Protective role of putrescine against salt stress is partially related to the improvement of water relation and nutritional imbalance in cucumber
Protective role of putrescine against salt stress is partially related to the improvement of water relation and nutritional imbalance in cucumber
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DOI：
10.1080/01904160802325446
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发表时间：
2008-01-01
影响因子：
2.1
通讯作者：
Yu, J. Q.
中科院分区：
文献类型：
--
作者：
Shi, K.;Huang, Y. Y.;Yu, J. Q.
多胺在植物生长发育中起着多种生理作用。为探讨外源腐胺（Put）对植物抗盐胁迫的保护作用，在黄瓜（Cucumis sativusL.）CV.‘津研4号’）幼苗暴露于100 mM氯化钠（NaCl）处理。腐胺处理显著改善了NaCl对根系生长的不利影响，这与根系Na吸收减少和K积累增加有关。根中锰（Mn）含量降低盐胁迫，但增加了Put预处理。此外，与NaCl处理相关的渗透胁迫降低了叶片水势和含水量，而这些影响被Put预处理所缓解。Put处理也缓解了NaCl对叶片净光合速率（Pn）和气孔导度（Gs）的影响。说明腐殖酸在黄瓜抗盐胁迫中具有重要的保护作用。
Polyamines play a variety of physiological roles in plant growth and development. To investigate whether exogenous putrescine (Put) has roles in protecting plants against salt stress, Put (100 mu M) was added to nutrient solution three days before cucumber (Cucumis sativusL. cv. 'Jinyan No.4') seedlings were exposed to 100 mM sodium chloride (NaCl) treatment. Putrescine treatment significantly ameliorated the detrimental effects of NaCl on root growth and this was associated with a decrease of Na uptake and an increase in potassium accumulation in roots. Manganese (Mn) content in roots was decreased by salinity stress but increased by Put pretreatment. Furthermore, osmotic stress associated with NaCl treatment decreased leaf water potential and water content, while these effects were alleviated by Put pretreatment. The decreases in net photosynthetic rate (Pn) and stomatal conductance (Gs) by NaCl were also diminished by Put treatment. The results indicate that Put may play an important role in protecting cucumber plants against salt stress.