Variations of the Composition of the Leaf Cuticular Wax among Chinese Populations of Plantago major
Variations of the Composition of the Leaf Cuticular Wax among Chinese Populations of Plantago major
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DOI：
10.1002/cbdv.201400216
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发表时间：
2015-04-01
影响因子：
2.9
通讯作者：
Ni, Yu
中科院分区：
文献类型：
--
作者：
Guo, Yanjun;He, Yuji;Ni, Yu
车前在中国广泛分布，种群间差异很大。表皮蜡组成的分析为不同环境条件下的大青蟹种群分类提供了一种可能的方法。12个种群的P. major和5个种群的P. depressaWilld.，对分布于年平均气温-2.0 ~18.4 ℃地区的10种白蜡虫进行了采样，分析了其表皮蜡组成的变化，并计算了其平均链长（ACL）和碳偏好指数（CPI）。大的内部和种间的变化，观察总蜡含量。生境年平均温度与优势碳原子数为奇数的正构烷烃的相对含量呈显著正相关，而与蜡质含量无显著相关性。随着年平均气温的升高，正构烷烃C-29和C-31的相对含量降低，而C-33和C-35的相对含量以及ACL（总）和ACL（27-33）值升高。正构烷烃的分布模式的聚类分析可以明确地分离的种群P. major根据其栖息地的年平均温度，但没有分开的两种种群。因此，正构烷烃的分布模式可能是一个很好的分类标志，在种内的水平，但不是在种间水平。然而，一个小的差异，观察到的两个物种的种群之间的ACL（总）和CPItotal的值，这意味着潜在的使用这些指数的两个物种的种群在种间水平的分类。
Plantago major L. grows in a very wide range of regions in China and exhibits great variations among populations. The analysis of the cuticular-wax composition provides a potential approach to classify populations of P. major confronting different environmental conditions. Twelve populations of P. major and five populations of P. depressaWilld., distributed over regions with average annual temperatures ranging from -2.0 to 18.4 degrees, were sampled, the variation of the composition of their cuticular waxes was analyzed, and their values of average chain length (ACL) and carbon preference index (CPI) were calculated. Great intra- and interspecies variations were observed for the total wax contents. The average annual temperature of the habitats was significantly correlated with the relative contents of the dominant n-alkanes with an odd number of C-atoms, but not with the wax contents. With an increasing average annual temperature, the relative contents of n-alkanes C-29 and C-31 decreased, whereas those of C-33 and C-35 as well as the values of ACL(total) and ACL(27-33) increased. Cluster analysis based on the pattern of the n-alkane distribution allowed to clearly separate the populations of P. major according to the average annual temperature of their habitats, but not to separate the populations of the two species. Hence, the pattern of the n-alkane distribution might be a good taxonomic marker for P. major at the intraspecies level, but not at the interspecies level. Nevertheless, a small difference between the populations of the two species was observed concerning the values of ACL(total) and CPItotal, implying the potential use of these indices for the classification of the populations of the two species at the interspecies level.