Non-sulfur purple bacteria fixing nitrogen non-leguminous plants
1993
Vasyuk, L.F. | Khal'chitskij, A.E. | Ivanov, N.S. | Plyushch, A.V.
35 strains of bacteria producing a pink pigment were isolated from the rhizoplane of wheat (Triticum aestivum L.) and rice (Oryza sativa L.) whose seeds were treated after germination with diluted extract of soils: 1) loess-like loam from Germany; 2) chernozem-like meadow soil from the estuary of the river Kuban; 3)derno-podzolic soil on the carbonate sub-soil of the Leningrad area. An investigation of morphological, cultural, phisiological and biochemical properties, and of the GS content in the DNA of these bacteria as well of the DNA-DNA homology between them and representative strain of a number of bacterial species provided evidence for classification of the isolates into the genus Rhodobacter, and they proved especially close to Rhodobacter spaeroides. They were established to possess nitrogenase activity in vitro and in association with plants in situ. Only part of the strains tested proved capable of anaerobe photosynthesis. Some representatives of the bacterial group studied exerted a stimulatory influence on the accumulation of rice biomass and the increase of nitrogen content of two wheat sort grown under experimental conditions
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