%0 Journal Article
%A Chi-Ying Hunag
%T Salt-Stress Induces Lipid Degradation and Lipid Phase Transition in Plasma Membrane of Soybean Plants(1)
%D 1996
%J Taiwania
%V 41
%N 2
%P 96-104
%U https://taiwania.ntu.edu.tw/abstract/340
%X Soybean seedlings were grown under NaCl-stress and non-stress conditions. To induce salt stress, the water potential of Hoagland solution, which was used to culture the soybean plants, was adjusted to -1.6 MPa daily with saturated NaCl solution. Leaf plasma membranes were isolated and assayed for lipid content, phospholipid class composition, and the fatty acid composition of total phospholipids of plasma membranes. Lipid phase transition temperature and  lipoxygenase activity were also measured. The plasma membrane contained a higher concentration of phospholipid than that of glycolipid. The phospholipid(PL) contained higher contents of saturated fatty acids than that of unsaturated fatty acids. Under salt-stress, the ratio of saturated/unsaturated fatty acids became higher, and the enthalpy of lipid phase transition in leaf plasma membranes was raised . A large increase in the lipoxygenase activity in salt-stressed plasma membranes may have contributed to the decline in PL. These results suggest that the plasma membrane of leaves from  soybean plants grown under the salt-stress became solidified, and this solidification of the plasma membrane might be the limiting factor that restricts plant growth under salt-stress environments.
%M doi:10.6165/tai.1996.41.96