Abstract: Phenotype and microscopic observation,classical self hybridyzation and sib-cross means were applied to analyze the flower phenotypic characteristics,genetic model,and the allelism for Yu 98-8A line cotton genic male sterile line bred from the offspring population of a genetically modified cotton population. Floral morphology investi-gation showed that,the length of style and exposed style of sterile plants were significantly higher than that of homoge -neity fertile plants,filaments shriveled markedly,and there was no pollen within the anther of sterile plants,while the diameter of ovary and the number of anthers of each flower had no significant difference. Genetic analysis of hybrid offspring population of sterile and heterozygous fertile plants and the self -cross of fertile heterozygous plants showed that the male sterility was controlled by a single recessive gene. Allelic detection analysis implied that the male sterile gene of Yu 98-8A was different from ms14,ms2 and ms15.Analysis of hybrid offspring population of Yu 98-8A and conventional cultivars showed that not only both of the general and specific combining abilities were higher,but also the lint percentage and fiber quality were better,all of which suggested a better application prospect.

Key words: Upland cotton, Recessive genic sterile, Flower characteristics, Breeding, Genetic analysis

CLC Number: 

• S562