Quantification method for evaluating heat resistance of different genotypes of rice germplasms in filling period

Abstract

The invention relates to the technical field of crop germplasm resource identification and evaluation, and particularly discloses a quantification method for evaluating the heat resistance of different genotypes of rice germplasms in a filling period. The reliability of identifying the heat resistance of the different genotypes of rice germplasms in the filling period by the natural high temperature of a field and the comparability between identification results in different years are utilized. The method has a good application prospect in screening the rice germplasms with the heat resistancein the filling period and cultivating a new rice variety with the heat resistance in the filling period, and is of great significance in improving the rice heat resistance breeding effect and reducing resource waste caused by repeated identification of different research and development units.

Description

technical field [0001] The invention relates to the technical field of identification and evaluation of crop germplasm resources, and specifically discloses a quantitative method for evaluating the heat resistance of different genotypes of rice germplasm at the filling stage. Background technique [0002] Global warming, especially the frequent high temperature in summer, will harm the yield and quality of rice and other crops. In my country, the harm of high temperature and heat damage to rice production mainly occurs in the double-cropping rice area south of the Yangtze River Basin, which is also the main rice producing area in my country. Usually, during the first and middle days of July every year, the sub-high pressure ridges controlling these areas are in a stagnant state, so these areas often maintain high temperature weather for several days or even ten days after the first and middle days of July, and the middle and late July happens to be The grain filling period ...

AI Technical Summary

Problems solved by technology

[0003] The breeding of new high-temperature insensitive rice varieties must first excavate rice germplasm resources with good heat tolerance at the filling stage. It is difficult to ensure that different genotypes of rice enter the grain-filling period at the same time, resulting in different degrees of high-temperature stress encountered by different genotypes of rice during the grain-filling process, which eventually leads to distortion of the identification results of heat tolerance of rice germplasm; Variation in air temperature leading to lack of comparability between heat tolerance results identified in different years

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