Abstract
When leaf discs are water stressed, they lose the capacity for photosynthetic oxygen evolution and variable (chlorophyll a) fluorescence. Such a loss of variable fluorescence was previously reported by Govindjee et al. (Plant Sci. Lett. 20 (1981) 191–194). The later activity is not lost if prior to the water-stress treatment the leaf is incubated with typical water analogs known to act as electron donors to Photosystem II, such as hydroxylamine and hydrazine. Methylamine also acts in the same fashion. These results indicate that one of the sites of drought damage is the oxidizing side of Photosystem II, and that electron donors can restore electron transport, at least to the plastoquinone pool, similar to their effect in Tris treatment of isolated chloroplasts.
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Schedule a callMore From: Biochimica et Biophysica Acta (BBA) - Bioenergetics
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