Abstract
The supply of energy for stomatal opening was investigated with epidermal peels of Commelina communis L. and Vicia faba L., under white, blue and red irradiation or in darkness. Fluencerate response curves of stomatal opening under blue and red light were consistent with the operation of two photosystems, one dependent on photosynthetic active radiation (PAR) and the other on blue light, in the guard cells. The PAR-dependent system was 3(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU)-sensitive and KCN-resistant and showed a relatively high threshold irradiance for its activation; its activity was most prominent at moderate to high irradiances. The blue-light-dependent photosystem was KCN-sensitive, was active at low irradiances, and interacted with the PAR-dependent photosystem at high blue irradiances. Stomatal opening in darkness, caused by CO2-free air, fusicoccin or high KCl concentrations, was KCN-sensitive and DCMU-resistant. These data indicate that stomatal opening in darkness depends on oxidative phosphorylation for the supply of high-energy equivalents driving proton extrusion. Light-dependent stomatal opening appears to require photophosphorylation from guard-cell chloroplasts and the activation of the blue-light photosystem which could rely either on oxidative phosphorylation or a specific, membrane-bound electron-transport carrier.
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Abbreviations
- DCMU:
-
3(3,4-dichlorophenyl)-1-1-dimethylurea
- FC:
-
fusicoccin
- KCN:
-
potassium cyanide
- PAR:
-
photosynthetic active radiation
- WL:
-
white light
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Schwartz, A., Zeiger, E. Metabolic energy for stomatal opening. Roles of photophosphorylation and oxidative phosphorylation. Planta 161, 129–136 (1984). https://doi.org/10.1007/BF00395472
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DOI: https://doi.org/10.1007/BF00395472