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EFFECTS OF ENZYMATIC CLEAVAGE ON PROLAMELLAR BODIES PROTHYLAKOIDS PREPARED FROM OAT ETIOPLASTS

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Dark-grown Avena sativa L. plants were used to prepare the prolamellar body-pro- thylakoid complex from isolated etioplasts. This complex was treated with proteinsplitting enzymes (trypsin, thermolysin, pronase P) and with enzymes which hydrolize glyco- and phospholipids. Ultrastructural observations showed that proteinases could disconnect prothylakoids from prolamellar bodies. Most of the membranes were completely digested with pronase P, while prolamellar bodies only displayed a loss in the regular tubule arrangement. Phospholipase A2also disturbed the order of prolamellar body tubule connections but the treatment did not destroy tubules or membranes. Incubation of the samples with lipase resulted in complete destruction of prolamellar bodies and also in a considerable destruction of prothylakoids. The cytological observations were supported by protein- and lipid assays. We suggest that prolamellar bodies are glycolipid-enriched outgrowths of prothylakoids which develop when normal thylakoid assembly is disturbed because of prolonged darkness.

Affiliations: 1: Botanisches Institut der Universität Köln

10.1080/0021213X.1984.10676998
/content/journals/10.1080/0021213x.1984.10676998
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/content/journals/10.1080/0021213x.1984.10676998
1984-05-13
2018-09-21

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