32 results about "Photosystem" patented technology

The invention provides a method for estimating the photosynthetic nitrogen content of rice leaves based on sunlight-induced chlorophyll fluorescence. The method comprises the following steps: acquiring an observed value SIF of canopy sunlight-induced chlorophyll fluorescence based on induction equipment, and converting the observed value SIF into a total fluorescence excitation value SIFPSII of a light system II; on the basis of the rice photosynthetic physiological process, the incident photosynthetically active radiation I and the total fluorescence excitation value SIFPSII of a light system II, the electron transmission rate J is obtained through calculation, and the maximum electron transmission rate Jmax is obtained through calculation; then, the maximum carboxylation rate Vcmax is calculated based on the electron transmission rate J, so that the photosynthetic nitrogen content Ncb distributed to a carboxylation system and the photosynthetic nitrogen content Net distributed to an electron transmission system are calculated respectively, and the photosynthetic nitrogen content Ncb and the photosynthetic nitrogen content Net are superposed to obtain an estimated value PN of the photosynthetic nitrogen content of the leaves. According to the method, accurate estimation of the photosynthetic nitrogen content of the rice leaves is realized based on the mechanism relation between sunlight-induced chlorophyll fluorescence and the photosynthesis process of the rice, and accurate estimation of the photosynthetic nitrogen content of the rice in the field and regional scale can be realized.

The invention relates to the technical field of agricultural lighting, in particular to a rubber forest multiband bionic light supplementing system. The device is composed of a light source module, an environment sensing module, an intelligent control module and an adjustable supporting structure. The light source module is composed of at least three LED units with different wave bands, and the light intensity proportion of each wave band can be independently adjusted. The environment sensing module collects light environment parameters and meteorological data of a rubber forest canopy in real time. The intelligent control module dynamically adjusts the light intensity proportion of each wave band based on a light response curve of photosynthesis of the rubber tree and feedback data of the environment sensing module; the adjustable supporting structure adopts a modular truss design. The invention provides a multi-band bionic light supplementing system capable of simulating the dynamic characteristics of natural light and self-adapting to the physiological needs of rubber trees, and accurate matching of light quality, light intensity and light period is realized through intelligent sensing and dynamic regulation, so that the photosynthetic efficiency, the latex yield and the energy sustainability are improved.

The invention discloses a function unannotated protein CpsA and application thereof, and belongs to the technical field of biochemistry. The CpsA protein provided by the invention is a thylakoid membrane protein which is coded by synpcc79421022 in synechococcus slender PCC 7942, and the function of the thylakoid membrane protein is not annotated. The protein can be specifically combined with an early PSII assembly factor Psb28, formation and stability of a PSII final oxygen evolution complex are promoted, and the assembly efficiency of a light system II and formation of a functional complex are remarkably improved. In addition, the CpsA protein is highly conserved in cyanobacteria, microalgae and land plants, and has wide application potential.

The present disclosure provides a transgenic plant comprising one or more nucleotide sequences encoding polypeptides selected from photosystem II subunit S (PsbS), zeaxanthin epoxidase (ZEP), and violaxanthin de-epoxidase (VDE), operably linked to at least one expression control sequence. Expression vectors for making transgenic plants, and methods for increasing biomass production and / or carbon fixation and / or growth in a plant comprising increasing expression of at least one of PsbS, ZEP and VDE polypeptides are also provided.

This invention is directed to a mixture comprising bixlozone and at least one herbicide selected from photosystem I electron diverters and agriculturally acceptable salts and esters thereof. The invention is also directed to an agrochemical composition of the mixture and a method of using the mixture or composition.

