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Different physiological responses of Aneurolepidium chinense to NaCl and Na_2CO_3

YAN Hong~1,ZHAO Wei~2,YIN Shang-jun~3,SHI De-cheng~1,ZHOU Dao-wei~1(1.School of Life Sciences,Northeast Normal University,Changchun 130024,China;2.Avigation University of Air Force,Department of Avigation Lifesaving,Changchun 130022,China;3.Department of Life Sciences,Zhengjiang Wanli University,Ningbo 315101,China)  
The seedlings of A.chinense were stressed by NaCl(0-700 mmol/L) and Na_2CO_3(0-200 mmol/L).Many physiological indices were determined: relative growth rate,relative water content,root activity,cytoplasm osmosis,concentrations of chlorophyll and nitrogen.The results showed that the seedlings of(A.chinense) were alive only when the concentrations of salts were lower than 600 NaCl and 175 mmol/L Na_2CO_3.The growth of A.chinense was obviously depressed and with increasing salt concentrations,tiller rate,rhizome number,RGR,RWC,and concentrations of chlorophyll and nitrogen decreased.The effects of Na_2CO_3 on the growth of A.chinense were more severe than those of NaCl.The permeability of plasmalemma was increased and the function eventually destroyed by both NaCl and Na_2CO_3 stress.The extravasation rates of potassium and electrolyte increased with increasing salt stress.The concentrations of TTC,(the index of root activity),were decreased with increasing salt stress and were almost zero when the concentration of Na~+ exceeded 200 mmol/L.The effects of Na_2CO_3 were different and more severe than those of NaCl.
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