Vitamin B12 as a Growth Factor for Soil Bacteria

Autor:	A. G. Lochhead, R. H. Thexton
Rok vydání:	1951
Předmět:	Rhizosphere Multidisciplinary Bacteria Biology Soil type biology.organism_classification Soil management Soil Vitamin B 12 Soil water Botany Corrinoids Intercellular Signaling Peptides and Proteins Yeast extract Food science Vitamin B12 Soil microbiology
Zdroj:	Nature. 167:1034-1034
ISSN:	1476-4687 0028-0836
DOI:	10.1038/1671034a0
Popis:	STUDIES of the nutritional requirements of soil bacteria isolated on a non-selective basis1 have shown the presence of a well-defined group of organisms dependent upon soil extract for maximum growth. These bacteria show no growth, or at best sub-maximal growth, in media containing sugars and inorganic salts, supplemented by yeast extract or combinations of amino-acids and vitamins (not including B12). Though the relative incidence of this group may vary with the soil type, soil management and the season2, the chief factor affecting the proportion of these organisms is believed to be the growing plant, investigations with a variety of crops3,4 having shown a lowered relative incidence in the rhizosphere, attributable to a preferential stimulation by the plant root of bacteria with simpler nutritional needs. However, in soil beyond the zone of influence of the root, this group has been found to comprise 8–35 per cent of the bacteria in the soils examined.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2755650f8155ad07f37bd59eb1fa3521 https://doi.org/10.1038/1671034a0 Zobrazit plný text záznamu