Method for producing seeds of triple cross cotton

Abstract

The invention relates to a method for producing seeds of triple cross cotton. The method comprises the following steps of: cultivating a sterile line of zero type and I type fruit branches, namely hybridizing an upland cotton sterile line with a sea land mixed variety maintaining line to cultivate the sterile line of the zero type and I type fruit branches, namely the female parent; cultivating a restoring line, namely hybridizing an upland cotton variety restoring line with a sea land mixed variety to cultivate a sea land mixed restoring line, namely the male parent; and producing the seeds, namely hybridizing the sterile line of the zero type and I type fruit branches serving as the female parent with the sea land mixed restoring line serving as the male parent to produce the triple cross seeds. By the method, the seed production time is shortened from 40 days to 7 to 10 days; and the yield of the prepared hybrid seeds is increased by 20 percent compared with that of the conventional seeds. The sterility and the sterile strain ratio of the sterile line reach 100 percent; the restoring degree of the hybrid seeds reaches over 95 percent; and the restoring strain ratio reaches 100 percent. The prepared hybrid cotton seeds maintain the advantages of the upland cotton and the high greensickness resistance characteristic of sea island cotton.

Description

technical field [0001] The invention relates to the field of agricultural technology, in particular to a seed production method of three-line hybrid cotton. Background technique [0002] Traditional cotton hybrid seed production needs to remove the female stamens of cotton, and then collect pollen from the male parent for artificial pollination. Although the produced hybrid generation has an advantage in yield, this method requires a lot of labor, takes a long time for seed production, and the purity is not easy to guarantee. Cotton three-line seed production technology, that is, three-line sterile line, restorer line, and maintainer line matching seed production technology was first researched in the United States. Researchers used the sterile line with Hacksini cotton cytoplasm, which also has the ability to restore sterility. Competent restorer lines were crossed to produce hybrid cotton seeds. However, due to the relatively poor recovery ability of the recovery system,...

AI Technical Summary

Problems solved by technology

However, the current three-line hybrid cotton still has problems such as high seed production costs, and the increase in yield of the first generation of cotton hybrids is not as good as that of two-line hybrids.