Effects of Water Stress on Photosynthetic Characteristics and Growth Rate of Three Kinds of Leguminous Vine

The drought resistance of the native medicinal Leguminous vine was investigated,so as to provide theoretical basis for choosing afforestation plants with easy survival,high resistance,high value in central Hunan region. In this study,three Leguminous vines( Millettia pachycarpa Benth,Millettia tsui Metc and Mucuna sempervirens Hemsl) were used as materials. The three Leguminous vines roots were dealed with PEG-6000 to investigate the net photosynthetic rate,total chlorophyll content,main root length,root volume and basal diameter when they were under simulated physiological drought,and the subordinate function value of the above indexes were calculated to analyze the drought resistance of the three Leguminous vines. The results showed that with the increase of PEG-6000 concentration,the net photosynthetic rate and total chlorophyll content decreased,main root length,root volume and basal diameter first increased then decreased. Comprehensive evaluation by subordinate function values of the five indexes showed that,the drought resistance order was Mucuna sempervirens Hemsl( 0. 567 4) Millettia pachycarpa Benth( 0. 546 8) Millettia tsui Metc( 0. 478 3).

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