Abstract
Drought stress is a major threat to plant production in semi-arid and arid areas of the world. This research was laid out to asses the effects of sodium nitroprusside (SNP) as a nitric oxide donor on growth, physiological and biochemical changes of in vitro-cultured Allium hirtifolium under polyethylene glycol (PEG) induced drought stress. Basal plate explants of A. hirtifolium were cultured on MS medium containing different levels of PEG (0, 2, 4, 8 and 16 mM) and SNP (0, 10, 40 and 70 µM). After prolonged drought, growth responses, oxidative stress indicators, and phytochemical variations of regenerated plantlets with or without PEG and/or SNP treatments were recorded. Water limitation reduced regeneration potential of explants and consequently number of shoots per explant. Relative water content, total chlorophyll and carotenoid contents of regenerated A. hirtifolium plantlets decreased, but accumulation of malondialdehyde, H2O2 and proline and the activities of superoxide dismutase, ascorbate peroxidase, catalase and peroxidase enzymes increased with decreasing water availability. Total phenol and allicin contents were also increased in response to drought stress. Exogenous SNP in 10 and particularly in 40 µM was effective in enhancing regeneration rate and relative water content as well as protecting photosynthetic pigments under different levels of water availability. SNP also inhibited the hydrogen peroxide (H2O2) accumulation and lipid peroxidation in cell membranes via increasing the activities of superoxide dismutase and ascorbate peroxidase enzymes and accumulating proline and allicin. In general, these results suggest that exogenous SNP at 40 µM not only could somewhat protect A. hirtifolium from drought stress, but also can help to improve the propagation and allicin production of that plant under in vitro condition.
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Abbreviations
- APX:
-
Ascorbate peroxidase
- CAT:
-
Catalase
- NO:
-
Nitric oxide
- PEG:
-
Polyethylene glycol
- POX:
-
Peroxidase
- PGR:
-
Plant growth regulator
- ROS:
-
Reactive oxygen species
- RWC:
-
Relative water content
- SNP:
-
Sodium nitroprusside
- MDA:
-
Malondialdehyde
- SOD:
-
Superoxide dismutase
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We appreciate the financial support of this work by the University of Tabriz.
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Communicated by Sergio J. Ochatt.
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Ghassemi-Golezani, K., Farhadi, N. & Nikpour-Rashidabad, N. Responses of in vitro-cultured Allium hirtifolium to exogenous sodium nitroprusside under PEG-imposed drought stress. Plant Cell Tiss Organ Cult 133, 237–248 (2018). https://doi.org/10.1007/s11240-017-1377-2
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DOI: https://doi.org/10.1007/s11240-017-1377-2