Azospirillum VI and Related Microorganisms: Genetics — by Johanna Döbereiner, Vera L. D. Baldani, Veronica M. Reis

By Johanna Döbereiner, Vera L. D. Baldani, Veronica M. Reis (auth.), Istvà n Fendrik, Maddalena del Gallo, Jos Vanderleyden, Miklos de Zamaroczy (eds.)

Azospirillum is a plant development selling rhizobacterium used for inoculation of cereal and forage vegetation. The e-book covers its body structure, ecology, biochemistry, and molecular biology. the main complicated molecular concepts to appreciate the regulatory mechanisms of nitrogen fixation and ammonia assimilation, in addition to the root of phytohormone creation, are integrated. specifically, the identity of novel kinds of promoters, particular regulatory circuits, and new regulatory proteins is defined. New insights within the plant development selling function of the micro organism during the research in their interactions with the plant are provided. additionally mentioned are box purposes, permitting the overview of the physiological and agronomic involvement of Azospirillum inoculations.

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Extra info for Azospirillum VI and Related Microorganisms: Genetics — Physiology — Ecology

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FDEPT8ALDfELRHEV'LKVHQ '" 100 ................ 200 180 180 W~B 262 242 240 Figure 2. Physical and genetic map of an A. brasilense operon (A) that shows high homology with the E. coli gin HPQ operon. Amino acid alignment is given for GlnQ (B). Sequence analysis of this operon shows significant homology with the E. , 1986) and to a lesser extent with the his operon. These operons are expressed under nitrogen-limiting conditions and encode high-affinity transport systems for glutamine and histidine respectively, and belong to the class of ATP-Binding-Cassette (ABC) transporters.

Mol. Gen. Genet. 125:341-350 Papp I,Dorgai L, Papp P, Jonas E, Olasz F, Orosz L (1993) The bacterial attachment site of temperate Rhizobium phage 16-3 overlaps the 3' end of a putative proline tRNA gene. Mol. Gen. Genet. 240:258-264 Putnoki P, Petrovics G, Kereszt A, Grosskopf E, Dang thi Cam Ha, Banfalvi Z, Kondorosi A (1990) Rhizobium meliloti lipopolysaccharide and exopolysaccharid can have the same function in the plant-bacterium interaction. J. Bacteriol. 172:5450-5458 Sik T, Barabas I (1977) The correlation of nitrate reductase and nitrogenase in Rhizobium symbiosis.

1 2 3 4 5 6 7 6 9 10 fractions Fractionation on Sephadex G-50 Chemotaxis activIty of fractions Bactenum 2-3 4-5 6-7 8-10 R. meliloti 41 2 13 22 3 R. meliloti 18 5 9 19 3 R. leguminosarum - 4 6 7 4 - R. tri/olii Figure 6 Attractant activity of fractionated alfalfa root exudate. Chemotaxis coefficient (K) of unfractionated exudate was 16 and 18 with R. meliloti 41 and R. meliloti 18 respectively. 41 In the exudates besides flavonoids also amino acids are inducing chemotaxis, but with lower specific activity (Ponyi, unpublished).

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Azospirillum VI and Related Microorganisms: Genetics — by Johanna Döbereiner, Vera L. D. Baldani, Veronica M. Reis
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