BIOL240 Lecture Notes - Rhizobiaceae, Root Nodule, Alphaproteobacteria
13 Sep 2014
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Learning objectives: to appreciate the interkingdom interactions that occur between specific alphaproteobacteria and plants. The members of the rhizobiaceae are defined by their interaction with plant hosts. Agrobacterium general concepts: trans- kingdom genetic transfer (bacteria to plant), gene regulation in response to environmental signals. Expression of bacterial virulence genes induced by signals from wounded plant. Not only does agrobacterium colonize a specific habitat, but it actually creates (or enhances) that habitat. This sophisticated relationship invoves three players: oncogenic plasmid, agrobacterium cell, plant, agrobacterium is used for genetic engineering of plants. Infection process: wounding required. Attachment of agrobacterium to plant cells. Fundamentals of microbiology (biology 140) Root nodule bacteria: legume root nodules. There are over 15,000 species in the leguminosae family, ranging from forage legumes to grain legumes to trees. Many of these plants have organs on their roots called nodules. These nodules are packed full of bacteria called rhizobia .
