the breeding step, the breeding temperature of the individual crustacean is adjusted to adjust the maturation frequency of the ovary.

The application provides a fruit picking method, system and device based on target recognition and a storage medium, and relates to the technical field of computer vision.The application collects image data of a fruit to be recognized, performs preprocessing, constructs a fruit maturity prediction model by using a convolutional neural network, inputs the preprocessed image data into the model, outputs a maturity index of the fruit, further extracts key features in the fruit image, calculates the difference between the maturity stage and the fruit image features, generates a difference index, corrects the maturity index of the fruit, sets a maturity threshold, and judges whether the fruit has reached a picking standard.The application realizes accurate judgment of fruit maturity and automatic picking by combining image processing, feature data analysis and a machine learning model.

The invention relates to the technical field of plant biological breeding, in particular to application of OsRH11 protein and a coding gene thereof in controlling male reproductive development of rice. The rice OsRH11 gene is separated and cloned, and it is found that a rice plant with the OsRH11 gene knocked out is pollen-free abortion; the pollen fertility of the complemented plant line is recovered, and the single plant maturing rate in the mature period is close to that of a wild type. Therefore, the invention newly finds a gene, namely the OsRH11 gene, related to the male sterility of the rice. Meanwhile, the reason of rice male sterility caused by gene mutation is discussed, the molecular mechanism of rice male sterility pollen abortion is clarified, the cognition of people on the rice male sterility molecular mechanism is further deepened, and a new viewpoint is provided for the molecular regulation mechanism of rice male reproductive development. The application of the male sterility gene OsRH11 gene in genetic improvement of rice varieties has important practical significance for rice breeding workers.

The invention belongs to the technical field of plant genetic engineering, and discloses application of a rice OsHT gene in improvement of drought resistance of rice. Clustered regularly interspaced short palindromic repeats (CRISPR) mutant phenotype identification is carried out on candidate genes, and the OsHT gene for controlling rice drought response is successfully cloned. The drought stress phenotype identification results in the seedling stage and the adult-plant stage show that when the gene segment is deleted, the drought stress resistance of the rice is obviously enhanced, so that the function of the gene and the potential of the gene in practical application are proved.

The invention relates to a potato aeroponic staging regulation nutrient solution and an application method, and belongs to the technical field of soilless culture. According to the method, differential nutrient solution formulas are respectively designed according to nutrient demand characteristics of five growth stages (a germination stage, a seedling stage, a tillering stage, a tuberization stage and a mature stage) of potatoes, the pH value is dynamically regulated and controlled to be 5.5-6.5, the EC value is gradually increased and then slightly decreased according to the growth stages, and a precise atomization application strategy is matched. A CaCl2-KNO3-KH2PO4 triangular system is adopted in the tuberization period, the problem of calcium and potassium antagonism is effectively solved, calcium absorption of tubers is remarkably improved, and the tuberization rate is lower than 3%. Liquid drops are prevented from making contact with the blades through the directional atomization and physical isolation technology, it is ensured that chlormequat chloride residues are not detected out, and the advantages of being efficient, safe and easy to operate are achieved.

The invention provides a fruit specific promoter from kiwi fruit and application thereof, and relates to the technical field of plant genetic engineering, the fruit specific promoter is a KWL (Achv4p28g043954) gene promoter, the nucleotide sequence of the KWL (Achv4p28g043954) gene is as shown in SEQ ID NO: 1, and the nucleotide sequence of the promoter is as shown in SEQ ID NO: 2. The application of the specific promoter is to regulate and control the specific expression of a target gene in kiwi fruit tissues. The gene promoter disclosed by the invention can be applied to the specific high expression of kiwi fruit tissues, and can promote the specific expression of downstream genes in the middle development stage and the mature stage of kiwi fruits. When the gene promoter is applied to transgenic engineering, the expression level of the gene can be remarkably improved, the expression product of the target gene can be specifically accumulated in the later development period of the kiwi fruit, and meanwhile, the expression interference in other tissue parts is also avoided, so that the promoter has a good application prospect in the quality improvement and transgenic engineering of the kiwi fruit.

The invention discloses an application of a tobacco single copper oxidase-like protein gene NtSKU5, the nucleotide sequence of the tobacco single copper oxidase-like protein gene NtSKU5 is shown as SEQ ID NO.1, the tobacco single copper oxidase-like protein gene NtSKU5 comprises 1818 basic groups, and the gene is derived from tobacco. According to the invention, agronomic traits of an NtSKU5 gene edited plant and a control (untransformed) plant are investigated in a squaring stage and a mature stage under normal conditions, and the plant height, stem girth, waist leaf length, waist leaf width and leaf area of the NtSKU5 gene edited plant are all higher than those of the control (untransformed). In a word, the NtSKU5 gene is knocked out by utilizing a CRISPR / Cas9 mediated gene editing technology to obtain a gene editing plant which affects the growth and development of the plant, so that a genetic material and a theoretical basis are provided for the research on the single copper oxidase-like protein of the tobacco and the research on the growth and development of the tobacco.

