Effects of NaCl stress on some physiological characteristics of white clover

The seedling of Trifolium repens was treated with different concentrations of NaCl. The dynamics of chlorophyll a (Cha), chlorophyll b (Chb) and total contents of chlorophyll (Chl) and cell membrane permeability in response to salt stress were studied. The results showed that the contents of Cha, Chb, Chl and the relative conductivity increased at first and then decreased when NaCl concentration increased or salt stress was prolonged. The contents of Cha, Chb and Chl increased when NaCl concentration was below 150 mmol/L, and then they decreased along with the increase of NaCl concentration. The relative conductivity reached the maximun at 200 mmol/L of NaCl concentration.