Abstract
Cucumber (Cucumis sativus L.) seeds were pretreated with exogenous abscisic acid (ABA) prior to germination. After germination, seedlings with three leaves were exposed to gradual dehydration. The effects of ABA on photosynthetic rate (Pn), daily water loss (WL) and water utilization efficiency (WUE) during dehydration were investigated, in addition to the variation of carbohydrates in leaves. ABA improved the Pn, WL and WUE of cucumber seedlings during dehydration. After rehydration, the seedlings pretreated with ABA showed a higher recovery in Pn, WL and WUE, as compared to those without an ABA pretreatment. Subsequent to dehydration, concentration of stachyose, raffinose, sucrose, glucose, and fructose increased in seedlings pretreated with ABA. Dehydration altered the proportions of the sugars in the total carbohydrates, and accelerated the accumulation of stachyose, raffinose and sucrose. After rehydration, carbohydrate concentrations of seedlings pretreated with ABA recovered to levels observed prior to dehydration. These results demonstrated that pretreatment of seeds with exogenous ABA enhanced carbohydrate tolerance to dehydration of cucumber seedlings.
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Abbreviations
- RFOs:
-
Raffinose family oligosaccharides
- ABA:
-
Abscisic acid
- PPFD:
-
Photosynthetic photon flux density
- Pn:
-
Photosynthetic rate
- Tr:
-
Transpiration rate
- WL:
-
Water lost every day
- WUE:
-
Water utilization efficiency
- ND:
-
No ABA pretreatment and natural dehydration
- AD:
-
ABA pretreatment and natural dehydration
- NAND:
-
No ABA pretreatment and no dehydration all the time
- FW:
-
Fresh weight
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Acknowledgments
This work was supported by the National Key Technologies Research and Development (R & D) Program of China (2006BAD07B04, 2007BAD69B06), the Key Program of Agricultural Ministry in China (nyhyzx07-007) and the earmarked fund for Modern Agro-industry Technology Research System. The authors are indebted to Yang Liu for her work during the experiment. The anonymous reviewing editors and reviewers are gratefully thanked for their constructive comments.
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Wang, S., Hu, L., Sun, J. et al. Effects of exogenous abscisic acid on leaf carbohydrate metabolism during cucumber seedling dehydration. Plant Growth Regul 66, 87–93 (2012). https://doi.org/10.1007/s10725-011-9632-8
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DOI: https://doi.org/10.1007/s10725-011-9632-8