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- W1146206296 abstract "Growth,leaf photosynthetic parameters and Cl-,Na+ and K+ of distribution status in Helianthus tuberosus L.seedlings were studied under NaCl stress with different concentrations of 0(CK),50 and 100 mmol·L-1.The results show that fresh and dry weights of above-ground part and whole seedling all decrease gradually and have significant differences compared with the control group(P0.05),and also those of under-ground part appear gradual decreasing trend but only has a significant difference between 100 mmol·L-1 NaCl treatment group and the control group(P0.05).With NaCl concentration rising,net photosynthetic rate(Pn) and stomatal conductance(Gs) of leaf decrease gradually,while water use efficiency(WUE) and stomatal limitation(Ls) increase gradually,but generally,all differences of the four indexes are not significant among different treatment groups(P0.05).In 50 and 100 mmol·L-1 NaCl treatment groups,Pn is 85.6% and 44.9%,Gs is 67.9% and 57.1%,WUE is 1.25 and 1.54 times and Ls is 1.57 and 1.64 times of their respective control group.In above-ground and under-ground parts of seedlings,contents of Cl-and Na+ increase gradually while K+ content decreases gradually with NaCl concentration rising,and the difference of Na+ content is significant but that of K+ content is not significant among different treatment groups.Na+/K+ ratios of above-ground and under-ground parts all increase with NaCl concentration rising,and under 0,50 and 100 mmol·L-1 NaCl stress,Na+/K+ ratio of above-ground part is 0.26,0.83 and 2.39 and that of under-ground part is 0.51,1.16 and 2.83,respectively.Contents of Cl-,Na+ and K+ of above-ground part are all obviously higher than those of under-ground part in different treatment groups,showing most of Cl-,Na+ and K+ Absorbed by under-ground part being transferred to above-ground part.It is concluded that NaCl stress has some inhibition to growth and photosynthesis,and also influences on ion balance in H.tuberosus seedling,therefore,disturbs normal growth of H.tuberosus seedlings." @default.
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- W1146206296 date "2010-01-01" @default.
- W1146206296 modified "2023-09-28" @default.
- W1146206296 title "Effects of NaCl stress on growth, leaf photosynthetic parameters and ion distribution of Helianthus tuberosus seedling." @default.
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