Protective role of proline against salt stress is partially related to the improvement of water status and peroxidase enzyme activity in cucumber
Protective role of proline against salt stress is partially related to the improvement of water status and peroxidase enzyme activity in cucumber
复制标题
脯氨酸对盐胁迫的保护作用部分与黄瓜水分状况和过氧化物酶活性的改善有关
DOI：
10.1111/j.1747-0765.2009.00412.x
复制
发表时间：
2009-10-01
影响因子：
2
通讯作者：
Wang, Weijuan
中科院分区：
文献类型：
--
作者：
Huang, Yuan;Bie, Zhilong;Wang, Weijuan
A salt-sensitive cucumber cultivar "Jinchun No. 2" (Cucumis sativus L.) was used to investigate the role of proline in alleviating salt stress in cucumber. Proline was applied twice (day 0 and day 4 after salt treatment) as a foliar spray, with a volume of 25 mL per plant at each time. Plant dry weight, leaf relative water content, proline, malondialdehyde (MDA), Na+, K+ and Cl- contents, as well as superoxide dismutase (SOD), peroxidase (POD), catalase (CAT) and ascorbate peroxidase (APX) activities in the plants were determined at day 8 after salt treatment. The results showed that 100 mmol L-1 NaCl stress significantly decreased plant dry weight, leaf relative water and K+ contents, and increased leaf MDA, Na+ and Cl- contents and SOD, POD, CAT and APX activities. However, leaf proline accumulation was not affected by salinity. The exogenous application of proline significantly alleviated the growth inhibition of plants induced by NaCl, and was accompanied by higher leaf relative water content and POD activity, higher proline and Cl- contents, and lower MDA content and SOD activity. However, there was no significant difference in Na+ and K+ contents or in CAT and APX activities between proline-treated and untreated plants under salt stress. Taken together, these results suggested that the foliar application of proline was an effective way to improve the salt tolerance of cucumber. The enhanced salt tolerance could be partially attributed to the improved water status and peroxidase enzyme activity in the leaf.
