两不同种源马蔺在NaCl胁迫和解胁恢复中的生长及无机离子响应

hinese Iris (Iris lactea Pall. var. chinensis (Fisch.) Koidz.) is a herbaceous, monocotyledonous, salt-tolerant plant, widespread in arid and semiarid regions in China. It has many uses in soil conservation, saline land utilization, and urban greening. It is unclear whether there is a variation in salt tolerance of different germplasm Irises. In this study, seeds of Chinese Iris were collected in Beijing(Bj) and Xinjiang(Xj). Their seedlings were then put into hydroponic experiments with two concentrations of NaCl stress（140 and 280 mmol L-1）and subsequent recovery treatments-a total of 12 plots after interactive combination. By analyzing the stress - recovery effect of growth and ionic contents, to study the salt tolerances of two irises, it is found that the growth inhibition of Xinjiang Iris by salt is lighter, thus the growth rate after subsequent recovery treatment is faster. The inhibition of NaCl of the water content of shoots is greater than those of roots, and the water deficit of Bj Iris is greater than that of Xj. Xj Iris has stronger ion selectivity than that of Bj Iris, which is mainly shown in transportation of ions during salt stress period. After recovery, the level of increment of K+ content in the shoots of Xj Iris is higher than that of Bj Iris. The salt tolerance of Xj Iris is greater than that Bj Iris.