Utrastructural analysis of plastid degeneation in an ethyl methanesulfonate-induced mutant of Mimulus

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Abstract
In an investigation of the ultrastructural anomalies of an EMS-induced chloroplast mutant of Mimulus cardinalis, it was found that three stages of chloroplast degeneration (so-called photobleaching) may be recognised. These stages corrospond well with Knoth's model for plastid destruction in plastome mutants deficient in photosystem I.