蜡梅天然群体表型多样性分析  

Phenotypic Diversity in Natural Populations of Chimonanthus praecox

作　　者：张彩霞[1,2] 左丹丹[1] 赵海涛[1,3] 邓敏 熊昌发 刘春[1] 袁素霞[1] 明军[1] 

机构地区：[1]中国农业科学院蔬菜花卉研究所,北京100081 [2]包头市园林科研所,内蒙古包头014010 [3]昌平区园林绿化局,北京102200 [4]万源市农业局,四川万源636350 [5]万源市林业局,四川万源636350

出　　处：《西南林学院学报》2011年第5期19-23,共5页Journal of Southwest Forestry College

基　　金：国家社会公益研究项目(2005DIB022)资助;湖北省自然科学基金(2004ABA142)资助;林木;花卉遗传育种教育部重点实验室开放基金(200605-12)资助

摘　　要：以蜡梅分布区内随机选取的9个天然群体为研究对象,对其叶片、果实、种子等8个表型性状进行多样性分析。结果表明:蜡梅表型性状在群体间存在广泛变异,8个性状群体间F值为0.99～65.90,除果实长和千粒质量,其他性状均达显著或极显著水平;群体内只有果实宽达显著水平,其他性状均不显著。8个性状的平均表型分化系数Vst为63.16%,群体间多样性贡献率为8.90%,群体内多样性贡献率为3.04%,显示群体间变异是蜡梅表型性状变异的主要来源。蜡梅表型性状与地理因子的相关分析表明:果实宽与纬度成极显著负相关,种子数和千粒质量与纬度成显著负相关,而其他性状和地理位置的相关性均不显著。利用群体间欧氏距离进行的UPGMA聚类分析结果表明,9个蜡梅天然群体性状的表型特征并没有完全依地理距离而聚类,反映了蜡梅呈间断式岛状分布现状。According to the morphology of leaf, fruit and seed and other 5 phenotypic traits of Chimonanthus praecox plants, the phenotypic diversity of C. praecox was analyzed by randomly choosing 9 natural populations as study objects in its distribution areas. The results showed that there was a great variation in morphological charac- teristics among the populations, the F values of the 8 phenotipic traits ranged from 0.99 to 65.90. There were sig- nificant differences or extremely significant differences in 6 of the 8 traits among the populations, except for the fruit length and unit grain weight indices. While inside the populations, there was significant difference only in the fruit width trait, and there were no significnat differences in other 7 traits within the populations. The mean phenotypic differentiation coefficient （ list ） of the 8 traits was 63.16%. The percentage of variance portion among populations was 8.90%, but 3.04% within the populations, indicating that the variance among populations was the main source of the phenotypic variation. The correlation analyses of the phenotypic traits with the geographical factors showed that there was extremely significant negative correlation between the width of fruit and latitude, and there was significant negative correlation between seed quantity, the unit grain weight and the latitude respectively. There was no significant correlation between 6 other phenotypic traits and the geographical factors. The UPGMA cluster analysis showed that the phenotypic traits of the 9 natural populations of C. praecox were not fully clustered in accordance with the geographical distance, and this conclusion was reflected by the interrupted island distribution pattern of C. praecox populations.

关 键 词：蜡梅 天然群体 表型多样性 

分 类 号：S718.54[农业科学—林学]