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Cotton "hole A" nuclear male sterile germplasm
In 1972, the male sterile cotton strains found in Daejeon were successfully cultivated with cotton "hole A" nuclear male sterile germplasm after three years and six quarters of research. Its infertility traits are mainly controlled by a pair of recessive nuclear genes. Sterility is genetically stable, easy to be transferred, with strong combining ability, extensive restoration system, about 50% sterile group rate, and 100% sterility per plant. Good productivity, wide adaptability and other characteristics. Using the hole A nuclear male sterile germplasm, one of the derived sterile lines was transferred. Several of the derivates of sterile lines were also paired and screened for 12 validated hybrids. Research has succeeded in two-line legal production. And proposed a small number of flower workers, low-cost breeding. Seed production technology, using the derived male sterile line of the hole A nuclear male sterile germplasm, hybrid selection and hybrid breeding, steadily expanding the area used for production since the 1980s, and expanding the scope of application from Sichuan to Hubei, Jiangsu, Shandong, and Henan In Shaanxi and Shaanxi Provinces, as of 1995, incomplete statistics were obtained, with a total of 610,000 hectares being promoted, increasing 150 kg of lint per hectare, creating an increase in production value of 962 million yuan, and cotton “hole A†nuclear male sterile germplasm, both at home and abroad. China is unprecedented in its use of "hole A" male sterile germplasm breeding to derive sterile lines, crossbreeding and selection of hybrids and their complementary application technologies, for the first time in China for large-scale production, and achieved great social and economic Benefits have opened up a new technological approach for cotton heterosis utilization.