| CPC A01H 1/04 (2013.01) [A01H 6/604 (2018.05)] | 6 Claims |
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1. A method for breeding a new variety of Gossypium hirsutum, comprising the following steps:
a) crossing a medium-long-staple Acala cotton line and a variety Xiangmian No. 18 as parents to obtain reciprocal cross F1 combination seeds; then planting the reciprocal cross F1 combination seeds in Hainan, and performing composite crossing to obtain composite cross F1 seeds; in next 2 years, performing generation-adding planting of the composite cross F1 seeds once in Changde, Hunan in summer and in Sanya, Hainan in winter each year, for a total of 4 generations, to obtain F5 seeds; selecting from individual plants of the F5 seeds in Changde, for fiber length not less than 32 mm, and lint percent not less than 45%, to obtain a strain a);
b) mixing F2 of existing approved variety Xiangzamian No. 13 to obtain mixed F1 seeds, performing generation-adding planting on the mixed F1 seeds in Changde, Hunan in summer and in Sanya, Hainan in winter each year, for a total of 5 generations, to obtain F6 seeds, and selecting from the F6 generation for fiber length not less than 30 mm, lint percent not less than 38% per plant to obtain a strain b); and
c) crossing the strain a) and the strain b) as parents to obtain reciprocal cross F1 seeds, then performing composite crossing on the reciprocal cross F1 seeds to obtain composite cross F1 seeds, performing generation-adding planting in Changde, Hunan in summer and in Sanya, Hainan in winter each year, continuously adding generations,
and selecting individual plants from the F7 generation exhibiting a higher yield compared to variety Sikang No. 1, fiber length not less than 31 mm, and lint percent not less than 40%.
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