A screening and identification method for high temperature resistant cotton

Abstract

A high-temperature resistant cotton screening and identification method is used for screening and identification of high-temperature resistant cotton germplasm resource materials and varieties. Cotton materials are planted in the field by nutrition bowl seedling transplantation or direct seeding; mepiquat chloride at a concentration of 80-100 mg / L is used for processing when a main stem leaf grows 10-12 true leaves; after processing, fixed plants' height during 18-20d is measured and main stem internode length is limited; and according to average growth rate of plant height and average limited main stem internode length, the materials to be measured are divided into two types, namely a high-temperature resistant type and a high-temperature sensitive type. According to the high-temperature resistant cotton screening and identification method, no greenhouse facilities are needed to provide high temperature stress. By the method, costs are saved. The method is simple to operate, has advantages of standard and visual evaluation and reliable result, can provide rapid identification in early stage, and has important application value in the aspect of high-temperature resistant cotton breeding and production.

Description

technical field [0001] The invention relates to a method for screening and identification of high-temperature-resistant cotton, which is specially used for screening and identification of high-temperature-resistant cotton germplasm resource materials and varieties, and belongs to the field of stress-resistant breeding of crops. Background technique [0002] Global warming has become a consensus. It is predicted that by the second half of this century, the average global temperature will rise by 1.4-5.8°C, and extreme climates such as high temperature and drought will occur more frequently. The average annual temperature increase in my country is slightly higher than global warming by 0.5-0.8°C, and the probability of extreme high temperatures in the future summer (June to August) is as high as 90% (Battisti D Sand Naylor R L. Historical Warnings of Future Food Insecurity with Unprecedented Seasonal Heat. Science, 2009, 323:240-244). At present, seasonal high temperatures ex...

AI Technical Summary

Problems solved by technology

This method needs to build a simple high-temperature shed for artificial high-temperature stress treatment at the initial flowering stage of cotton. The high-temperature treatment is not easy to control and is easily affected by changes in natural environment temperature and other conditions. Moreover, the pollen germination test is not rigorous enough, and the judgment standard is vague.

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