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• W2000450488 abstract "Abstract The effect of water deficit on nitric oxide (NO) generation was investigated in cucumber ( Cucumis sativus cv. Dar) seedling roots using bio-imaging with an NO-selective fluorophor, diaminofluorescein-2-diacetate (DAF-2DA). Roots subjected to mild (5 and 10 h) water deficit showed slightly enhanced NO synthesis in cells of root tips and in the surrounding elongation zone. However, severe (17 h) stress resulted in an intensive NO production localized mainly in and above the elongation zone. Water stress-induced NO generation was blocked by a specific NO scavenger, 2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (cPTIO) as well as nitrate reductase (NR) and partially by nitric oxide synthase (NOS-like) inhibitors. A pharmacological approach was used in order to verify the capacity of NO to induce adaptive responses of cucumber roots to water deficit. A positive correlation was found between NO donor (SNP 100 μM and GSNO 100 μM) pretreatment and plant hydration status, measured as relative water content (RWC) during progressive dehydration. At an early stage (5 h) of stress duration NO caused a periodical increase in lipoxygenase (LOX) activity, correlated with time-dependent enhancement of lipid peroxidation. Beginning from 10 h up to severe stress (17 h) exogenous NO was able to diminish LOX activity and alleviate water deficit-induced membrane permeability and lipid peroxidation, measured as TBARS content and visualised by histochemical staining in situ . Observed changes via NO were accompanied by a significant reduction of proline level, suggesting that the accumulation of this osmolyte might not be essential in water stress tolerance. Obtained results clearly indicate that NO augmentation is likely to help the plant at the initial stage of tissue dehydration to trigger efficient mechanisms, mitigating severe water deficit effects in roots of cucumber seedlings." @default.
• W2000450488 created "2016-06-24" @default.
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• W2000450488 date "2009-12-01" @default.
• W2000450488 modified "2023-10-17" @default.
• W2000450488 title "Involvement of nitric oxide in water stress-induced responses of cucumber roots" @default.
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• W2000450488 doi "https://doi.org/10.1016/j.plantsci.2009.09.007" @default.
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