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Effects of Cations and Abscisic Acid on Chlorophyll a Fluorescence in Guard Cells of Vicia faba

Teruo Ogawa, David Grantz, John Boyer, Govindjee
Teruo Ogawa
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David Grantz
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John Boyer
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Govindjee
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Published May 1982. DOI: https://doi.org/10.1104/pp.69.5.1140

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  • © 1982 American Society of Plant Biologists

Abstract

The effects of cations and abscisic acid on chloroplast activity in guard cells of Vicia faba were investigated by analysis of the transient of chlorophyll a fluorescence. When epidermal strips containing guard cells as the only living cells were incubated in water and illuminated with strong light, chlorophyll a fluorescence rose rapidly to a high intensity and then declined slowly to a stationary level. The rate of this decline was enhanced by K+ or Na+, and the effect of these cations was greater when added with phosphate than with chloride as the anion. Ca2+ suppressed the enhancement by Na+ and, to a lesser extent, that by K+. Abscisic acid also suppressed the enhancement by K+ and Na+. Since the fluorescence decline reflects the increase of intrathylakoid H+ concentration necessary for photophosphorylation, the acceleration of the decline by K+ (or Na+ in the absence of Ca2+) implicates chloroplast activity in ion accumulation by guard cells in the light. The differential effects of phosphate and chloride suggest that chloroplast activity may be involved in malate formation in guard cells in the light.

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Effects of Cations and Abscisic Acid on Chlorophyll a Fluorescence in Guard Cells of Vicia faba
Teruo Ogawa, David Grantz, John Boyer, Govindjee
Plant Physiology May 1982, 69 (5) 1140-1144; DOI: 10.1104/pp.69.5.1140

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Effects of Cations and Abscisic Acid on Chlorophyll a Fluorescence in Guard Cells of Vicia faba
Teruo Ogawa, David Grantz, John Boyer, Govindjee
Plant Physiology May 1982, 69 (5) 1140-1144; DOI: 10.1104/pp.69.5.1140
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Plant Physiology
Vol. 69, Issue 5
May 1982
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