Method for identifying heat-resistant seed setting performance of early rice at earing and flowering stages based on hour cumulative temperature

A technology of heading and flowering stage and time-accumulated temperature, which is applied in the field of heat resistance identification, evaluation and breeding of variety materials, can solve the problems of large deviation of heat resistance identification results and no consideration of synergistic effects, etc., and achieves obvious differences in fruiting and control , easy to control, simple operation effect

Inactive Publication Date: 2016-05-11
广西壮族自治区农业科学院水稻研究所
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Problems solved by technology

Previous studies used different heat damage temperature thresholds and stress durations, and did not consider the synergistic effect of the two, as well a

Method used

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  • Method for identifying heat-resistant seed setting performance of early rice at earing and flowering stages based on hour cumulative temperature
  • Method for identifying heat-resistant seed setting performance of early rice at earing and flowering stages based on hour cumulative temperature
  • Method for identifying heat-resistant seed setting performance of early rice at earing and flowering stages based on hour cumulative temperature

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[0031] Example

[0032] Appraisal of Heat Tolerance of Some Early Rice Varieties in Guangxi

[0033] 1) Sowing and raising seedlings: sow all the materials of early rice varieties to be identified on the same day. Three materials were used for the test: two-line indica hybrid rice Guiliangyou No. Recognized heat-tolerant variety indica conventional rice N22; time is March 1;

[0034] 2) Pot preparation for transplanting: Early rice (March-July) was carried out at the Rice Research Institute of Guangxi Academy of Agricultural Sciences (22°51′N, 108°14′E), and medium-fertile paddy soil was used for potting; the inner diameter 30cm, 30cm high plastic pots for potting, soil collected from paddy fields (organic matter 27.2g / kg, total nitrogen 2.1g / kg, alkaline nitrogen 85mg / kg, available phosphorus 30mg / kg, available potassium 73mg / kg), after drying After dry crushing and sieving, the dosage per pot is 10kg, and 10g of urea is applied per pot (applied three times as base fertiliz...

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Abstract

The invention relates to the technical field of agriculture and particularly relates to a method for identifying heat-resistant seed setting performance of early rice at earing and flowering stages based on hour cumulative temperature. The method comprises the specific processes of labeling big ears about to be eared at the earing and flowering stages of the early rice, carrying out treatment for 6 hours at the constant stressing temperature of 38 DEG C at the time interval of 9: 30a.m. to 15:30p.m. every day, carrying out continuous treatment for 2 to 3 days, placing the early rice under natural conditions below the temperature of 32 DEG C and above the temperature of 25 DEG C at other time intervals, taking seed setting percentage under the natural conditions as a control, and adopting relative seed setting percentage as an index of the heat-resistant seed setting performance, thereby being capable of accurately and effectively identifying and distinguishing the heat resistance difference among early-rice variety materials. The method has the beneficial effects that by adopting the constant stressing temperature of 38 DEG C, the temperature of glumous flower tissue is about 36.2 DEG C and is slightly higher than thermal-damage critical temperature, i.e., the daily maximum temperature 35 DEG C of the earing and flowering stages of rice, so that the obtained seed setting performance of stress treatment is of obvious difference from that of the control and is in line with disaster damage performance of local short-time high temperature. The method is applicable to the identification on a large number of heat-resistant variety materials.

Description

【Technical field】 [0001] The invention relates to the field of crop planting, in particular to a method for identifying the heat resistance and firmness of early rice at the heading and flowering stage based on the time-accumulated temperature, which can accurately and effectively identify and distinguish the difference in heat resistance between early rice variety materials, and is used for identification and evaluation of heat resistance of variety materials. breeding. 【Background technique】 [0002] With global warming, the frequency of short-term extreme high temperature weather in local areas will further increase, and the rice yield reduction caused by high temperature disasters has become increasingly serious, which has become one of the main limiting factors for high and stable rice yields. In recent years, in Hubei, Hunan, Anhui, Jiangxi, Sichuan, Chongqing, Jiangsu, Zhejiang and other provinces and cities in my country's main rice production areas, the high tempera...

Claims

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Application Information

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IPC IPC(8): A01G16/00A01G22/22
CPCA01G22/22
Inventor 梁天锋王强张晓丽唐茂艳陈雷吕荣华陶伟
Owner 广西壮族自治区农业科学院水稻研究所
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