Abstract
The properties of reaction centers are compared in plants and in photosynthetic bacteria. The comparison emphasizes the Q B (and herbicide) binding site in PS II and purple bacteria, and the sequence of electron acceptors in PS I and green sulfur bacteria. Evolutionary implications are discussed, with the point of view that reaction centers of the purple bacterial type are more ancient and that centers with low-potential acceptors (green sulfur bacteria, Gram-positive bacteria, PS I) have developed more recently.
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