Effect of Drought Stress on Anatomical Structure of Leave and Physiological Characteristics in Three Atriplex L.Seedling

Drought is the most important factor on restricting plant growing,and drought resistance of plant will influence vegetation construction largely.Though controlling water by potted planting drought stress experiment(80%,60%,45%,30%and 20% of maximum field capacity,belonging to control,middle water stress,moderate water stress,severe water stress,and very severe water stress,respectively),meanwhile design natural drought experiment after sufficient irrigation as control.The anatomical,physiological and biochemical characters were analyzed,to understand its affect to physiological and biochemical indexes:leaf anatomical characteristics,leaf relative water content(RWC),chlorophyll content(Chl),net photosynthetic rate(Pn),soluble sugar content(SS),cytomembrane permeability and MDA content of 3 Atriplex L..The results showed that:(1)Three testing plants owned typical leaf structural characters to fitting drought environment.Leaf organization structure form under drought stress condition showed that palisade tissue was thinning gradually,spongy tissue was thinning then thickening and mesophyll structure tightness(CTR) also appear was first lowered and then stimulated.(2)Along with the increasing of drought stress,SS was also increased while RWC was decreased;three Atriplex L.can maintain above 52% of RWC under lower water content in soil.(3)Under drought stress,Tr,Pn and amount of Chl all had a notable change.(4)Under drought stress,cell membranes of three AtriplexL.were harmed obviously.Drought resistance of three AtriplexL.under drought stress comprehensively showed that Atriplex canescens ssp.apteraAtriplex canescens ssp.canescens var.laciniata ParishAtriplex canescens(Pursh)Nutt.