The invention discloses a three-dimensional irradiation water conveyance canal ecological management system and method based on a deep ultraviolet LED, and belongs to the field of ecological management. The system comprises a shore-based irradiation subsystem, a suspended mobile irradiation subsystem, a photovoltaic power supply subsystem and an intelligent control subsystem; 275nm deep ultraviolet light is used for accurately destroying an algae light system II reaction center (the PsbA protein inactivation rate is greater than 95%), and 235nm auxiliary wavelength is combined for decomposing organic pollutants, so that algae inactivation and water purification are synchronously realized. The suspension unit adopts a ball screw lifting mechanism (the positioning precision is + / -2mm) to adapt to water level fluctuation, and the photovoltaic direct supply system reduces carbon emission by 63%. The system can reduce the algae biomass by 92% and the DOC removal rate by 41%, and has no toxic influence on fishes (LC50 is greater than 100mW / cm < 2 >). The pollution risk of a traditional mercury lamp and the ecological harm of a chemical method are overcome, and a green treatment scheme is provided for a long-distance water transfer project.

The invention relates to a multi-environment regulation and control in-situ real-time photosynthetic phenotype imaging system applied to the field of photosynthetic phenotype imaging of crop plants, which comprises an environment control system, a photoelectric control system, an image acquisition system, a plant light system, a computer, a touch screen and a plant sample cultivated in a detection box, the box type multi-environment regulation and control in-situ real-time photosynthetic phenotype imaging system realizes automatic regulation and control of test environment factors, realizes in-situ real-time monitoring and imaging of chlorophyll fluorescence parameters of plants in a box body in an experiment process, improves the accuracy of chlorophyll fluorescence parameter detection, improves the efficiency of research work, and has a wide application prospect. The detection angle of the fluorescence imaging CCD camera is parallel to the to-be-detected blade by matching with the adjusting belt, the consistency of the detection distance is ensured, the warping part is smoothed by matching with the smoothing unit, and the accuracy of the detection result is ensured.

An exemplary holographic metasurface lithography system and method that project a hologram having two or more different wavelengths of light onto a hybrid resin to simultaneously or concurrently cure / form both (i) a first material structure, e.g., a metal structure and (ii) a second material structure, e.g., a polymer structure, from the hybrid resin in the same three-dimensional space. The hologram is generated by a metasurface mask that encodes spatial information for both the metal structure and the polymer structure, and the resin has both (i) UV-sensitive metal precursors to form the metal structure and (ii) monomers, crosslinkers, wavelength-selective photosystems to form the polymer structure.

The invention relates to the technical field of photosynthesis power generation, and discloses a device and a method for realizing photosynthesis power generation based on a liquid metal-semiconductor junction. The negative electrode comprises a metal-semiconductor junction (MSJs) consisting of liquid metal and a silicon wafer; the thylakoid suspension is positioned between the positive electrode and the negative electrode and is extracted from spinach. The liquid metal is eGaInSn room temperature liquid metal. The method comprises the following steps: extracting crushed chloroplasts and thylakoid which are rich in photosynthetic devices such as a photosystem I (PSI), a photosystem II (PS) and the like in spinach leaves by using a salt solution separation method; in combination with flexible transparent indium tin oxide (ITO), the photosynthesis power generation device with the structure of Si / LMs / BBY / ITO is manufactured. The liquid metal and the silicon wafer are combined to obtain the MSJs as the negative electrode, the electron transfer efficiency of the power generation device is enhanced, the preparation is simple, the performance is excellent, and green power generation is realized.

This invention discloses a method for enhancing the high-temperature resistance of citrus through exogenous spraying of naringin, belonging to the field of agricultural technology. The method involves preparing naringin into a formulation and spraying it exogenously onto the leaves of citrus plants. Experiments show that after treatment with naringin, phenotypic damage such as wilting and curling of citrus seedling leaves under high-temperature stress is significantly alleviated; the maximum photochemical efficiency of photosystem II (Fv / Fm) is significantly increased; electrolyte leakage rate and malondialdehyde content are significantly reduced; and the accumulation of hydrogen peroxide and superoxide anions is effectively inhibited. This invention utilizes naturally sourced naringin to significantly enhance the tolerance of citrus to high-temperature stress through multiple mechanisms, including maintaining photosynthetic system function, protecting cell membrane integrity, inhibiting membrane lipid peroxidation, and scavenging reactive oxygen species. Furthermore, the method is simple to operate, environmentally friendly, and low-cost, making it suitable for stress-resistant citrus cultivation.

