论文部分内容阅读
改进陆地棉纤维强度是目前北方棉区棉花育种工作的迫切任务。其改进方法一是将海岛棉强纤维基因转育到陆地棉,但由于变异大,分离世代长,需要较长时间才能完成。二是用具有野生棉种质的陆地棉强纤维品种改进当地推广品种。后一途径的主要困难在于强纤维特性与高皮棉产量间有负相关,使高产与强纤维不易结合(Al-Jibouri 等1958,Miller 和Rawling 1967,Meredith 和 Bridge 1971)。克服这种困难的第一种方法是用群体内互交,以打破这种不利的连锁,在 F_1、F_2、F_3代把互交与选择结合,可使皮棉产量与成纱强度的相关系数由-0.93变为0.45,出现不少高产与强纤维结合的选系(culp 等1979)。第二种
Improving cotton fiber strength in Upland cotton is an urgent task for cotton breeding in the northern cotton area. One of the improved methods is to transform the island cotton fiber to Upland cotton, but due to the large variation and the long separation from generation to generation, it takes a long time to complete. Second, the use of wild cotton germplasm varieties of land-based cotton fiber to promote the promotion of local varieties. A major difficulty with the latter approach is that there is a negative correlation between strong fiber properties and high lint yield, making high yield incompatible with strong fibers (Al-Jibouri et al 1958, Miller and Rawling 1967, Meredith and Bridge 1971). The first way to overcome this difficulty is to cross each other in groups to break this unfavorable chain. The combination of reciprocal selection and selection on F_1, F_2 and F_3 generations can make the correlation coefficient between lint yield and yarn strength -0.93 to 0.45, there are many high yield and strong fiber combination of lines (culp et al 1979). The second one