摘要
为有效评价和利用十倍体割手密资源,挖掘其优异性状,选取中国6个省9个地区的171份十倍体割手密资源,针对8个质量性状指标和8个数量性状指标,对其多样性指数、变异系数、数量性状间的相关性、数量性状与纬度和海拔的相关性进行研究。表型相关性分析结果表明:十倍体割手密资源质量性状的Shannon–Wiener多样性指数整体偏低,采自滇中地区的多样性指数(0.636 6)最高,而采自滇西北地区的多样性指数(0.335 8)最低;数量性状的遗传变异较丰富,变异系数最大的为滇西南地区的资源(33.06%),最小的为贵州的资源(22.12%);产量性状与海拔和纬度呈负相关,糖分性状与海拔呈负相关,与纬度呈正相关,纤维分仅与海拔呈正相关;产量性状之间和糖分性状之间均呈正相关。遗传结构分析结果表明:表型性状的遗传变异主要来自于采集地区内部,采集地区之间有明显的基因交流(基因流值Nm>3),遗传分化不明显。聚类分析结果表明:表型性状与采集地的地势有一定关系,高地势的滇东北地区和滇西北地区聚为一个小类群,低地势的滇东南、滇西南、川东南、广东地区聚为一个大类群。
In order to utilize and estimate efficiently the decaploid accessions of Saccharum spontaneum L. and to develop the elite traits, genetic diversity index, correlation coefficient of variance, correlation among quantitative traits, and correlation between quantitative traits and altitude or latitude were evaluated based on eight qualitative traits and eight quantitative traits of 171 decaploid accessions of S. spontaneum collected from 9 regions of 6 provinces in China. The results showed that the Shannon-Wiener genetic diversity index of qualitative traits was generally low. The accessions from middle part of Yunnan exhibited the highest genetic diversity index（0.636 6）, while those from the northwest showed the lowest（0.335 8）. There were high genetic variances in quantitative traits, accessions from southwest of Yunnan showed the highest variance value （33.06%） and those from Guizhou showed the lowest（22.12%）. Yield related traits exhibited negative correlations with elevation or latitude, sugar related traits showed negative correlations with elevation and positive correlations with latitude. Fiber was only positively related to elevation and there were positive correlations among yield related traits and among sugar related traits. Analysis of genetic structure indicated that the genetic variances of phenotypic traits derived mainly from inner sampling regions. The big gene flow（Nm〉3） among populations from different sampling regions suggested no significant genetic divergence among these populations. According to genetic distance and UPGMA, phenotypic traits of decaploid accessions of S. spontaneum were related to the terrain of the sampling region to some degree. The accessions from northeast and northwest of Yunnan with high terrain were clustered into a small group, and the accessions from regions with low terrain as southeast and southwest of Yunnan, southeast regions of Sichuan and Guangdong were clustered into a big group.
出处
《湖南农业大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第6期574-579,共6页
Journal of Hunan Agricultural University(Natural Sciences)
基金
云南省自然科学基金项目(2011FB120)
关键词
割手密
十倍体
表型性状
遗传多样性
Saccharum spontaneum L.
decaploid
phenotypic trait
genetic diversity
