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A comparative study on the content of barbaloin and structure of leaves in 9 species of Aloe L.

SHEN Zong gen 1,2 ,LI Jing yuan 1,Yitzchak GUTTERMAN 2,HU Zheng hai 1* (1 Institute of Botany,Northwest University,Xian,Shaanxi,710069,China;2 Jacob Blaustein Institute for Desert Research and Department of Life Science,Ben Gurion Univers  
Comparative anatomical studies on leaves in 9 species of Aloe show that their leaves have the characteristics of xerophytes obviously.The big well-developed parenchymatous cells in the T phloem pole is the common characteristic of the leaves in this genus.However,there is,among 9 species,significant differences in characteristics such as thickness of cuticle of outer epidermal cell walls,shape and size of suprastomatal and stomatic chamber,layers and differentiation of chlorenchymatous cells,size and density of vascular bundle,ratio of big parenchymatous cells to vascular bundle and area ratio of aquiferous tissues the leaf across section and so on.Morever,these characteristics are stable and have some taxonomically significance in this genus. Results of phytochemisty indicated that there are positive correlation between the content of barbaloin or homonataloin and some anatomical factors including the density of vascular bundles,the ratio of the big parenchymatous cells in phloem pole to the whole vascular bundles and the width of the chlorenchyma.The results provide botany anatomical basis for breeding improved the commecial Aloe.
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