The present disclosure relates to methods of screening for functional gain mutations in a non-coding region of a target gene. The target gene may be an NPQ gene that includes a photosystem II subunit S (PsbS), a zeaxanthin epoxidase (ZEP), and a violaxanthin deepoxidase (VDE). The disclosure further relates to a method of improving an economic crop plant or crop seed by introducing a functional gain mutation in a non-coding region of a target gene, and an improved economic crop plant or crop seed produced by the method.

The present application relates to the technical field of submerged vegetation restoration, and particularly relates to a river submerged vegetation restoration fixed-point light supplement system with self-cleaning function; the system comprises a waterproof shell, a spectrum-optimized light source module, a secondary optical lens module, an automatic cleaning arm module and an intelligent control core module; wherein: the waterproof shell is used for providing outdoor waterproof protection; the spectrum-optimized light source module is used for outputting an optimized spectrum suitable for photosynthesis of submerged plants; the secondary optical lens module is installed on the spectrum-optimized light source module and is used for adjusting the light angle and light range; the automatic cleaning arm module is used for regularly removing algae and scale on the surface of the waterproof shell to maintain the light transmittance; and the intelligent control core module is used for unified regulation and control of the light source, cleaning action and remote interaction; in the above manner, the effects of spectrum optimization, light adjustment and automatic cleaning are achieved, the photosynthesis and growth of submerged plants are promoted, and the river ecological restoration process is accelerated.

The invention discloses a method for measuring the size and connectivity of a plant leaf light system II antenna, and relates to the field of plant leaf chlorophyll fluorescence determination.According to the method, an analytical solution of a QA reduction kinetics differential equation is provided, the uncertainty of parameter estimation is minimized, a PEA portable chlorophyll luminoscope is utilized, and the size and connectivity of a plant leaf light system II antenna are measured. A key parameter Fmj is obtained through a mathematical statistical method. According to the method for measuring the size and connectivity of the light system II antenna of the plant leaf, curve fitting and parameter calculation are carried out on the basis of solving the two technical problems, the method for reliably measuring and calculating the size and connectivity of the light system II antenna is provided, and then the method is used for related research of a photosynthesis efficiency regulation and control mechanism. The method provides a powerful tool for researching major scientific problems such as a crop high-light-effect adjusting mechanism and a forest carbon sink capacity adjusting mechanism, and has a wide application prospect.

By engineering genetic traits associated with photosynthesis in plants, transgenic plants with increased crop yield can be generated, which will ultimately lead to increased food production in the field. To obtain beneficial genetic traits for enhanced photosynthesis, accelerated evolution is applied under salt stress in a cyanobacteria species, Synechococcus elongatus PCC 7942, by conditionally suppressing its mismatch repair system. Through high-throughput screening for biomass accumulation and sucrose production, it is discovered that specific amino acid changes in the pre-Dl protein of Photosystem II (PSII), encoded by the psbA genes, can improve efficiency of photosynthesis under salt stress, as well as pathogen resistance. Next, the same amino acid changes were made in Arabadopsis and proved that photosynthetic efficiency (measured via growth rate) is also increased in this model vascular plant.

This invention discloses a photosynthetic nanomotor powered by a biomolecular motor and its preparation method, belonging to the field of colloidal motors. This invention aims to address the current limitations of research on the rotational dynamics of FoF1-ATP synthase molecular machines, which is limited to the motion of single and isolated objects. The photosynthetic nanomotor is prepared based on supramolecular self-assembly technology through the reconstruction of thylakoid vesicles and lecithin vesicles. The photophosphorylation system on the thylakoid membrane surface is reconstructed on the photosynthetic nanomotor. Utilizing the preserved biomolecular motor FoF1-ATPase as the power engine, under external visible light irradiation, protons generated by the photosystem accumulate in the photosynthetic liposome motor, driving the FoF1-ATPase to synthesize the energy currency ATP. Through metabolic reactions, light energy is converted into chemical energy ATP, ultimately generating self-propulsion. Due to its unique energy currency regeneration capability, the photosynthetic liposome motor has broad application prospects in the biomedical field.

