Effects of Mannose on Photosynthetic Gas Exchange in Spinach Leaf Discs
Authors:
- John K. CheesbroughJCJohn K. Cheesbrough
- David A. WalkerDWDavid A. Walker
Open Access
- 1 January 1983
- journal article
- research article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 71 (1) , 108-111
Abstract
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.Keywords
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