Effects of Salt Stress on the Content and Distribution of Na+ and K+ in 9 Hemerocallis fulva strains
The concentration and distribution of Na+and K+in different strains of Hemerocallis fulva under salt stress were measured to explore its salt resistance mechanism,in order to provide theoretical support for the ecological application and variety selective breeding.Eight lines of Hemerocallis fulva were used as materials to carry out 150 mmol/L NaCl stress treatment by water culture method.Materials were divided into five parts:tender leaves,mature leaves,older leaves,stem and root.And the dry matter content,the concentration and distribution of Na+and K+in different parts of Hemerocallis fulva under salt and non-salt conditions were analyzed.And the correlation between test indexes and salt tolerance of different strains was also discussed.The results showed that,salt stress had a greater inhibitory effect on dry weight of root,little on stems and mature leaves,and almost none on young and older leaves.The concentration of Na+in different parts of plants was significantly increased under salt stress.While the concentration of Na+in older leaves was much higher than that in other parts,the change in stem was rel-atively minimum.The effect of salt stress on K+mainly occurred in older and mature leaves,in which YC-1,TG-1,TY-1,ZZ-2 and WT-2 de-creased,ZZ-1 increased,LS-1 and JC-1 did not change significantly.The change of Na+/K+in materials under salt stress showed that older leaves＞mature leaves＞young leaves＞root＞stem.Through principal component analysis and membership function,the salt tolerance of each line based on changes of dry matter content and Na+/K+in different parts of plant was evaluated.The order of salt tolerance of the 8 lines was ZZ-1＞ZZ-2＞WT-2＞YC-1＞TG-1＞TY-1＞LS-1＞JC-1.The accumulation of Na+and K+in Hemerocallis fulva under salt stress showed an obvious une-ven distribution.The changes of dry weight and Na+/K+in different parts of plant could be used as indexes to evaluate the salt tolerance of dif-ferent lines of Hemerocallis fulva.
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