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Solute accumulation and distribution traits of an alkali resistant forage plant Kochia sieversiana and physiological contribution of organic acid under salt and alkali stresses

MA Ying1,2,GUO Li-quan3,ZHANG Shu-fang1,WANG Xiao-ping2,SHI De-cheng2(1.Department of Basic Medicine,Changchun Medical College,Changchun 130031,China;2.Key Laboratory of Vegetation Ecology,Ministry of Education,Northeast Normal University, Changchun 130024,China;3.Department of Bioengineering,Jilin Business and Technology College,Changchun 130062,China)  
The accumulation and distribution characteristics of various solutes from Kochia sieversiana seedlings stressed by salt and alkali were measured to study the physiological mechanisms in different parts of K.sieversiana and their role in adaptability to salt-alkalinized soil,and to identify the contribution of organic acid to salt-alkalinized habitat adaptability.There were considerable differences in the distribution of various solutes from different plant parts such as young leaves,mature leaves,young stems,old stems and roots.Organic acid was distributed mainly in stems and leaves,especially in mature and functional leaves on which photosynthetic productivity was dependent.Distributions of Na+,K+ and Ca2+ in different plant parts were uniform on the whole indicating that there was no competition for Na+,K+ and Ca2+ for absorption and transportation.Special absorption mechanisms of K+ and Ca2+ and distribution characteristics of various solutes from K.sieversiana were very important to its adaptability to salt-alkalinized soil.Organic acid in different parts,especially in mature leaves of K.sieversiana,was the dominant element in osmotic regulation,ion balance and pH adjustment,and was a key substance for the adaptation to saline and alkaline conditions.There were different adaptive mechanisms to salt and alkali stresses in different parts of K.sieversiana plants.
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