CHLOROPLAST REDUCTIONS. “Membrane systems of chloroplasts featuring single thylakoids (stromal lamellae) and only small grana stacks have been proposed to serve to limit the quantity of solar radiation reaching photosynthetic pigment-protein complexes and to provide adaptation to high level of insolation…in plants of Pamir growing under high light conditions and low temperatures, chloroplasts contain mainly single thylakoids and small grana consisting of 2–4 thylakoids.”
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