Abstract
Protoplasts from spinach leaves exhibit a light-induced Ca2+ influx. The half maximum rate of Ca2+ influx is achieved at ~ 5 Wm-2. The action spectrum of this influx is similar to that of photosynthesis. Furthermore, light-induced Ca2+ influx is abolished by DCMU (≥ 0.5 μᴍ) and is sensitive to the uncoupler FCCP. Vanadate up to 3 μᴍ enhances light-induced Ca2+ influx. These data indicate that photosynthetic electron transport is involved in light-induced Ca2+ influx into spinach protoplasts.
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