短季棉早熟性产量和纤维品质的主成份和典型相关分析

PRINCIAL COMPONENT ANALYSIS AND CANONICAL CORREALTION ANALYSIS OF EARLINESS,YIELD-CONTRIBUTING CHARACTERS AND FIBRE QUALITY OF SHORT-SEASON COTTON

对不同生态型短季棉早熟性的主成份分析和４组性状间的典型相关分析表明，短季棉早熟性主成份Ⅰ，Ⅱ的累积贡献率达９１．６６％。短季棉早熟性与生态因子的典型相关极显著，二者主要由生育期和出苗至吐絮期的有效积温起作用。短季棉产量性状与早熟性状、纤维品质的典型相关均达极显著和显著水平，但早熟性和纤维品质的典型相关不显著。短季棉育种要协调和同步提高早熟性、丰产性与纤维品质，应重点选择第１，２次收获皮棉产量及其比率和生产率指数，同时防止麦克隆值过大及株高过低。

Principal componenet analysis of earliness and canonical corelation analysis of 4character groups were made of short-season cotton genotypes of different ecotypes.Theprimary characters controlling earliness of short-season cotton were found to be principal I,which falls into the category of biological earliness factors, and principal Ⅱ,whichcovers the'yield-effect earliness factors'.Their accumulated variance contribution is ashigh as 91.66%.The canonical correlation between earliness and ecological factors ishighly significant.They are mainly decided by growth duration and the effective eccumu-lated temperature in this period.The canonical correlation is highly significant betweenyield-contributing chracters and earliness and significant between yield-contributing char-acters and fibre quality,but is not significant between earliness and fibre quality.To im-prove earliness,lint yield and fibre quality simultaneously, focus in selection is to beplaced on the lint yield of the lst and 2nd harvests,lint percentage and productivity index.It should be avoided to seek excessively high micronaire value and excessively low plantheight.