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Plant Physiology 67:233-236 (1981)
© 1981 American Society of Plant Biologists

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Abscisic Acid and Photosynthesis in Isolated Leaf Mesophyll Cell 1

Bruce T. Mawson2, Brian Colman3 and W. Raymond Cummins2

2 Department of Botany, University of Toronto, Erindale College, Mississauga, Ontario, Canada L5L 1C6, 3 Department of Biology, York University Downsview, Ontario, Canada M3J 1P3

Abscisic acid (AbA) treatments of concentrations of up to 135 micromolar did not inhibit photosynthesis in enzymatically isolated leaf mesophyll cells of Phaseolus vulgaris, Nicotiana tabacum, and Lycopersicum esculentum over periods of up to 5 hours. Thin slices of leaves preincubated in hypertonic solutions identical to those used to isolate cells were shown to synthesize AbA rapidly, although accumulation of AbA in the cells was low due to extensive release of the newly synthesized AbA into the medium. The levels of endogenously made AbA in leaf cells of Phaseolus vulgaris rose from a low of 0.27 micromolar to a high of 6.74 micromolar during 2 hours preincubation. Exogenously applied AbA can be taken up by the cells as was demonstrated using 14[C]AbA. Thus, AbA applied at concentrations 19 times higher than endogenous levels does not change the rate of photosynthesis.

1 This work was supported by Natural Sciences and Engineering Research Council Canada operating grants (to B. C. and W. R. C.).




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P. J. Franks and G. D. Farquhar
The Effect of Exogenous Abscisic Acid on Stomatal Development, Stomatal Mechanics, and Leaf Gas Exchange in Tradescantia virginiana
Plant Physiology, February 1, 2001; 125(2): 935 - 942.
[Abstract] [Full Text]


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Copyright © 1981 by the American Society of Plant Biologists