Breeding method for high-quality characters of hybrid cotton

Abstract

The present invention relates to the field of cotton variety cultivation, in particular, to a breeding method for high-quality traits of hybridized and aggregated cotton, comprising the following steps: using a cotton variety approved by Shandong Province, the main cotton-producing area in the Yellow River Basin, as the female parent, and two fiber high-quality traits The strain of is used as the male parent, wherein at least one of the male parents is a land-sea introgression line or its recombinant inbred line, and the female parent is crossed with the male parent respectively to obtain the F1 generation; the pollen of the stamens of the F1 generation plants is collected and mixed, and then The F1 generation plants are pollinated and transgenic, and the F2 generation of double cross polymerization is obtained by harvesting; the F2 generation is continuously selfed for 3-10 times, and the lines with high-quality traits of the polymerized cotton are obtained by screening. The present invention adopts specific multi-parent double-cross aggregation breeding, retains the high-yield characteristics of the female parent in the progeny, excavates the combining ability between varieties, aggregates high-quality traits and certain strains, shortens the improvement period of high-quality varieties, and improves genetic improvement efficiency.

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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