BBlecture15S09s - Proteo34 The Bacteria (Proteobacteria...

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The Bacteria (Proteobacteria cont.) The Bacteria (Proteobacteria cont.) 24.14: 24.14: Agrobacterium Agrobacterium and Crown Gall Disease and Crown Gall Disease 24.15: 24.15: The Legume-Root Nodule Symbiosis (the Rhizobia) The Legume-Root Nodule Symbiosis (the Rhizobia) 15.14: Spirilla 15.14: Spirilla 15.16: Budding and Prosthecate/Stalked Bacteria 15.16: Budding and Prosthecate/Stalked Bacteria 15.17: Gliding Myxobacteria 15.17: Gliding Myxobacteria Proteo34
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Agrobacterium; Agrobacterium; the rhizobia the rhizobia : : both members of family Rhizobiaceae, in alpha- proteobacteria gram negative, aerobic, motile rods found in soil Agrobacterium : invades crown, roots, stems of many plants; transform plant cells causing tumours rhizobia ( Rhizobium , , Bradyrhizobium, Sinorhizobium, Azorhizobium, Mesorhizobium ): stimulate root nodule formation, conduct N 2 -fixing symbiosis with legumes some believe agrobacteria & rhizobia are actually “members of same species” most distinguishing characteristics are plasmid-borne Proteo35
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Agrobacterium Agrobacterium : : Tumours Tumours induced by induced by Agrobacterium Agrobacterium tumefaciens tumefaciens Agrobacterium Agrobacterium : Proteo35a
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crown gall tumour on tobacco plant crown gall tumour on tobacco plant : (Fig 24.39, 12 th ed) Proteo35b
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events following infection of a susceptible plant by A. tumefaciens : (inducers) sensor kinase response regulator (Fig 24.41, 12 th ed) Proteo36
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Ti plasmid of Ti plasmid of A. tumefaciens A. tumefaciens : (Fig 24.40, 12 th ed) Proteo37
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BBlecture15S09s - Proteo34 The Bacteria (Proteobacteria...

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