Ultrastructural studies on differentiating chloroplasts in the 'forma fuscoviridis' of Ceratozamia mexicana Brongn.*

Autor:	Cinzia Paoletti, Cecilia Marini, Roberta Baroni Fornasiero, Laura Morassi Bonzi, Piera Bonatti
Rok vydání:	1992
Předmět:	Chloroplast Ceratozamia mexicana biology Physiology Plastoglobule Ontogeny Thylakoid Botany Ultrastructure Plant Science biology.organism_classification Cycad Ceratozamia
Zdroj:	New Phytologist. 120:427-434
ISSN:	1469-8137 0028-646X
DOI:	10.1111/j.1469-8137.1992.tb01083.x
Popis:	summary Chloroplast ontogenesis has been examined ultrastructurally in leaflets of ‘forma fuscorviridis’ of Ceratozamia mexicana Brongn., a cycad displaying a dark red-brown colour in young developing leaves. In very young leaves the chloroplasts contain large paracrystalline prolamellar bodies (PLBs), widely extending thylakoid strips, starch, membrane-bounded paracrystals (MbPs) and conspicuous electron-dense plastoglobules (PGBs) densely packed around the PLBs. All these features progressively disappear as the development of the thylakoid system proceeds. In mature leaves the chloroplasts are characterized by randomly orientated grana stacks containing large numbers of thylakoids. The conspicuous presence of different membrane precursors during leaf ontogeny may be associated with the very low rate of leaf development in Ceratozamia.
Databáze:	OpenAIRE
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