The present invention discloses the use of a jasmonic acid inhibitor DIECA in promoting the growth and development of plant seedlings, and belongs to the technical field of plant growth promotion. The present invention uses the jasmonic acid inhibitor DIECA as a plant inducer to effectively improve the plant height, stem thickness, leaf area, and growth and development of tomato seedlings, and can increase the content of photosynthetic pigments in the leaves, as well as photosynthetic parameters such as the net photosynthetic rate, greatly improve the photosynthesis of tomato seedlings, and promote growth and development. DIECA treatment increases the stomatal conductance of tomato seedling leaves, increases the intercellular carbon dioxide content, thereby increasing the carbon fixation efficiency of the leaves, and increasing the net photosynthetic rate of the leaves; spraying DIECA promotes the accumulation of photosynthetic pigments, increases Fv / Fm, that is, increases the primary light energy conversion efficiency of photosystem II (PSII), thereby enhancing photosynthesis, and further improving the photosynthesis of the leaves.

The invention discloses a method and a system for estimating the mesophyll conductivity of a plant by utilizing sunlight-induced chlorophyll fluorescence, and relates to the technical field of plant physiological prediction. The method comprises the following steps: obtaining a plant mesophyll conductance prediction factor, taking the prediction factor as input, and outputting the plant mesophyll conductance based on a random forest model. Wherein the plant mesophyll conductivity predictive factor comprises a photosystem II reaction center opening ratio, a photosystem II maximum photochemical quantum efficiency, an atmospheric carbon dioxide concentration, a leaf temperature, a saturation vapor pressure difference and photosynthetically active radiation. According to the method, the qL is estimated by adopting the OC redox model, so that direct measurement of the qL in a complex experiment is avoided, and the application feasibility of the qL in global-scale ecological research is remarkably improved.

The invention provides an amaranthus retroflexus ArUGT75L6 gene, the nucleotide sequence of the amaranthus retroflexus ArUGT75L6 gene is as shown in SEQ ID NO: 1, and the coded amino acid sequence of the amaranthus retroflexus ArUGT75L6 gene is as shown in SEQ ID NO: 2. The invention also provides application of the gene. The amaranthus retroflexus ArUGT75L6 gene is used for metabolic detoxification light system II (PS) II inhibitor herbicides in plants. The relationship between the amaranthus retroflexus ArUGT75L6 gene and the photosystem II inhibitor herbicide resistance is disclosed for the first time, whether amaranthus retroflexus generates metabolic resistance to herbicides or not can be identified by detecting the expression quantity of the amaranthus retroflexus ArUGT75L6 gene, and the method has guiding significance on timely discovery of resistance, guidance of scientific pesticide application in farmland and alleviation of further spreading of pesticide resistance. The method has an important application prospect in detection and research of non-target resistance of amaranthus retroflexus to PS II inhibitor herbicides.

The invention relates to the technical field of bitter gourd high-temperature-resistant material screening, and particularly discloses a bitter gourd high-temperature-resistant material screening method which comprises the following steps: 1, establishing a multi-stage dynamic high-temperature stress system, and simulating natural high-temperature fluctuation and a subtropical day and night temperature difference environment in two stages of a bitter gourd seedling stage and a flowering stage to obtain a multi-stage dynamic high-temperature stress system; the defect that traditional constant-temperature stress cannot reflect the real heat resistance of the field is overcome; step 2, establishing an evaluation system for high-temperature-resistant screening of bitter gourds from field morphological damage (heat damage index and leaf withering rate), photosynthetic response (photosystem efficiency and net photosynthetic rate) in plants and oxidative stress (MDA content and SOD / CAT activity). According to the screening method of the bitter gourd high-temperature-resistant material, linkage molecular markers are developed on the basis of the precisely identified heat-resistant gene, early-stage rapid screening of the bitter gourd high-temperature-resistant material is achieved, the breeding efficiency is remarkably improved, and the breeding period is shortened.

