Colonization of wheat Triticum vulgare L.) by N2-fixing cyanobacteria: I. A survey of soil cyanobacterial isolates forming associations with roots

Autor:	Nigel W. Kerby, Z. Obreht, Peter Rowell, Miroslav Gantar
Rok vydání:	1991
Předmět:	Cyanobacteria Nostoc biology Physiology Anabaena Nitrogenase Plant Science Root hair biology.organism_classification Botany Nitrogen fixation bacteria Poaceae Cylindrospermum
Zdroj:	New Phytologist. 118:477-483
ISSN:	1469-8137 0028-646X
DOI:	10.1111/j.1469-8137.1991.tb00030.x
Popis:	summary A variety of heterocystous, N2-fixing cyanobacteria, isolated from soils, were identified as members of the genera Nostoc, Anabaena and Cylindrospermum. These isolates were tested for their ability to form associations with the roots of wheat seedlings grown in liquid culture. Two types of associations were recognized: loose associations with cyanobacterial filaments growing between root hairs, which were typical of the Anabaena isolates, and tight associations of microcolonies in intimate association with the root surface, which were restricted to certain Nostoc isolates. Differences in nitrogenase activities of the free-living and associated cyanobacteria, together with the effects of added nitrate, indicate that nitrogenase activity may be influenced by the plant and/or its products.
Databáze:	OpenAIRE
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