Evolution de la structure plastidiale et des reserves polysaccharidiques au cours de la déshydratation des gamétophytes feuillés duPolytrichum formosumHedw. (Polytrichales)

Autor:	K. S. Mansour, J.N. Hallet, F. M. Lecocq
Rok vydání:	1987
Předmět:	Gametophyte biology Starch food and beverages Plant Science biology.organism_classification medicine.disease Moss chemistry.chemical_compound chemistry Botany medicine Ultrastructure Dehydration Plastid Desiccation Leafy Ecology Evolution Behavior and Systematics
Zdroj:	Journal of Bryology. 14:765-777
ISSN:	1743-2820 0373-6687
Popis:	The effects of a 24 h dehydration period on plastid ultrastructure and their starch content have been studied on the leafy gametophyte of a poikilohydrous moss Polytrichum formosum Hedw. It has been shown that desiccation induces a swift resorption of the starch grains in the plastids of the meristematic cells of the shoot apex without any major disorganisation of the thylakoids. However starch grains are preserved in the dehydrated tissues of the adult leaves. The starch hydrolysis is continued with a marked increase of the sucrose concentration to this may be attributed an osmoregulatory role in the first stages of the water loss. Upon rehydration the plastid ultrastructure is entirely restored with new starch inclusions appearing in less than 4 h.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::9734bb15d3a04b7f082eead260979df1 https://doi.org/10.1179/jbr.1987.14.4.765 Zobrazit plný text záznamu