Journal
PLANT SCIENCE
Volume 163, Issue 3, Pages 515-523Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/S0168-9452(02)00159-0
Keywords
H2O2; nitric oxide; salt stress; heat stress; abiotic stress tolerance
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Higher plants growing in natural environments experience various abiotic stresses. H2O2 and nitric oxide (NO) free radicals are produced and cause oxidative damage to plants under various abiotic stress conditions. However, in the present study, we found that pretreating rice seedlings with low levels (< 10 muM) of H2O2 or NO permitted the survival of more green leaf tissue, and of higher quantum yield for photosystem 11, than in non-treated controls, under salt and heat stresses. It was also shown that the pretreatment induces not only active oxygen scavenging enzymes activities, but also expression of transcripts for stress-related genes encoding sucrose-phosphate synthase, Delta'-pyrroline-5-carboxylate synthase, and small heat shock protein 26, These results suggest that H2O2 and NO can increase both salt and heat tolerance in rice seedlings by acting as signal molecules for the response. (C) 2002 Elsevier Science Ireland Ltd. All rights reserved.
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