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The Anatomical Ecology Studies on The Leaf of 13 Species in Caragana Genus

YAN Ling LI Hong LIU Yan(College of Ecology and Enviroment, Inner Mongolia Agricultural University,Hohhot 010019)  
The anatomical observation on leaves of the 13 species of Caragana genus and comparative analysis on different species from the same region and the same species from different regions were described in this paper.The results showed that the anatomical structure of the leaves in the different area of Caragana genus showed gradient changes regularly,especially distinguishable for the changes of the morphological structure of their leaves.The 13 species of Caragana genus distributed in the arid region of Northwest of China,the drought-resisting characters were developed more and more,from east to west on the basis of their regular changes of anatomical structures.Which are: the leaf area tending to become smaller, well developed palisade tissue,the intercellular space tending to become smaller,well developed epidermic hairs covering leaf surface and the stronger cutinzation,and conducting tissue and mechanical tissue in vein being developed more and more.
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