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 (P N ), stomatal conductance (g s ), and transpiration rate (E). At 8 and 24 h, the lower P N in trehalose-treated plants was accompanied by significant decrease in intercellular CO 2 concentration (c i ) suggesting that the reduction of P N was caused by stomatal limitation. At 48 and 72 h, trehalose decreased apparent carboxylation efficiency (P N /c i ) and did not decrease c i and g s 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 (Φ PSII ) and did not affect maximum photochemical efficiency of PS II (F v /F m ). 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.
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