盐胁迫对甜瓜种子萌发及幼苗SOD·POD活性的影响

目的]研究盐胁迫对甜瓜种子萌发特性以及幼苗细胞保护酶活性的影响。方法]以3种甜瓜品种的种子为试材，混合盐溶液设5个浓度处理，供试种子在冷水浸泡24h发芽后加入等量处理液进行盐胁迫处理，测定各个处理的发芽率、发芽势、SOD和POD活性。结果]随着盐溶液浓度的增大，甜瓜种子发芽率和发芽势呈下降趋势，3种甜瓜种子的耐盐性由高到低分别是：兴农8号、齐甜1号、龙甜3号。在不同浓度的盐胁迫处理下，甜瓜幼苗SOD活性先下降，最小值达到0．0133U／mg，再升高，最大值达到0．0311U／mg．之后降低；POD的活性先上升，最大值达到0．6372U／g，之后缓慢下降。高浓度盐胁迫超过幼苗自身的忍耐程度时，导致POD和SOD的活性均下降。结论]该研究为甜瓜的栽培、耐盐性品种的筛选提供技术依据。

Effects of Salt Stress on the Seed Germination of Melon and POD and SOD Activities in Its Seedlings

Objective] The purpose was to study the effects of salt stress on seed germination characteristic and the cell protection enzyme activities in melon seedlings.Method] With the seeds of 3 kinds of melon varieties as the tested materials,5 gradient treatments were sup up for the mixed salt solution.The tested seeds were first soaked in cool water for 24 h for germination and then added with equal amount of treating solution for salt stress.The germination rate,germination viability,and the activities of SOD...