Abstract
The present study investigated the linkages between drought stress, oxidative damages and variations in antioxidants in the three rice varieties IR-29 (salt-sensitive), Pokkali (salt-tolerant) and aromatic Pusa Basmati (PB), to elucidate the antioxidative protective mechanism governing differential drought tolerance. Water deficit, induced by 20% (w/v) polyethylene glycol (PEG-6000), provoked severe damages in IR-29 and PB in the form of huge chlorophyll degradation and elevated H2O2, malondialdehyde and lipoxygenase (LOX, EC 1.13.11.12) levels as compared to Pokkali. The protein oxidation was more conspicuous in IR-29. Increment in antioxidants, particularly flavonoids and phenolics was several folds higher over control in Pokkali, while much lesser in IR-29 and PB. The activity of catalase (CAT, EC 1.11.1.6) and superoxide dismutase (SOD, EC 1.15.1.1) were decreased in IR-29 and PB, but unaltered in Pokkali. However, marked drought-induced increase in guaiacol peroxidase (GPX, EC 1.11.1.7) activity was noted in both IR-29 and PB. Induction in radical scavenging activity, being the maximum in IR-29, and increased reducing power ability in all the cultivars, accompanied with drought stress, were observed as a defense mechanism. The novelty of our work is that it showed the aromatic rice PB behaving more closely to IR-29 in greater susceptibility to dehydration stress, while the salt-tolerant Pokkali also showed effective drought tolerance properties.
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Abbreviations
- BSA:
-
Bovine serum albumin
- CAT:
-
Catalase
- DNP:
-
Dinitrophenyl
- DPPH:
-
1, 1-Diphenyl-2-picrylhydrazyl
- GPX:
-
Guaiacol peroxidase
- LOX:
-
Lipoxygenase
- MDA:
-
Malondialdehyde
- PEG:
-
Polyethylene glycol
- SDS:
-
Sodium dodecyl sulfate
- SOD:
-
Superoxide dismutase
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Financial support from Bose Institute and Department of Biotechnology (DBT), Government of India, New Delhi, are gratefully acknowledged.
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Basu, S., Roychoudhury, A., Saha, P.P. et al. Differential antioxidative responses of indica rice cultivars to drought stress. Plant Growth Regul 60, 51–59 (2010). https://doi.org/10.1007/s10725-009-9418-4
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DOI: https://doi.org/10.1007/s10725-009-9418-4