1 棉株不同果枝空间与节位结铃的种子遗传差异 1985年根据棉铃虫吐絮早晚,依次按照棉株下部、中部、上部果枝分三期收摘取样、测定。结果表明无论春播或夏播品种都因时空分布的不均匀性,表现为最早吐絮的下部铃虽然成熟较好,但因处于湿度较大的棉株下层,成铃后失水慢,常染菌霉变,种子质量不够稳定,而后期吐絮的上部棉铃,由于温光条件对棉铃生长发育的制约,成熟 1 cotton seedling branches of different fruiting branches and knot space node genetic differences in 1985, according to bollworm boll cotton boll sooner or later, followed by the lower part of the cotton plant, the middle and upper branches were taken in three samples collected and measured. The results showed that both the spring and summer sowing varieties were spatially and temporally inhomogeneous, the earliest boll-forming lower bell showed good maturity, but the lower bellows had lower water loss, Mildew, the quality of seeds is not stable enough, and the boll of the upper part of bollworm, due to temperature and light conditions on the growth and development of cotton constraints, mature