A Quantitative Method for Comparing the Heat Tolerance of Different Genotypes of Rice Germplasm at Grain Filling Stage

Abstract

The invention relates to the technical field of identification and evaluation of crop germplasm resources, and specifically discloses a quantification method for evaluating the heat resistance of rice germplasms of different genotypes at the filling stage, using the natural high temperature in the field to identify the heat resistance of different genotypes of rice germplasms at the filling stage The reliability and the comparability between the identification results of different years have good application prospects for screening heat-resistant rice germplasm at the filling stage and cultivating new rice varieties that are heat-resistant at the filling stage. The waste of resources due to repeated identification by different R&D units is of great significance.

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

Images