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【目的】阐明海岛棉枯萎病病情指数对产量性状的影响,为选育抗枯萎病高产海岛棉品种提供依据。【方法】采用加性-显性模型,对7个海岛棉品种(系)及其F1代17个组合病情指数和4个产量性状的资料,利用估算条件方差分量和预测条件遗传效应值的统计方法,分析苗期和花铃期枯萎病病指对4个产量性状的遗传影响。【结果】苗期病指对铃重有极显著的加性贡献(CRA=5%);花铃期病指对单株铃数有显著的加性贡献(CRA=100%);苗期病指和花铃期病指对铃数、铃重和皮棉产量均有极显著的显性贡献(贡献率为36%~53%)。病情指数对产量性状的加性效应贡献因亲本而不同;亲本V3、V4、V5单株铃数的加性效应达到了10%的显著水平,但两个时期病指对7个亲本单株铃数的加性贡献均为0.00,说明病指对单株铃数无显著影响;两期病指对亲本V2、V4、V6、V7的铃重具有正向极显著的加性贡献,对亲本V1、V3、V5的铃重具有负向极显著的加性贡献。两个时期的病指对多数组合的单株铃数、铃重、单株皮棉产量有正向极显著的显性贡献。【结论】海岛棉苗期和花铃期枯萎病病指对3个产量性状各遗传组分的贡献率大小存在较大差异,并且不同组合及其亲本两个时期的病指对产量性状不同遗传组分贡献的效应值因亲本和组合而异。
【Objective】 The objective of this study was to elucidate the effect of disease index on the yield traits of island cotton blight, and to provide basis for breeding high-yielding island cotton varieties resistant to blight. 【Method】 Based on the additive-dominance model, the data of seven combinations of disease index and four yield traits of seven island cotton cultivars (lines) and their F1 generation were calculated by using the statistics of the variance of estimated conditions and the genetic effect of predictive conditions Methods to analyze the genetic effects of Fusarium wilt disease at seedling stage and flower-boll stage on four yield traits. 【Result】 The disease index of seedling stage had a significant additive contribution (CRA = 5%) to the boll weight. The disease index at the flower-boll stage had a significant additive contribution (CRA = 100%) to the number of bolls per plant. Means and blossoming stages showed extremely significant dominant contribution to boll number, boll weight and lint yield (contribution rate 36% -53%). The additive effects of disease index on yield traits varied with the parents; the additive effect of the bolls of V3, V4 and V5 parents reached a significant level of 10%, but the disease index of two parents The additive contribution of the numbers was 0.00, indicating that the pathogen had no significant effect on the number of bolls per plant. The two disease indices had a positive and extremely significant additive contribution to the bolls weight of the parents V2, V4, V6 and V7. , V3, V5 bell weight has a significant additive negative contribution. The two stages of disease index for most combinations of bolls per plant, boll weight, single lint yield positive significant significant positive contribution. 【Conclusion】 There is a big difference in the contribution rate of Fusarium wilt disease to the genetic components of three yield traits at seedling stage and flower-boll stage, and the disease fingerprints of two combinations of different combinations and their parents have different genetic traits The contribution of component contributions varies by parent and group.