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植物研究 ›› 2010, Vol. 30 ›› Issue (2): 164-169.doi: 10.7525/j.issn.1673-5102.2010.02.007

• 论文 • 上一篇    下一篇

青藏高原东缘西藏沙棘(Hippophae tibetana)果实性状变异

温江波;孙坤*;晏民生;虎瑞;孙文斌   

  1. 西北师范大学生命科学学院,兰州 730070
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2010-03-20 发布日期:2010-03-20
  • 通讯作者: 孙坤
  • 基金资助:
     

Variation in Fruit Characteristics of Hippophae tibetana(Elaeagnaceae) in the Eastern Qinghai-Tibet Plateau,China

WEN Jiang-Bo;SUN Kun*;YAN Min-Sheng;HU Rui;SUN Wen-Bin   

  1. College of Life Science,Northwest Normal University,Lanzhou 730070
  • Received:1900-01-01 Revised:1900-01-01 Online:2010-03-20 Published:2010-03-20
  • Contact: SUN Kun
  • Supported by:
     

摘要: 西藏沙棘是沙棘属(Hippophae L.)中分布于青藏高原和喜马拉雅高海拔地区的特有类群之一,其果实大小、形状、颜色以及条纹长等性状表现出了高度的多样性。对分布于青藏高原东缘西藏沙棘7个天然居群的果长、果宽、果形系数(果长/果宽) 、果柄长、纹长等果实性状变异进行了统计分析,探讨了其果实变异水平及地理变异式样。结果表明,西藏沙棘5个果实性状在居群间和居群内均存在着极显著差异(p<0.01)(除纹长在居群间存在着显著差异(p<0.05)),居群间变异系数(CV)在11.19%~45.03%之间,果柄长的变异幅度最大(CV为45.03%),其次为纹长(CV为31.97%),变异幅度最小的是果宽(CV为11.19%);表型分化系数(Vst)在0.213 3~0.629 9之间,平均值为0.489 5,居群间和居群内变异约各占果实变异的一半。相关性分析显示,除果长与果柄、果宽与纹长外,其它各性状间均表现出极显著相关(p<0.01),除果长与海拔、果宽与经纬度外,其它各性状与地理因子之间均达到极显著相关(p<0.01),呈现出地理梯度变异,聚类分析表明7个居群按照地理距离远近聚类。

关键词: 西藏沙棘, 居群, 果实性状, 表型变异, 地理变异

Abstract: Hippophae tibetana Schlecht. is one of the endemic species of Hippophae L. in the high altitude area of Qinghai-Tibet Plateau and Himalayas. It presents high variety in the size, shape and color of its fruits, the length of fruit stalk, etc. The variation in fruit characteristics such as fruit length, fruit width, indexes of fruit shape, the length of fruit stalk and fruit ornamentation length of 7 natural populations, distributing in the eastern Qinghai-Tibet Plateau, were analyzed statistically in order to study its variation level and geographic variation patterns. The results showed that very significant variation existed among and within populations (p<0.01),except the fruit ornamentation length among populations(p<0.05). Coefficient of variation(CV) ranged between 11.19% and 45.03%, the length of fruit stalk presented the greatest variation (CV was 45.03%), followed by ornamentation length of fruit(CV was 31.97%), fruit width presented the least variation(CV was 11.19%). Phenotypic differentiation coefficients of variance (Vst) ranged from 0.213 3 to 0.629 9 and the mean was 0.489 5. Each of the variation among and within populations accounted for a half of the fruit variation. Correlations analysis indicated that there were very significant correlations among the fruit characteristics (p<0.01) except the fruit length and the length of fruit stalk, fruit width and fruit ornamentation length. There were also very significant correlations between characteristics and geographical factors (p<0.01) except fruit length and altitude, fruit width and latitude and longitude. Some fruit characteristics showed geographic variation gradient.Cluster analysis indicated that 7 populations clustered according to the geographical distance.

Key words: Hippophae tibetana, population, fruit characteristics, phenotypic variation, geographical variation

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