Ca^(2+)离子对蒜根生长和细胞分裂的影响

Effect of Ca^(2+) on the Mitosis and Growth of the Bulb Root of Allium L.

用不同浓度 (100～ 400mg/L)的 Ca(NO3)2溶液处理蒜鳞茎，研究对蒜根生长和有丝分裂的影响 .结果表明：随着 Ca2＋浓度的增大，有丝分裂指数先升后降（ 200 mg/L最大），随时间延长分裂指数升高，但 400 mg/L时则相反 .核异常细胞比率随浓度增加而增加，随时间延长而减少，核异常的突出表现为染色体解体在各浓度时间内普遍发生 .本实验结果显示： Ca2＋对细胞分裂和细胞核的影响与重金属有很大差别 .

The bulb of Allium L. was treated in solution in which there were different Ca(NO3)2 concentrations to study the effect of Ca2＋ on the mitosis and growth of bulb root of Allium L. It was shown that: the mitosis index was higher at first and then lower (200mg/L maximum) with the increase of concentrations, the mitosis index was higher with the prolong of treatment time, but 400mg/L on the contrary. The rate of abnormal nucleus cells rose with the bigger of concentrations and lowered with the prolong of treatment time. The obvious characteristic was that more chromosome disintegration appeared in all concentrations all the time. This test results indicated that the effect of Ca2＋ on the mitosis index and abnormal nucleus was different with heavy metal.