A method for identification of heat-resistant rice and its application in breeding

Abstract

The invention relates to a crop identification method and in particular relates to a method for identifying high-temperature-resistant rice. The method comprises the following steps: seeding to-be-identified rice varieties and high-temperature-resistant control varieties at each phase, seeding and raising rice seedlings in phases, and planting in a large field; judging that the to-be-identified varieties have weak tolerance on high temperature if a bigger fluctuation occurs at the initial heading stage, the full heading stage and the maturation stage of each variety in each phase, otherwise selecting a judgment method according to whether encountering extreme high-temperature weather; if all the varieties have initial heading in any phase during the extreme high-temperature weather, selecting 20 available spikes during the initial heading on that day in the phase of each variety encountering the extreme high-temperature weather, testing the seeds when the rice basically has yellow ripeness, and evaluating according to the setting percentage and comparison with control; selecting five roots of available spikes in each seeding period of each variety for performing indoor seed testing if not encountering the extreme weather; recording the maximum value, the minimum value and the mean value, and evaluating by taking the values as the basis. The method for identifying high-temperature-resistant rice disclosed by the invention scientifically selects an evaluation criterion and is suitable for high-temperature-resistant identification of lots of varieties.

Description

technical field [0001] The invention relates to a crop identification method, in particular to an identification method of high temperature resistant rice and its application in breeding. Background technique [0002] Rice is one of the most important food crops in China, but with the improvement of production conditions and the increase of production level, climatic factors, especially high temperature, have more and more influence on rice production. Previous studies have shown that high temperature damage to rice mainly occurs during the flowering period. High temperatures above 35°C can cause stunted flower organ development and pollination behavior disorders, including hindering anther cracking, pollen germination, and pollen tube elongation, resulting in a significant reduction in seed setting rate and a substantial reduction in rice yield. . Abnormal high temperature frequently endangers rice fruiting, which has aroused the attention of all parties. Faced with the u...

AI Technical Summary

Problems solved by technology

However, the traditional staged sowing in the field is under completely natural conditions, and the high-temperature weather conditions required for the test are often difficult to meet, or there is no high-temperature weather in the current season, or the high-temperature weather does not coincide with the heading and flowering period of the test variety, and the identification results are often not obtained.

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