The invention provides an application of a GmbetaCA11 protein and / or a GmbetaCA11 gene in promoting soybean growth and / or increasing soybean yield, and belongs to the technical field of plant genetic engineering. The Gm beta CA11 gene is a gene for coding soybean carbonic anhydrase. By enhancing the expression level of the GmbetaCA11 gene and increasing the accumulation amount of the GmbetaCA11 protein in soybean bodies, the soybean growth and development process can be effectively regulated and controlled, the soybean plant growth can be remarkably promoted, and the soybean yield related traits can be improved. Through overexpression of the GmbetaCA11 gene in soybeans, the plant height and yield can be significantly increased; the plant height and single plant yield of the transgenic plant in the mature period are obviously higher than those of a control plant, and the growth situation in the seedling period is also better than that of the control plant. According to the invention, the important function of the GmbetaCA11 gene in regulation and control of soybean growth and yield formation is defined, and the GmbetaCA11 gene has important theoretical value and application prospect in cultivation of new high-yield soybean varieties.

The invention provides a greenhouse strawberry plant growth period target detection method based on improved YOLOv8s, and the method comprises the following steps: constructing an improved YOLOv8s greenhouse strawberry growth period important target detection model, and outputting the vector information of each target through a detection head; inputting the to-be-detected image into the improved YOLOv8s greenhouse strawberry growth period important target detection model to obtain an important target number of each growth period of the strawberry; the important target numbers comprise the flower number in the flowering period, the strawberry green fruit number in the green fruit period, the strawberry fruit number in the fruit expansion period and the strawberry fruit number in the mature period; obtaining the number of important targets in each growth period in each frame of image; identifying the growth period of the greenhouse strawberries by using the number of the important targets in each growth period in each frame of image; according to the recognized growth period of the greenhouse strawberries, micro-nano bubbles are selectively added into an irrigation system. The method can remarkably improve the recognition accuracy of the growth period of the greenhouse strawberries.

The utility model relates to the technical field of cell screening, and discloses a simple and convenient device for rapidly screening mature period VI oocytes of Xenopus laevis, which comprises a transparent plastic cup, a removable mounting rack is arranged in an inner cavity of the transparent plastic cup, and an upper-layer screen and a lower-layer screen are sequentially arranged on the mounting rack from top to bottom. The upper-layer screen and the lower-layer screen are arranged in parallel, broken mature period VI oocyte cells can be conveniently left on the upper-layer screen through the upper-layer screen, oocytes below mature period V can be left at the bottom of the plastic cup through the screen, mature period VI oocyte cells needed by experiments can be left between the two layers of screens, and the oocytes below the mature period V can be left in the middle of the two layers of screens. The middle oocytes are carefully sucked by a rubber head dropper by removing the upper-layer screen, so that the mature period VI oocytes of the Xenopus laevis can be quickly screened, the mature period VI oocytes of the Xenopus laevis required by experiments can be quickly and efficiently screened, and time and labor are saved.

The invention discloses application of HG1 in regulating and controlling the heading stage, the mature stage and the plant height of a plant. The invention finds that the heading stage of the plant can be obviously delayed by a method for overexpressing or up-regulating the HG1 gene or homologous genes thereof or increasing the expression of the HG1 gene; by knocking out or down-regulating the HG1 gene or the homologous gene thereof, the heading period and the mature period of the plant can be obviously advanced, the plant height is dwarfed, and the lodging resistance of the plant is improved. The achievement of the invention has important enlightenment significance in the field of plant breeding, provides a new strategy and method for cultivating plant varieties with specific growth and development characteristics, and is helpful for promoting further development of plant biology and agricultural science.

This utility model discloses an integrated device for plant seedling maintenance, relating to the field of seedling maintenance technology. It includes a support frame, of which multiple supports are provided, and a ring-shaped support member is fixedly connected to the top of each support frame. A ring-shaped irrigation member is slidably connected to the center of the bottom of the ring-shaped support member. When it is necessary to adaptively adjust the irrigation height of the irrigation nozzle, the positioning pin on the outer wall of the sliding plate can be pulled outwards, separating its end from the positioning hole. After being pulled out, the ring-shaped irrigation member can be slid up and down along the guide groove and slide of the support frame according to actual needs until the irrigation nozzle is aligned with the target irrigation area. Then, the positioning pin is released, allowing it to be inserted into the positioning hole of the corresponding height under the action of a compression spring, quickly locking the height of the ring-shaped irrigation member. The irrigation height can be adjusted according to the root distribution characteristics of the seedling and mature stages of the plant.

The invention discloses a corn hybrid germplasm resource saline-alkaline tolerant system as well as a construction method and application thereof, and belongs to the technical field of agricultural biology. The corn hybrid germplasm resource saline-alkaline tolerance system comprises evaluation subsystems of a germination stage, a seedling stage and a mature stage; in the germination stage, a mixed saline-alkaline solution with a specific ratio is adopted for stress, and a vitality index, relative water content, root length, root dry weight and germination rate are screened as key indexes; saline-alkali soil potting stress is adopted in the seedling stage, and fresh leaf weight, SOD activity, POD activity, relative water content and chlorophyll content are screened as key indexes; in the mature period, through saline-alkali soil field tests, hundred-grain weight and single spike weight are screened as key indexes. And calculating a comprehensive evaluation value of saline-alkaline tolerance of each stage through principal component analysis and a membership function method, so as to realize accurate grading of germplasm resources. The invention provides a systematic and reliable technical scheme for identification and breeding of saline-alkaline tolerant germplasm of corn.