Journal
JOURNAL OF PLANT RESEARCH
Volume 125, Issue 1, Pages 155-164Publisher
SPRINGER JAPAN KK
DOI: 10.1007/s10265-011-0417-y
Keywords
Abscisic acid; Oryza; Sodium nitroprusside; Transpiration rate; Water stress
Categories
Funding
- National Natural Science Foundation of China [30623006, 30871473]
- China National Key Technology RD Program [2009BAK43B12]
- Specific Foundation of Commonweal Program (Agriculture) [NYHYZX07-001]
- Zhejiang Provincial Natural Science Foundation of China [Y3100090, Y3100060, Y3110040]
- Zhejiang Key Program Foundation [2008 C22073, 2009C32048]
- Sannong Wufang Program of Zhejiang Province [SN200806]
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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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