Ca^(2+)对黄瓜种子萌发及幼苗生理特性的影响

Effect of Ca^(2+) on seed germination and seedling physiological characteristics of cucumber

以黄瓜为试验材料,设置不同Ca2+浓度处理,研究了Ca2+浓度对黄瓜种子萌发和幼苗生理特性的影响。结果显示,低浓度Ca2+处理(0~0.05 mg/L)对黄瓜种子萌发和幼苗生长有促进作用,当Ca2+浓度为0.05 mg/L时最有利于黄瓜种子萌发和幼苗生长,其种子发芽率,发芽势,发芽指数,活力指数,根长,下胚轴长,下胚轴粗度,生物量,含水量均高于对照及其他浓度处理;幼苗体内的丙二醛含量,质膜相对透性,游离脯氨酸含量,可溶性糖含量及POD活性均呈下降趋势并在此浓度得到最低。但从0.5mg/L开始,随着Ca2+浓度增加,黄瓜种子萌发的各项指标开始下降,幼苗生长的各项生理指标开始上升,对黄瓜种子发芽和幼苗生长产生抑制作用,并在2.0 mg/L时抑制作用得到最大。

The effect of different Ca^2＋ concentration on the seed germination and seedling growth of cucumber （Cucum/s sat/vus L. ） had been studied. The results showed that Ca^2＋ of lower concentration （0 -0.05 mg/L） could promote the seed germination and seedling growth of cucumber. It was beneficial to seed germination and seedling growth of cucumber by using 0.05 mg/L Ca^2＋ concentration, and the germination rate,germination index,vigor index, length of root, length of hypocotyls, diameter of hypocotyls and water content of seedlings were higher than those of control and other Ca^2＋ concentration, and the MDA content, soluble sugar content, plasma membrane relative permeability, proline content and POD activity of cucumber seedling were decreased. But after 0.5 mg/L, the physiological indicators of seed germination decreased with the increase of Ca^2＋ concentration and those of seedling growth increased. The high concentration of Ca^2＋ had an inhibition effect on the seed germination and seedling growth and had the largest inhibition effect at 2.0 mg/L.