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 cotton of 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 asexual propagation. 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 clonal propagation technique of cotton parents and strains. Background technique [0003] Cotton is a frequently outcrossing crop. Under normal circumstances, the outcrossing rate is 3-10%, and it can be as high as 50% when there are many pollinators. In addition, the parents of the currently selected hybrid combinations have a certain genetic heterozygosity. Even if the shamrocks are completely selfed, their offspring and parents will mutate due to genetic recombination. [0004] In the process of breeding parents, people always follow the method of selecting the superior and the inferior. If they are reproduced in complete isolation for several years, their parents may be homozygous or better than the combination selection. However, due to changes in the parents, the combination The special combining ability of hybrid vigor also changes accordingly; if the parents reproduce in incomplete isolation for several years, the parents wil...

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