17 - Agrobacterium and Rhizobium

17 - Agrobacterium and Rhizobium - Topic 17 Agrobacterium...

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Unformatted text preview: Topic 17 Agrobacterium and Rhizobium Agrobacterium and the rhizobia Members of the Alphaproteobacteria Family: Rhizobiaceae Gram-negative, aerobic rods generally plant-associated Include Agrobacterium Crown-gall disease Causes tumours Rhizobium , Sinorhizobium , Azorhizobium , Mesorhizobium , Bradyrhizobium symbiotic nitrogen-fixers root nodules m u t u a l i s m p a r a s i t i s m A g r o b a c t e r i u m T h e o n l y t r a n s- d o m a i n g e n e t i c t r a n s f e r Agrobacterium tumefaciens Tumours induced by bacterial infection occur at wound sites infect a wide variety of plants (right: tobacco) igure 25.18 Ti Plasmid of A . tumefaciens Figure 25.19 Signalling Two component regulatory system sensor kinase (VirA) and response regulator (VirG) Figure 25.20 Conjugal Transfer of Ti Figure 25.20 Conjugal Transfer of Ti Figure 25.20 Ti Plasmid of A . tumefaciens Opines produced by plant amino-acid-like compounds Source of carbon, nitrogen and phosphate Oncogenes plant hormone production...
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17 - Agrobacterium and Rhizobium - Topic 17 Agrobacterium...

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