Abstract
Drought stress is a global concern that has a negative impact on the growth and production of melon (Cucumis melo L.). In this study, 58 melon accessions were subjected to drought stress induced by polyethylene glycol (PEG-6000). Comprehensive evaluations were performed to identify various morphological, biochemical, and physiological attributes of melon. Drought stress significantly reduced shoot length (SL), stem diameter (SD), leaf width (LW), and leaf length (LL) in the melon seedlings. Similarly, drought stress resulted in a significant reduction in photosynthetic pigments (Chl, Car), relative water content (RWC), chlorophyll fluorescence (Fv/Fm), transpiration rate (Tr), stomatal conductance (Gs), net photosynthetic rate (Pn) and intercellular CO2 concentration (Ci). On the other hand, biochemical indicators such as malondialdehyde content (MDA), soluble protein content (SP) and soluble sugar content (SS) were observed to be enhanced upon exposure to drought stress. Most indicators showed strong positive correlations based on Pearson correlation analysis. Furthermore, the modified membership function and D values for the drought tolerance indices were calculated to evaluate the drought tolerance level of melon accessions. In addition, melon accessions were classified into drought-resistant and drought-sensitive groups based on cluster analysis. As a result, mel-46, mel-58 and mel-15 were identified as drought-resistant genotypes among the assessed melon accessions. Taken together, these accessions provide potential genetic resources for further improvement and breeding of melon genotypes. Furthermore, the indicators responsible for the assessment of drought tolerance can provide a baseline for future studies.
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All data generated or analyzed during this study will be made available on request.
Abbreviations
- PEG:
-
Polyethylene glycol 6000
- DC:
-
Drought-tolerant coefficient
- SL:
-
Shoot length,
- SD:
-
Stem diameter
- LL:
-
Leaf length
- LW:
-
Leaf width
- RWC:
-
Relative water content
- Chl:
-
Chlorophyll content
- Car:
-
Carotenoids
- Fv/Fm:
-
Maximum quantum efficiency of photosystem II photochemistry
- MDA:
-
Malondialdehyde content
- SS:
-
Soluble sugar conten
- SP:
-
Soluble protein content
- Tr:
-
Transpiration rate
- Gs:
-
Stomatal conductance
- Pn:
-
Net photosynthetic rate
- Ci:
-
Intercellular CO2 concentration
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This work was funded by the embarked fund for Shanghai Melon and Watermelon Industry Technical System, China (2017-2021).
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AR & MK: Conceptualization, Methodology, Experimentation, Data analysis, Writing—Original draft. JW & PL: Investigation, Writing—Review & editing. SuR: Conceptualization, Writing—Review & editing. HIS & SG: Visualization, Writing – Review & editing. ST & FN: Data analysis, Validation, Writing—Review & editing. QN: Supervision, Funding Acquisition, Data analysis, Writing—Review & editing. LC: Supervision, Validation, Writing—Review & editing. All authors have read and agreed to the final draft of the manuscript.
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Rehman, A., Khalid, M., Weng, J. et al. Exploring drought tolerance in melon germplasm through physiochemical and photosynthetic traits. Plant Growth Regul 102, 603–618 (2024). https://doi.org/10.1007/s10725-023-01080-3
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DOI: https://doi.org/10.1007/s10725-023-01080-3