Drought-induced proline accumulation is uninvolved with increased nitric oxide,which alleviates drought stress by decreasing transpiration in rice |
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Authors: | Jie Xiong Long Zhang Guanfu Fu Yongjie Yang Cheng Zhu Longxing Tao |
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Institution: | (1) State Key Laboratory of Rice Biology, China National Rice Research Institute, 359 Tiyuchang Road, Hangzhou, 310006, People’s Republic of China;(2) State Key Laboratory of Plant Physiology and Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou, 310058, People’s Republic of China;(3) College of Life Sciences, China Jiliang University, Hangzhou, 310018, People’s Republic of China |
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Abstract: | Accumulation of proline is trusted to be an adaptive response of plants against drought stress, and exogenous application
of nitric oxide (NO) enhances proline accumulation in Cu-treated algae. In order to investigate whether NO works as a necessary
signaling molecule in drought-induced proline accumulation in rice leaves, effects of drought stress on endogenous NO content
and proline accumulation were studied in rice leaves, using sodium nitroprusside (SNP, a NO donor) and 2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide
(cPTIO, a NO scavenger). The results showed that drought treatment increased both endogenous NO and proline contents in rice
leaves, while foliar spray of various concentrations of SNP failed to induce proline accumulation in the leaves of well-watered
rice and foliar spray of cPTIO failed to inhibit proline accumulation in the leaves of drought-stressed rice. These results
indicate that increase of endogenous NO is dispensable for proline accumulation in the leaves of rice under drought stress.
Further studies indicate that exogenous application of NO alleviates drought-induced water loss and ion leakage by decreasing
transpiration rate of rice leaves. |
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