云南割手密及其血缘F_1代材料抗旱相关性状的主成分分析

Principal component analysis of drought resistance related traits of Saccharum spontaneum L. and its F_1 hybrids

本研究对15个云南不同生态型割手密血缘F1代创新种质材料及其亲系共28个材料,在自然生长与干旱胁迫条件下的生长发育状况密切相关的13个指标进行主成分与模糊聚类分析,综合评价参试材料的抗旱性。试验结果表明:(1)叶绿素因子、地下干物质积累因子和地上干物质积累因子等前6个主成分因子方差累计贡献率达90.11%,可代表原始指标的大部分信息量;(2)利用抗旱性度量值将参试材料聚为4大类6个亚类,聚入第Ⅰ类的共有4个创新种质材料,占参试材料的14.3%,尤其是云割F108-317、云割F108-319表现出较强的抗旱性;第Ⅱ、Ⅲ类材料分别占参试材料的42.9%、39.3%,都分为2个亚类,其中云割F108-392、云割F108-391、云割F108-511、云割F108-397、云割F108-617等5个创新种质材料,可在育种实践中优先利用;云割F108-541单独聚为第Ⅳ类,其抗旱性还有待进一步研究。

Principal component and cluster analysis were used for comprehensive evaluation on drought resistance related traits of 28 lines of S . spontaneum L ., including 15 F1 and their parents , under natural growth and drought stress .The results showed that the cumulative contribution of the first six components ,such as chlorophyll and dry matter of the underground and aboveground , to total variance of the population investigated reached 90 .11% , showing the largest variations .The test lines were divided into four clusters and six subgroups by clustering based on their drought-resistance value .Group Ⅰ included four tested materials ,accounting for 14 .3% of the total lines with YG F1 08-317 and YG F1 08-319 having the stronger drought resistance .Group Ⅱ and Ⅲ were divided into two subgroups ,accountings for 42 .9% and 39 .3% ,respectively .YG F108-392、YG F108-391、YG F108-511、YG F108-397 and YG F108-617 had practical value in breeding program .One lines of YG F108-541 belonged to Group Ⅳ .