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四川省棉花杂种优势利用协作组自1973年开始研究利用棉花“洞A”雄不育材料以来,经过几年的试验示范,取得了显著进展。实践证明,由于“洞A”雄不育系来源于推广良种,因此农艺性状和经济性状均较好,不育率稳定,适应性广,其不育性不受地理和气候条件的影响,而且适于作恢复系的品种广泛,有利于选配高优势组合,转育方便,从而提出了“两用系”(即将分离出的不育株作不育系,可育株作保持系)。通
Since its establishment in 1973, Sichuan Province Cotton Heterosis Utilization Collaboration Group has made remarkable progress after several years of experiment and demonstration using cotton “Cave A” male sterile materials. Practice has proved that, due to “hole A” male sterile derived from the promotion of good varieties, agronomic and economic traits are better, stable sterility, wide adaptability, its sterility is not affected by geographical and climatic conditions, and Suitable for the restoration of a wide range of varieties is conducive to the selection of high-performance combinations, easy to transfer, which proposed the “dual-purpose line” (about to be sterile lines for sterile lines, fertile lines for the maintainer). through