干旱锻炼对提高辣椒抗旱性的形成研究

Improving Drought Resistance of Pepper(Capsicum annuum L.)through Drought Hardening

为探明辣椒水分逆境生理,对穴盘育苗的辣椒幼苗进行"控水—半萎蔫—复水—恢复"的循环干旱锻炼。结果表明:短期干旱胁迫对辣椒叶片叶绿素的形成产生抑制作用;辣椒叶片保护酶系统(SOD,POD)活性逐渐加强,丙二醛的含量明显提高;同时,干旱锻炼能明显提高辣椒幼苗叶片中可溶性糖的含量,降低细胞渗透势;当干旱锻炼过的辣椒植株遭受后续的干旱胁迫时,与对照组相比,辣椒叶片中能积累更多的可溶性糖,从而降低细胞渗透势,使叶片能维持较高的膨压。最终使干旱锻炼过的辣椒植株能更好地适应后续的干旱胁迫,提高其抗旱性。

In order to ascertain physiological reaction of the pepper （Capsicum annuum L. ） under water stresses, we conducted cycling drought hardening on pepper seedlings raised on floating trays by the circle of ＂water control-half wilting-rehydration-recovery＂. The results showed that short period drought stress could inhibit the formation of the chlorophyll in pepper leaves. However, the activities of protective enzyme system （SOD, POD） were gradually strengthened and especially the content of MDA increased obviously. Meanwhile, short period drought stress could obviously increase the content of soluble sugar in leaves and decrease cell osmotic potential in leaves. Compared with control, the drought-hardened seedlings could accumulate more soluble sugar and maintain higher pressure potential through decreasing osmotic potential in leaves than seedlings without drought hardening, when they were subjected to subsequent drought. Thus, drought hardening can increase drought resistance of pepper.