Asexual propagation method of gossypii nuclear sterile dual-purpose line, restoring line and ordinary line by using biennial root

Abstract

The invention discloses an asexual propagation method for nuclear male sterile line, restores line and common line in cotton by utilizing perennial root. The course of action is that: planting cottonof nuclear male sterile line, restores line and common line in the area that the cotton is capable of living through the winter for the first year and reserving the cotton plant to pass the winter naturally after harvested the seeds; then in the second year or each year later, the cotton plant with perennial root of the previous year gives off lateral bud and grows out new plantlet by the asexualpropagation. Harvesting seeds on the plantlet features asexual propagation to realize the asexual propagation for the parents of cotton nuclear coenospecies and cotton line under the conditions of perennial root of high purity strain, so as to maintain the reliability of netic gene and reduce the gene recombination and genovariation due to sexual multiplication; meanwhile, in cooperation with species pollinated by insects during propagating sterile line, the invention can both maintain the hereditary purity and lower the production cost.

Description

[0001] Field [0002] The invention relates to a method for asexual reproduction of cotton genital sterile dual-purpose lines, restorer lines and common lines by using perennial roots. Background technique [0003] Cotton is a frequent outcrossing crop, and the outcrossing rate is generally 3-10%, and it can be as high as 50% when there are many pollinators. In addition, both parents of the currently selected hybrid combinations have a certain degree of gene heterozygosity. Even if the Shuanhua selfing is completely isolated, the offspring and parents will mutate due to gene recombination. [0004] In the process of breeding parents, people always follow the method of selecting the superior and eliminating the inferior. After several years of complete isolation and breeding, the parents may be homozygous or better than when the combination is selected. However, due to the change of the parents, the combination The special combining ability of heterosis will also change accord...

AI Technical Summary

Problems solved by technology

[0005] Therefore, after a breeder selects an excellent hybrid combination or an excellent common cotton line, after several years of experiments and demonstrations, when it is really expanded and popularized, the hybrids after the double-parent combination or the ordinary high-quality cotton lines introduced are the same as the original high-quality cotton lines. Experiments have changed, some have changed beyond recognition, because breeders can't fully preserve the parents or common lines when they are selected for success