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Effects of Mannose on Photosynthetic Gas Exchange in Spinach Leaf Discs ¹

Biology Department, Wellesley College, Wellesley, Massachusetts 02181, A.R.C. Research Group on Photosynthesis, Department of Botany, University of Sheffield, Sheffield S10 2TN England

When mannose is provided in the transpiration stream to spinach (Spinacia oleracea) leaf discs, a series of specific and nonspecific changes occur in CO₂ and H₂O vapor exchange as a function of feeding time. The initial increases in apparent photosynthesis and transpiration are nonspecific effects due to osmotic changes leading to passive stomatal opening. The mannose-specific effects are: (a) time-dependent changes in the CO₂ concentration required for saturation; (b) complex kinetics of the inhibition of CO₂ assimilation dependent on CO₂ and O₂ concentrations and the duration of feeding (high CO₂ and low O₂ lead to rapid inhibitions of photosynthesis); (c) elimination of the capacity of 2% O₂ to stimulate photosynthesis; and (d) oscillations in the CO₂ exchange rate following transitions from 20% to 2% O₂. The mannose-specific effects are reversible by orthophosphate. The mannose-dependent changes in gas exchange are attributed to altered [ATP]/[ADP] ratios.

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