外源腐胺对盐胁迫下黄瓜幼苗叶片PSⅡ光化学特性和体内离子分布的影响

被引:28
作者
束胜
孙锦
郭世荣
李娟
刘超杰
王长义
杜长霞
机构
[1] 南京农业大学园艺学院农业部南方蔬菜遗传改良重点开放实验室
关键词
黄瓜; 腐胺; 盐胁迫; PSⅡ光化学; 离子分布;
D O I
10.16420/j.issn.0513-353x.2010.07.005
中图分类号
S642.2 [黄瓜];
学科分类号
摘要
以黄瓜品种‘津优4号’为材料,采用营养液栽培,研究了外源腐胺(Putrescine,Put)对NaCl胁迫下幼苗叶片光系统Ⅱ(PSⅡ)光化学特性和器官离子分布的影响。结果表明,外源Put提高了NaCl胁迫下黄瓜幼苗叶片最大光化学效率(Fv/Fm)、PSⅡ实际光化学效率(ΦPSⅡ)和保护性热耗散(ΦNPQ),显著增强光耐受能力和电子传递能力,降低了光损伤程度,抑制了植株体内Na+和Cl-向地上部的运输,显著降低了叶中Na+和Cl-的含量。说明外源Put能够减少NaCl胁迫下盐离子进入植株叶中,降低离子毒害,减轻不可逆光抑制,进而缓解盐胁迫对黄瓜幼苗光合机构的伤害。
引用
收藏
页码:1065 / 1072
页数:8
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