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Effect of salt stress on the contents of chlorophyll and betaine and its membrane permeability of Medicago sativa

WANG Yu-xiang1,ZHANG Bo1,WANG Tao2(1.Key Laboratory of Grassland Resource and Ecology of Xinjiang,Xinjiang Agricultural University,Urumqi 830052,China;2.State Key Laboratory for Agrobiotechnology,China Agricultural University;Beijing 100094,China)  
The contents of chlorophyll and betaine,and the membrane permeability of transgenic alfalfa and Baoding alfalfa under salt stress were studied.The result showed that the contents of chlorophyll and betaine increased with the salt stress,but the membrane permeability reduced.And alfalfa adapted to salt stress and reduced injury through a series of protection mechanism,including higher content of chlorophyll and betaine and the lower membrane permeability.It suggested that the tolerance of transgenic alfalfa to salt stress was strong.
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