Thesis (Ph.D), University of East Anglia, School of Biological Sciences, 1989.
Nodulation is a host-specific process with each rhizobium having a defined host-plant range (Table ). Rhizobia, normally found in the soil, respond to the plant-root environment (rhizosphere) by increasing their population levels and attaching to the root surface. Regulation of nodulation gene expression by are host plants for Rhizobium leguminosarum biovar nodD genes (3, 22, 35, 56), analysis of inducible nod gene transcription in of by Author: H R Schlaman, R J Okker, B J Lugtenberg. Abstract. This review focuses on the functions of nodulation (nod) genes in the interaction between rhizobia and nod genes are the key bacterial determinants of the signal exchange between the two symbiotic partners. The product of the nodD gene is a transcriptional activator protein that functions as receptor for a flavonoid plant by: G. Stacey, in Encyclopedia of Genetics, Rhizobium leguminosarum bv. viceae provides perhaps the simplest regulatory model for nod gene expression, where a single nodD gene is present. Mutations of this gene result in the complete loss of nodulation ability. However, nod gene expression in most other rhizobia is controlled in a much more complex way. An .
The Rhizobium leguminosarum nodulation gene nodF encodes a polypeptide similar to an acyl-carrier protein and is regulated by nodD plus a factor in pea root exudate. Embo J. 5: – Embo J. 5: –Cited by: 2. Nodulation and symbiotic nitrogen fixation are mediated by several genes, both of the host legume and of the bacterium. The rhizobial regulatory nodD gene plays a critical role, orchestrating the transcription of the other nodulation genes. Rhizobium tropici strain CIAT is an effective symbiont of several legumes—with an emphasis on common bean (Phaseolus Cited by: Abstract. Bacteria of the genus Rhizobium, which are able to establish a symbiosis with leguminous plants, invade the roots of their hosts where they induce the formation of nodules in which they fix atmospheric Rhizobium strain has only a narrow range of host plants on which it is successfully able to establish a symbiosis. In fast-growing Rhizobia, which Cited by: 8. A hybrid nodD gene consisting of 75% of the nodD1 gene of Rhizobium meliloti at the 5' end and 27% of the nodD gene of Rhizobium trifolii at the 3' end activates the six tested inducible nod.
Abstract. Our long term goals are to study the interaction of Rhizobium and plants at the molecular and cellular levels. Our system of study is Rhizobium meliloti and its host plants such as alfalfa (Rhizobium meliloti and its host plants such as alfalfaCited by: 4. Genetic analysis of a nodA-nodD region of autochthonous strains of Rhizobium leguminosarum biovar viciae that showed effective nodulation of host plants Abstract Two autochthonous strains of R. leguminosarum bv. viciae, designated ZG and ZG, were isolated from large and numerous root nodules ofCited by: 1. Morphology. Rhizobium leguminosarum is a Gram-negative, motile, rod-shaped, aerobic bacterium.. Common biovars. R. leguminosarum biovar trifolii, and R. leguminosarum biovar viciae are the most commonly studied biovars of R. leguminosarum, with certain studies seemingly treating R. trifolii as its own species.. Uses. Research has been carried out into the Class: Alphaproteobacteria. Direct amplification of nodD from community DNA reveals the genetic diversity of Rhizobium leguminosarum in soil Adolphe ZeÂzeÂ, Lesley A. Mutch and J. Peter W. Young* Department of Biology, University of York, PO Box , York YO10 5YW, UK. Summary Sequences of nodD, a gene found only in rhizobia, were amplified from total community DNA isolated.