Effects of exogenous calcium on the seed germination and seedling ions distribution of trifolium repens under salt-stress

Taking experiments of germination and seedling growth of Trifolium repens under salt stress under the conditions of phytotron,the effects of supplementary CaCl2(0.5,1,2,4,8g/L) on germination and seedling growth at NaCl concentration(6g/L) stress, especially on the distribution of Na +,K+,Ca2+,Mg2+ in roots and shoots were studied. The results show that proper supplementary CaCl 2(2g/L)can improve seeds germination and seedling growth significantly under 6g/L NaCl, but high level CaCl2(8g/L) inhibit seeds germination, supplementary 2g/L CaCl2 can stimulate growth of seedling,and increase shoot/root ratio, and maintain ion balance(the K +, Ca2+ concentration in the seeding increase and Na + concentration decrease significantly),and improved salt tolerance, but 8g/L CaCl2 results in adverse effects to the germination and seedling growth,also disturbs the ion homeostasis. © 2011 IEEE.