The Development And Combination Screening Of Cytoplasmic Male Sterile And Restorer Lines Of Upland Cotton (Gossypium Hirsutum L.)

The development and growing of hybrid cotton on a huge area raised the yields, quality and stress resistance on a significant amplitude with extremely prominent economic and social effects. However, the confinement of the methods for producing hybrid seeds inhibited the hybrid cotton of our country from being propagated and utilized on a large scale. In this research more than 20 high yielding, excellent quality and disease resistant Upland cotton varieties (strains) were utilized to cross and back cross with Gharknessii, 104-7A cytoplasmic male sterile and restorer lines, more than twenty novel cytoplasmic male sterile lines as well as ten or so new restorer lines were developed.For inspecting the utilization value of the cytoplasmic male sterile line and restorer lines after being transferred, analytical evaluations were conducted on the respect of combining ability of the male sterile lines. The economic traits, restoring ability and combining ability of the restorer lines were analyzed and assessed . Meanwhile tentative combination tests were initiated on a wide sphere and the possible heterosis on F1 were widely inspected on three respects, combining ability, character performance and heterosis. In synchronization with selecting high heterosis, test of pollen transferring with bees, were conducted. The results indicated that:1. The male sterile lines transferred belong to pollenless type with stable male sterility. It was indicated by the analysis of male sterile line combining ability, the same parent may differ tremendously on the general combing ability among different characters; From the point of view of specific combining ability variance, the differences among different characters were also similarly very large. Partial materials may be with relatively high application value.2. The fertilities of three restorer lines Summian 12R, Simian3R and Sumian9R were very approximate to that of the check variety, while the economic characters were similar to those of the recurrent parent.