By Peter van Berkum, Bertrand D. Eardly (auth.), Herman P. Spaink, Adam Kondorosi, Paul J. J. Hooykaas (eds.)
The Rhizobiaceae, Molecular Biology of version Plant-Associated micro organism. This ebook offers a accomplished review on our current molecular organic wisdom concerning the Rhizobiaceae, which at the moment will be known as the best-studied kin of soil micro organism. for lots of centuries they've got attracted the eye of scientists due to their capability to go along with vegetation and thus additionally to in particular regulate plant improvement. a few of these institutions are precious for the plant, as is the case for the Rhizobiaceae subgroups jointly referred to as rhizobia, that are capable of repair nitrogen in a symbiosis with the plant hosts. This symbiosis ends up in the fonnation of root or stem nodules, as illustrated at the entrance disguise. by contrast, numerous Rhizobiaceae subgroups can negatively impact plant improvement and evoke plant ailments. Examples are Agrobacterium tumefaciens andA. rhizogenes which set off the formation of crown galls or bushy roots at the stems in their host crops, respectively (bottom panels on entrance cover). as well as the most obvious value of reviews at the Rhizobiaceae for agronomy, this study box has led to the invention of many primary medical rules of normal curiosity, that are highlighted during this ebook. to say 3 examples: (i) the invention of DNA move of A.
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Additional resources for The Rhizobiaceae: Molecular Biology of Model Plant-Associated Bacteria
Van Berkum and Eardly 10 100 98 - . " . It'. fI',, .... Ii. c: ~ 94 t2H :::> U) U) 92 - • ••• 90 88 0 20 40 60 80 100 DNA-DNA reassociation Figure 3. Comparison of small subunit rRNA homology and DNA-DNA reassociation values among members of the Rhizobiaceae. 1. Agrobacterium (Conn, 1942) Originally Agrobacterium species were classified according to their phytopathogenicity and also were divided based upon the production of 3-ketolactose. Non-pathogenic species were A. radiobacter, those causing hairy root were classified as A.
Sesbania rostrata is one of the few existing stem-nodulating legumes. , 1983). , 1993; Willems 1993). Only one species, and Collins, A. , 1988). , (1991) reported that Azorhizobium could be divided into two genomic species, but refrained from naming the second species because they were unable to identify phenotypic characters which differentiated the two. , 1988). 2% sequence similarities of the SSU rRNA genes (Rainey and Wiegel, 1996). , (1988) conceded that the level of similarity they described between the rRNA cistrons of Azorhizobium and Xanthobacter did not reflect their separate genus status, but argued that several morphological and biochemical 13 differences justified such a separation.
However, fatty acid-methyl ester analysis of strains of American origin and those from South-East Asia have indicated the existence of a fourth grouping besides B. japonicum I, Ia, and B. , 1995). SSU rRNA gene nucleotide sequence analyses with the slow-growing legume symbionts have indicated the presence of two lineages within the genus Bradyrhizobium. One of the branches centers around Rhodopseudomonas palustris and contains B. japonicum, as well as members of the bacterial genera Ajipia, Nitrobacter and Blastobacter (Figure 2).