Journal
JOURNAL OF PLANT PHYSIOLOGY
Volume 167, Issue 16, Pages 1371-1379Publisher
ELSEVIER GMBH, URBAN & FISCHER VERLAG
DOI: 10.1016/j.jplph.2010.05.021
Keywords
Heme oxygenase/carbon monoxide; Lipid peroxidation; Nitric oxide; Osmotic stress; Seed germination
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Funding
- New Century Excellent Talents in University [NCET-07-0441]
- Fundamental Research Funds for the Central Universities [KYZ200905]
- 111 project of China [B07030]
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To investigate the mechanism and signaling pathway of carbon monoxide (CO) and hematin in alleviating seed germination inhibition and lipid peroxidation polyethylene glycol-6000 (PEG) was used to mimic osmotic stress in a series of experiments The results showed that wheat seeds pretreated with a lower dose of PEG (12 5%) showed higher tolerance against osmotic stress as well as the up-regulation of heme oxygenase (HO EC 1 14 99 3) and decreased lipid peroxidation during recuperation compared to those with a higher dose of PEG (50%) Exposure of wheat seeds to 25% PEG HO-1 inhibitor or specific scavenger of nitric oxide (NO) alone differentially led to seed germination inhibition The PEG-induced inhibitory effects on seed germination were ameliorated by the HO-1 inducer hematin CO or NO donor Additionally hematin was able to markedly boost the HO/CO system However the addition of the HO-1 inhibitor or the specific scavenger of NO not only reversed the protective effects conferred by hematin but also blocked the up-regulation of HO/CO In addition hematin-driven NO production in wheat seeds under osmotic stress was confirmed Based on these results we conclude that the endogenous HO/CO signal system is required for the alleviation of osmotic stress-induced wheat seed germination inhibition and lipid peroxidation which might have a possible interaction with NO (C) 2010 Elsevier GmbH All rights reserved
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