A method for identification of low-temperature-tolerant double-cropping late rice at the earing stage and its application in breeding

Abstract

The invention relates to crop identification methods, in particular to an identification method of ear-period-low-temperature-resistant double-cropping late rice. The identification method is characterized in that to-be-identified paddy rice varieties and low-temperature-resistant control varieties are sown in each stage, if the initial heading period, full heading stage and mature stage of the varieties in each stage have large fluctuation or the final 1-2 stages of the varieties cannot have normal heading and maturity, the low temperature resistance of the to-be-identified paddy rice varieties is weak, or else, a judgement method is selected according to whether the varieties encounter with extreme low-temperature weather; if all the varieties have optional one stage having initial heading during the extreme low-temperature weather, 10 effective ears of the initial heading of the very day of the stage, encountering with the extreme low-temperature weather, of each variety are selected and evaluated according to fruiting rate and comparison with the control varieties; if the varieties do not encounter with the extreme low-temperature weather, 5 effective ears of each sowing stage of each variety are selected to perform plant laboratory test, and maximum values, minimum values and average values are recorded and used for evaluation. The identification method has the advantages that evaluation standards are selected scientifically, and the method is suitable for identifying a large amount of low-temperature-resistant varieties.

Description

technical field [0001] The invention relates to a crop identification method, in particular to an identification method of low temperature resistant double-cropping late rice at the earing stage and its application in breeding. Background technique [0002] More than 15 million hectares of rice in the world are threatened by low temperature, and there are 24 countries that have serious low temperature damage to rice, especially in Japan, North Korea and China's Dongdao area. In China, rice production is reduced by 3 to 5 billion kilograms every year due to low temperature and chilling damage. Chilling injury is the main climatic factor affecting rice yield, which occurs frequently and has a certain mass and periodicity, and has become an important reason for the instability of rice production. Rice is a plant that originated in the tropics, and its temperature-loving is an inherent genetic characteristic. Due to the different genetic backgrounds of different varieties, the...

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Problems solved by technology

However, the traditional staged sowing in the field is under completely natural conditions, and the low temperature weather conditions required for the test are often difficult to meet, or there is no low temperature weather in the current season, or the low 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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