This invention relates to the field of plant stress diagnosis technology, and more particularly to a modulated fluorescence imager that uses blue and green light to calculate the photochemical efficiency Φ of leaf photosystem I. PSI The method described in this invention utilizes a Mini-PAM chlorophyll fluorometer to measure blue and green light excitation in tomato leaves of both the test and control groups to generate fluorescence. Based on the measurement results, the photochemical efficiency Φ of photosystem I is calculated. PSI This allows for the diagnosis of the condition of the crop under test. The photochemical efficiency Φ of the photosystem I mentioned in this invention... PSI It is more sensitive to stress and is more effective in reflecting adverse stress. It is expected to be applied to the early diagnosis of stress in plants, so as to intervene in time and reduce losses.

The invention discloses a soybean GmHCF244 gene as well as an encoding protein and application thereof, and relates to the field of soybean gene engineering. The CDS sequence of the soybean GmHCF244 gene is as shown in SEQ ID NO: 1 in a sequence table. According to the application of the protein coded by the soybean GmHCF244 gene in the activity of the two reaction centers of the photosystem, the protein coded by the soybean GmHCF244 gene interacts with GmOHP1 and GmOHP2 to form a protein complex, and the activity of the two reaction centers of the photosystem is jointly regulated and controlled. The invention provides a GmHCF244 gene which is separated from soybeans and is used for coding high chlorophyll fluorescent 244 protein, and the protein coded by the gene can interact with GmOHP1 and GmOHP2 to form a protein complex which jointly influences the activity of two reaction centers of a light system.

Methods of engineering a photosynthetic bacteria or a plant to improve their photosynthetic efficacy by modifying a photosynthetic electron transport chain are disclosed herein. The method may comprise engineering the photosynthetic bacteria or the plant to overexpress a cyt b6f major protein or to express a synthetic construct of cyt b6f major protein linked to a photosystem protein. The engineered organisms exhibit increased growth as a result of increased photosynthetic efficiency. The disclosure also relates to methods of increasing biomanufacturing by the photosynthetic bacteria or plant, for example increased production of a biofuel, a biofertilizer, a nutraceutical, or a pharmaceutical.

Provided herein, in some embodiments, are engineered cells and use of the same for increased hydrogen production. In particular, provided herein are genetically engineered cells comprising a polynucleotide encoding a fusion protein comprising a photosystem I (PSI) protein and an algal hydrogenase, as well as methods for producing such genetically engineered cells. Also provided herein are methods for increasing hydrogen (H2) production in cells.

A genetically modified phototrophic cell for in-vivo production of hydrogen. The phototrophic cell has been genetically modified to the effect that a) at least one of the native photosystem I components has been deleted, b) the native hydrogenase has been deleted, and c) at least one fusion protein is expressed, comprising i. a hydrogenase or hydrogenase component and ii. at least one PSI component, with the proviso that the PSI is complemented by expression of the at least one fusion protein, and the hydrogenase component itself, or together with at least one further hydrogenase component expressibly introduced into the cell, has hydrogenase activity.

The present invention relates to a herbicidal composition comprising (A) a compound of Formula (I) or an agrochemically acceptable derivative e.g salt or ester thereof; and (B) at least one herbicide selected from the group consisting of: B1 an acetyl CoA Carboxylase (ACCase)-inhibiting herbicide; B2 an acetolactate synthase (ALS)-inhibiting herbicide; B3 an auxin mimic herbicide; B4 a photosystem-II (PS-II) inhibiting herbicide; B5 a hydroxyphenylpyruvate dioxygenase (HPPD)-inhibiting herbicide; B6 a very long chain fatty acid (VLCFA)-inhibiting herbicide; B7 a herbicide selected from the group consisting of beflubutamid (B7a), bixlozone (B7b), cinmethylin (B7c), diflufenican (B7d), icafolin (B7e), pendimethalin (B7f) and tetflupyrolimet (B7g). The present invention further relates to methods of controlling weeds comprising the herbicidal compositions of the invention.

