Crossbreeding method for pyramiding cotton superior traits

Abstract

The invention relates to the field of cotton variety breeding, in particular to a crossbreeding method for pyramiding cotton superior traits. The method includes steps: taking a cotton variety authorized in Shandong Province which is a main cotton production region in the Yellow River basin as a female parent, taking two lines with fiber superior traits as male parents, and performing crossbreeding of the female parent with the male parents respectively to obtain a generation F1, wherein at least one of the male parents belongs to chromosome segment substitution lines from gossypium hirsutum and gossypium barbadense or recombinant inbred lines thereof; collecting pollens of stamens of generation F1 plants, mixing, performing pollination backcrossing on the generation F1 plants, and harvesting to obtain a double-cross generation F2; subjecting the generation F2 to continuous selfing for 3-10 times, and screening to obtain cotton superior traits pyramided line. By means of specific multi-parent double-cross pyramiding breeding, the character of high yield of the female parent is kept in the final generation, combining abilities of varieties are explored, pyramiding of superior traitsand certain lines is realized, a superior variety improving term is shortened, and genetic improvement efficiency is improved.

Description

technical field [0001] The invention relates to the field of cotton variety breeding, in particular to a breeding method for high-quality traits of hybridized and aggregated cotton. Background technique [0002] Cotton is an important economic crop in the world and occupies an important position in the economic development of the world and China. Cotton is not only an important fiber crop, but also an important oil crop, which plays a pivotal role in the national economy. Since the 1880s, improving cotton fiber yield traits has always been the most important goal in my country's cotton breeding, but the improvement of cotton fiber quality traits has not received enough attention; my country's cotton fiber quality is at the middle level in the world, and there are still fiber Unreasonable collocation of quality indicators, low fracture specific strength, 1-2cN / tex lower than the average in the United States, etc., cannot meet the needs of the rapid development of my country's...

AI Technical Summary

Problems solved by technology

However, the problem with the traditional breeding method is that in the process of crossing the parents, the male parent and the female parent are hybridized, usually a single male parent and a single female parent are selected. Without restrictions, it is difficult to breed excellent varieties with multiple excellent traits, and the efficiency of genetic improvement is low

[0018] These methods all involve the aggregation of high-yield traits of cotton. However, these methods involve many male parents, all of which are certified upland cotton, which belongs to the high-yield type, and the genetics are relatively narrow. Moreover, the ability to aggregate good traits needs to be further improved.

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