Method for rapidly breeding whole-growth-period salt-tolerant rice

Abstract

The invention discloses a method for rapidly breeding whole-growth-period salt-tolerant rice, and belongs to the technical field of crop breeding. The method comprises the following steps: by taking high-quality conventional medium-maturing late indica variety, namely Yunnan Indica variety, as a female parent and FL478 as a male parent, selfing a hybridized F1 generation, harvesting seeds F2-F3 generations, performing natural condition screening on the harvested seeds F2-F3 generations in a Yunnan coastal mud flat region, performing seedling stage screening on the F4 generations by using a high-concentration saline solution in a laboratory, performing whole-growth-period salt tolerance screening on the F5-F6 generations by increasing screening pressure, and performing selection in combination with a molecular marker RM3412 at the same time; selfing for a first generation, and selecting a rice line with 1-3 levels of salt tolerance, agronomic traits similar to those of conventional breeding, disease resistance similar to that of FL478 and quality similar to that of jade needle fragrance. According to the method, the whole-growth-period salt-tolerant new rice variety is rapidly cultivated through a means of combining natural conditions and laboratories, and the method has great significance in improving the utilization rate and economic benefits of saline-alkali land in China and relieving the global food crisis.

Description

technical field [0001] The invention belongs to the technical field of rice breeding, and in particular relates to a breeding method for rapid selection and breeding of salt-tolerant rice in the whole growth period. Background technique [0002] Rice is one of the most important food crops in the world. It is sensitive to salt damage. When the soluble salt concentration in the soil reaches 0.3%, it will show symptoms of damage, which will eventually lead to a significant reduction in yield. The world's saline-alkali land area accounts for about 1 / 3 of the land area, accounting for 20% of the world's total cultivated land area. The area of ​​saline-alkali land in China is about 20 million hm 2 . Due to the impact of many factors such as human activities, soil salinization is constantly devouring the land on which human beings live, and the area of ​​land available for cultivation is decreasing day by day. From the perspective of water resources, climate and ecology in my c...

AI Technical Summary

Problems solved by technology

In the prior art, the natural salt field is used for natural screening, and at the same time, the donor parent FL478 containing the salt-tolerant QTL-saltol is selected using laboratory molecular markers, and the low-generation F 1 Since the beginning of continuous salt tolerance screening, there are almost no reports on the breeding of salt-tolerant rice varieties.

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