Abstract
Trehalose can reduce stomatal aperture by a hydrogen-peroxide-dependent pathway in Vicia faba L. (cv. Daqingpi) resulting in significantly lower values of net photosynthetic rate (PN), stomatal conductance (gs), and transpiration rate (E). At 8 and 24 h, the lower PN in trehalose-treated plants was accompanied by significant decrease in intercellular CO2 concentration (ci) suggesting that the reduction of PN was caused by stomatal limitation. At 48 and 72 h, trehalose decreased apparent carboxylation efficiency (PN/ci) and did not decrease ci and gs compared with controls; therefore the reduction in photosynthesis was caused by non-stomatal limitation. Trehalose treatment resulted in significantly higher effective photochemical efficiency of PS II (ΦPSII) and did not affect maximum photochemical efficiency of PS II (Fv/Fm). At 24, 48, and 72 h, trehalose decreased non-photochemical quenching (NPQ) and increased photochemical quenching (qP). Our results suggest that trehalose did not damage photosynthetic reaction centers.
Abbreviations
- ABA:
-
abscisic acid
- c a :
-
ambient CO2 concentration
- ci :
-
intercellular CO2 concentration
- E:
-
transpiration rate
- Fv/Fm :
-
variable to maximum fluorescence ratio (maximum photochemical efficiency of photosystem II)
- gs :
-
stomatal conductance
- NPQ:
-
non-photochemical quenching
- PAR:
-
photosynthetically active radiation
- PN :
-
net photosynthetic rate
- PN/ci :
-
apparent carboxylation efficiency
- qP:
-
photochemical quenching
- ROS:
-
reactive oxygen species
- TPP:
-
trehalose phosphate phosphatase
- TPS:
-
trehalose phosphate synthase
- ΦPS2 :
-
effective photochemical efficiency of PS II
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Acknowledgements: This work was financed by National High Technology Research and Development Program of China (2011AA100503). The first two authors contributed equally to this study.
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Gao, J., Wang, N., Xu, S.S. et al. Exogenous application of trehalose induced H2O2 production and stomatal closure in Vicia faba . Biol Plant 57, 380–384 (2013). https://doi.org/10.1007/s10535-012-0285-x
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DOI: https://doi.org/10.1007/s10535-012-0285-x