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利用棉花杂种优势是获得优质、高产、抗病的一条有效措施。杂种一代为杂合体,表现出很大的优势,由于杂种二代分离出纯合体和杂合体,杂种优势有所下降,但仍存在着优势,其优势有多大,能否利用,是个值得探讨的问题。在杂种优势利用过程中,存在着如何区别所配杂交组合,即后代种子优势大小的问题,田间鉴定至少需要1年的时间,若能从后代种子中测出其优势大小,就会大大加快杂种优势在生产上的推广应用。材料与方法测定杂种优势的组合有:冀棉4×中棉7、鲁棉1×中棉7、冀棉8×鲁棉1、鲁棉1×冀棉4、冀棉12×中棉12、冀棉4×中棉12、中棉12×中棉7、无腺体62—1×中7共8个组合的F_9种子。把
The use of cotton heterosis is to obtain high-quality, high yield, disease resistance is an effective measure. Heterozygous hybrids showed a great advantage. Heterosis decreased due to the separation of homozygous and heterozygous hybrids in the second generation of hybrids, but there are still some advantages. The advantages and disadvantages of hybrids are worth discussing. problem. In the process of utilization of heterosis, there is a problem of how to distinguish the advantages and disadvantages of the hybrid combination, that is, the seed size of the offspring. The field identification needs at least one year. If the superiority of the hybrid is measured from the offspring seed, the hybrid will be greatly accelerated Advantages in the promotion of the application of production. Materials and methods to determine heterosis combinations are: Ji cotton 4 × cotton 7, Luan cotton 1 × cotton 7, Hebei cotton 8 × Lumo 1, Liba cotton 1 × Hebei cotton 4, Hebei cotton 12 × cotton 12, Ji cotton 4 × cotton 12, cotton 12 × cotton 7, no gland 62-1 × 7 a total of 8 combinations of F_9 seeds. Put