Zinc mediated effects on leaf CO2 diffusion conductances and net photosynthesis in Phaseolus vulgaris L. |
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Authors: | F Van Assche R Ceulemans H Clijsters |
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Institution: | (1) Limburgs Universitair Centrum, dept. SBM, Universitaire Campus, B-3610 Diepenbeek, Belgium;(2) Present address: dept. Biology, Universitaire Instelling Antwerpen, Universiteitsplein 1, B-3610 Wilrijk, Belgium |
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Abstract: | Supra-optimal levels of zinc in primary leaves of Phaseolus vulgaris increased the CO2 compensation point and inhibited net photosynthesis. Leaf morphology was modified: mesophyll intercellular area, stomatal slit length and interstomatal distance were reduced, but stomatal density increased. Internal and stomatal conductances to CO2 diffusion decreased. These changes are discussed in relation to the observed effects on leaf gas exchange and to the previously reported inhibition of different photosynthetic and photorespiratory enzymes. |
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Keywords: | leaf conductance Phaseolus vulgaris photosynthesis zinc |
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