陕西关中陆地棉抗倒伏性与植株性状的相关性研究

研究了陆地棉7种植株性状与抗倒伏性的相关性。结果表明,第1果枝高度、株高和每株大铃数与抗倒伏性呈正相关;伏前桃、铃期、铃重和黄萎病发病指数与抗倒伏性呈负相关。植株性状与抗倒伏性相关系数的绝对值为铃重>铃期>第一果枝高度>黄萎病指>株高>伏前桃>每株大铃数。第一果枝高度和黄萎病指与抗倒伏性的相关达0.05显著水平,铃重和铃期与抗倒伏性的相关达0.01极显著水平。通径分析表明可直接选择抗倒伏性的性状有株高、第一果枝高度、铃期、铃重和黄萎病指,其它性状不能直接选择抗倒伏性。在这7种性状中,对抗倒伏性选择效果最好的是第一果枝高度,其次为黄萎病指、铃重和铃期。

Study on Correlativity between Resistance to Lodging and Plant Characters in Upland Cotton in Guanzhong Shaanxi

The correlativity between resistance to lodging and the seven characters of plant in upland cotton were studied. The results showed that height of the first fruit branch, plant height and No. of big bolls appeared positive correlation with resistance to lodging; No. of bolls by July 15, stage of boll growth, boll weight and verticillium index appeared negative correlation with resistance to lodging. Absolute value of correlation coefficients between resistance to lodging and plant characters were boll weight> stage of boll growth>height of the first fruit branch> verticitllium index>plant height>No. of bools by July 15.>No. of big bools per plant. Height of the first branch and verticillium index were significantly correlated with resistance to lodging at 0.05 level, boll weight and stage of boll growth were significantly correlated with resistance to lodging at 0.01 level. The path analysis indicated that the traits could be selected directly for improving risistance to lodging were plant height, height of the first fruit branch, stage of boll growth, boll weight and verticitllium index, and others could not be. Among the seven traits,the best one for improving resistance to lodging was height of the first fruit branch, next were verticillium index, bool weight and stage of bool growth.