Abstract
Responses of two muskmelon (Cucumis melo L.) genotypes (drought tolerant SC-15 and drought susceptible EC-564755) were analyzed at 0, 7, 14, and 21 d of progressive water stress. Although water deficit caused a significant decline in relative water content, the magnitude of reduction was lower in SC-15. Electrolyte leakage, hydrogen peroxide, and malonydialdehyde generation were higher in EC-564755, whereas accumulation of proline was higher in SC-15. Higher activities of antioxidant enzymes, such as catalase, superoxide dismutase, ascorbate peroxidase, guaiacol peroxidase, and glutathione reductase, and higher expression of the respective genes were recorded in SC-15 than in EC-564755. Expressions of DREB2C and DREB3 in SC-15 revealed a fluctuating pattern with down-regulation on days 7 and 21 of water stress, whereas up-regulation was observed on day 14. Concurrently, both genes in EC-564755 showed continuous down-regulation on days 7, 14, and 21 of water stress. Expressions of RD22 and dehydrin recorded on days 7, 14, and 21 were lower in SC-15. The cluster analysis showed that, these two genotypes had a clear distinction in physiological and biochemical properties and gene expressions under water stress and the genotype SC-15 had more efficient osmoprotectant mechanism than genotype EC-564755 under water deficit conditions.
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Abbreviations
- APX:
-
ascorbate peroxidase
- CAT:
-
catalase
- DREB:
-
dehydration-responsive element-binding
- MDA:
-
malondialdehyde; nding protein
- DWD:
-
days of water deficit
- EL:
-
electrolyte leakage
- GR:
-
glutathione reductase
- LPO:
-
lipid peroxidation
- POD:
-
guaiacol peroxidase
- RWC:
-
relative water content
- SOD:
-
superoxide dismutase
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Acknowledgement: The authors acknowledge the generous support of the National Agricultural Innovation Project (NAIP), New Delhi. MAN-JRF-SRF provided to WAA by University Grant Commission (UGC), New Delhi, India, is fully acknowledged.
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Ansari, W.A., Atri, N., Singh, B. et al. Changes in antioxidant enzyme activities and gene expression in two muskmelon genotypes under progressive water stress. Biol Plant 61, 333–341 (2017). https://doi.org/10.1007/s10535-016-0694-3
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DOI: https://doi.org/10.1007/s10535-016-0694-3