Antioxidant system and photosynthetic characteristics responses to short-term PEG-induced drought stress in cucumber seedling leaves

The effect of short-term drought stress on the water content, antioxidant system and photosynthetic characteristics was investigated using cucumber ( Cucumis sativus L.) seedlings. The results indicated that polyethylene glycol induced water stress reduced water content in shoots of cucumber seedlin...

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Bibliographic Details
Published in:Russian journal of plant physiology 2017-03, Vol.64 (2), p.162-173
Main Authors: Fan, H. F., Ding, L., Xu, Y. L., Du, C. X.
Format: Article
Language:English
Subjects:
Ascorbic acid
Biomedical and Life Sciences
Carbon dioxide
Catalase
Conductance
Drought
Electrolyte leakage
Glutathione
Glutathione reductase
Hydrogen peroxide
L-Ascorbate peroxidase
Leakage
Leaves
Life Sciences
Malondialdehyde
Metabolism
Moisture content
Peroxidase
Photochemistry
Photosynthesis
Photosystem II
Plant growth
Plant Physiology
Plant Sciences
Polyethylene glycol
Polyethylenes
Quenching
Research Papers
Resistance
Seedlings
Shoots
Stomata
Stress concentration
Superoxide
Transpiration
Water absorption
Water content
Water stress
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Summary:The effect of short-term drought stress on the water content, antioxidant system and photosynthetic characteristics was investigated using cucumber ( Cucumis sativus L.) seedlings. The results indicated that polyethylene glycol induced water stress reduced water content in shoots of cucumber seedling after treatment of 36 hours, and caused obvious reductions in net photosynthetic rate, stomatal conductance, intercellular CO 2 concentration and transpiration of leaves. In addition, water stress significantly reduced the photosynthetic pigment content and inhibited photochemical activity, including actual photochemical efficiency, maximal quantum yield of photosystem II photochemistry and coefficient for photochemical quenching. Meanwhile non-photochemical quenching increased. As responses to drought stress, significant increases in electrolyte leakage, malondialdehyde, superoxide anion and hydrogen peroxide levels were detected in leaves. The superoxide dismutases, catalase, glutathione reductase and dehydroascorbate reductase activities, protein, ascorbate and glutathione content, all decreased and peroxidases activity increased, while ascorbate peroxidase and monodehydroascorbate reductase activities exhibited different trend under different degree of water stress. Therefore, it can be concluded that water stress strongly disrupted the normal metabolism of leaves and restrained water absorption.
ISSN:1021-4437
1608-3407
DOI:10.1134/S1021443717020042