摘要
以来自8省区38个披碱草属野生居群的22个表型性状为调查对象,利用变异系数及多样性指数法对性状内和性状间及种间的表型变异进行分析,并对表型性状与地理气象因子间的关系进行相关性分析,用平均聚类法对38个居群进行分类,以揭示不同来源披碱草属种质资源表型多样性。结果显示:(1)营养器官性状中旗叶至穗基部长变异系数最高(44.695%),穗部性状中的每穗小穗数变异系数最高(77.005%)。(2)披碱草、麦宾草、圆柱披碱草与老芒麦这4个种间总体平均多样性指数为0.920~1.560,披碱草最高,麦宾草次之,圆柱披碱草最低。(3)表型性状变异受海拔、经度及年均温的影响较大。(4)UPGMA聚类结果将所有材料分成4组,披碱草属植物性状的表型特征没有严格按地理距离而聚类。研究表明,披碱草属植物野生种质材料具有丰富的表型多样性,表型性状与环境之间关系密切,采集过程中应尽量保持居群的完整性,最大程度地保护中国披碱草属牧草的遗传多样性。
In order co reveal the phenotypic diversity of different Elymus germplasm,we investlgatect twen ty-two phenotypic traits of thirty-eight populations from eight provinces. Phenotypic variation between and within the populations of Elyrnus was analyzed by the coefficient of variation and diversity index analysis methods, and the pattern of variation morphological traits and geographical factors were analyzed by correlation analysis. The thirty-eight populations of Elymus were classified by using cluster analysis. The results showed that: (1)The variation coefficients of height from flag leaf to basal spikelet(44. 695%)in vegetative organs and spikelet number per panicle(77. 005 %) in vegetative and reproductive was the hightest, respectively. (2)The overall mean phenotypic diversity index among different species(E, excelsus, E. cylindricus, E. tangutorurn and E. sibiricus) was 1. 333 ,ranging from a high of 1. 560 in E. dahuricus to 0. 920 in E. cy- lindricus. (3)According to correlation analysis, the elevation, longitude and ann:zal mean temperature have
出处
《西北植物学报》
CAS
CSCD
北大核心
2013年第5期1027-1033,共7页
Acta Botanica Boreali-Occidentalia Sinica
基金
草业生态系统教育部重点实验室甘肃农业大学开放课题基金项目(CYZS-2011004)
公益性行业(农业)科研专项(201003023)
现代农业产业技术体系项目(CARS-35)