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- W2125710028 abstract "In broad bean (Vicia faba L.), an apoplastic phloem loader, the sucrose concentration increases up to approximately 2 mM in the leaf apoplast and up to approximately 150 mM in the guard-cell apoplast during the photoperiod. This high concentration in the guard-cell apoplast results from transpiration and is sufficient osmotically to reduce stomatal aperture size by up to 3 microm or approximately 25% of the maximum aperture size. In this paper, we investigated a parallel and required role for high bulk-leaf apoplastic sucrose concentration, which correlates with high photosynthesis rate. An empirically determined combination of lowered light intensity and lowered CO(2) concentration reduced the photosynthesis rate to nominally one-fifth of the control value without a significant change in transpiration. This reduction in photosynthesis caused the sucrose concentration in the leaf apoplast--the immediate source pool for guard cells--to decrease by 70% (to 0.4 mM). In turn, sucrose concentration in the guard-cell apoplast decreased by approximately 80% (to approximately 40 mM). These results complete the required evidence for a non-exclusive, transpiration-linked, photosynthesis-dependent passive mechanism for the modulation of stomatal aperture size. In an ancillary investigation, hexoses in the bulk-leaf apoplast decreased when photosynthesis was lowered, but their concentrations in the guard-cell apoplast of control plants indicated that their osmotic contribution was negligible." @default.
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- W2125710028 date "2007-05-01" @default.
- W2125710028 modified "2023-10-11" @default.
- W2125710028 title "Guard-cell apoplastic sucrose concentration ? a link between leaf photosynthesis and stomatal aperture size in the apoplastic phloem loader Vicia faba L." @default.
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- W2125710028 doi "https://doi.org/10.1111/j.1365-3040.2007.01635.x" @default.
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