不同种植密度对三系杂交棉制种产量的影响

Effects of Planting Density on Seed Yield of Three Line Hybrid Cotton

适宜的母本种植密度是三系杂交制种高产的必要条件。为明确三系杂交制种获得高产的母本最佳种植密度,以转单价基因抗虫三系杂交棉邯杂301的母本邯750A为试验材料,设母本种植密度22 500、37 500、45 000、52 500和67 500株/hm2共5个处理,研究了不同母本种植密度对三系杂交棉叶片光合速率以及制种产量和产量性状的影响。结果表明：适宜三系杂交棉籽棉高产的母本种植密度为37 500~45 000株/hm2。该种植密度下,棉花叶片光合速率最高[19.3~19.6 mmol/（m2·s）],单株铃数（22.5~23.1个/株）和果枝数（13.0~13.2个/株）较多,单铃重（5.1~5.2 g）较大,最终籽棉产量达到了3 922.5~4 027.5 kg/hm2。

The suitable planting density of female parent is a necessary condition for hybrid seed production yield of three line, in order to make clear the optimum planting density of female parent for obtaining high yield of three line hybrid seed production. Taking transgenic Bt three line hybrid cotton Hanza 301 female Han 750A as test material, the effects of different planting densities （ 22 500, 37 500, 45 000, 52 500 and 67 500 plants/hm2 ） on cotton leaf photosynthetic rate, hybrid seed production yield and yield traits were studied. The results showed that the suitable planting density of female for high yield of three line hybrid cotton were 37 500-45 000 plants/hm2, under the density,the cotton with high leaf photosynthetic rate[19.3-19.6 mmol/ （ m2 · s ） ], the boll number per plant （ 22.5- 23.1 ） , the number of fruit branch per plant （ 13.0-13.2 ） , single boll weight （ 5.1-5.2 g ） were all higher, and the seed yield reached 3 922.5-4 027.5 kg/hm2.