The present invention relates to the field of plant biotechnology, and specifically to the application of the SlPsbW-LIKE gene in improving the high-temperature resistance and photosynthetic capacity of tomatoes. The present invention uses reverse genetics to first clarify the function of PsbW-LIKE in heat tolerance and photoprotection in tomatoes. It is very important for maintaining the stability of the photosystem II supercomplex. Therefore, increasing and supplementing the content of PsbW-LIKE under high-temperature stress is beneficial to improving the tolerance of plants such as tomatoes to high-temperature stress and is also beneficial to improving the photosynthetic capacity of plants in high-temperature environments. The heat tolerance mechanism of PsbW-LIKE discovered by the present invention is of great significance for improving the high-temperature tolerance and photosynthetic capacity of solanaceous crops such as tomatoes.

The invention discloses an algae photobioreactor reinforced by cooperation of sunlight and an artificial light source, and relates to the technical field of algae reaction, and the algae photobioreactor comprises a reactor main body which comprises an outer cavity and a reaction cavity arranged in the outer cavity; the light source system comprises a condensation system, a sunlight leading-in system, an artificial light source system and an SrYF5 fluorescent light-emitting system, and is used for providing illumination for the reactor main body; and the aeration system is communicated with the reaction cavity in the reactor main body, and gas generated by the aeration system is introduced into the reaction cavity. By combining the multispectral synergistic effect of the sunlight and the artificial light source, the SrYF5 nano fluorescent powder is utilized to realize light wavelength conversion, 320-400nm ultraviolet light is converted into 550-700nm red light, the available spectrum in the microalgae growth process is expanded, the photosynthesis efficiency of the microalgae is improved, and the overall efficiency of the algae photobiological reaction is improved.

The application discloses a kind of estimation methods of rice leaf function phenotype, comprising the following steps: first, based on the situation simulation of canopy radiation transfer model, the coupling relationship of the opening proportion q L With photosynthetically active radiation I is obtained;Second, based on the close mechanism of leaf chlorophyll fluorescence SIF and electron transport rate J, combined with the above coupling relationship, accurate estimation of rice leaf J is realized based on SIF observation;Finally, based on the principle of evolution optimality, combined with the mechanism of J and maximum carboxylation rate V cmax , the accurate estimation of rice leaf V cmax Is realized.Based on the coupling relationship of q L And I, relying on the mechanism of SIF and electron transport rate and maximum carboxylation rate, the accurate estimation of rice leaf function phenotype J and V cmax Is realized, and a new rice function phenotype estimation method is constructed.

The present invention relates to a mixture comprising dichloroclomazone and at least one herbicide selected from the group consisting of photosystem I electron diverting agents and agriculturally acceptable salts and esters thereof. The invention also relates to an agrochemical composition of the mixture and to a method of using the mixture or composition.

The present application relates to a kind of multi-environment regulation in situ real-time photosynthetic phenotyping system applied to the field of agricultural plant photosynthetic phenotyping, including environmental control system, photoelectric control system, image acquisition system, plant light system, computer, touch screen and plant sample cultivated in detection box, it is box type multi-environment regulation in situ real-time photosynthetic phenotyping system, realize the automatic regulation of experimental environmental factors, and in the experiment process, realize the in situ real-time monitoring and imaging of plant chlorophyll fluorescence parameters in box, improve the accuracy of chlorophyll fluorescence parameter detection, improve the efficiency of research work, and cooperate with adjusting band to realize the parallel of the detection angle of fluorescence imaging CCD camera and the leaf to be detected, guarantee the consistency of detection distance, cooperate with flattening unit, realize the flattening processing of warping part, guarantee the accuracy of detection result.