Plant Physiol.
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Plant Physiology 98:1228-1232 (1992)
© 1992 American Society of Plant Biologists

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Environmental and Stress Physiology

Effects of Abscisic Acid Treatment on the Thermostability of the Photosynthetic Apparatus in Barley Chloroplasts 1

Alexander G. Ivanov, Maia I. Kitcheva, Alexander M. Christov and Losanka P. Popova

Central Laboratory of Biophysics, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Building 21, 1113 Sofia, Bulgaria, Institute of Plant Physiology, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Building 21, 1113 Sofia, Bulgaria

Thermostability of the photosynthetic apparatus of abscisic acid (ABA)-treated seedlings of barley (Hordeum vulgare) was studied by light-scattering and by fluorescence measurements of isolated chloroplasts. ABA treatment markedly decreased heat damage of the chloroplast ultrastructure; an exogenous ABA concentration of 10–5 molar was most effective. Heat-induced increase of the 77 kilodalton fluorescence ratio F740/F685 was also smaller at this ABA concentration. The heat-induced increase of the initial chlorophyll fluorescence level (Fo) was virtually eliminated in ABA-treated (10–5 molar) chloroplasts up to 45°C and slightly increased at 50°C, relative to control chloroplasts where Fo increased even at 35°C and reached its maximal value at 45°C. In control chloroplasts, Fo increased with a 5-minute pretreatment temperature, an effect observed as low as 35°C. Fo was maximal at 45°C. In contrast, chloroplasts treated with 10–5 molar ABA did not exhibit a heat-induced increase in Fo until 50°C.

1 This work was supported by the Institute of Plant Physiology and by the Bulgarian Ministry of Science and High Education under research contract No. 519.






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