Biob 110cs 1st Edition Lecture 10 Current lecture Biofilms Many prokaryotes will surround themselves in biofilm polysaccharide coating slime Biofilms and biofouling cause complications in o Industry oil and gas wells ships pipelines o Medicine artificial joints antibiotic resistant infections tooth decay Plants interact with prokaryotes in 3 ways 1 Symbiosis nitrogen fixation legumes do this 2 Pathogenesis diseases a parasitic relationship 3 Gene transfer between bacteria and plants they share genes Chemical communications between plants and bacteria a Legume roots release flavonoids that Rhizobacteria recognize and then release NOD factors b Plant root hairs conform around bacteria and start nodule construction c Bacteria grow between cells and infect plant cells d Roots make leghemoglobin to bind oxygen in the nodule e Rhizobacteria reduce N2 to NH3 ammonia Some bacteria cause plan diseases These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute a Leaf spot scab and soft rot can all be fixed by cutting off the branches and burning the disease b Fire blight is hard to get rid of c Galls are caused by gene transfer between plants and bacteria and are an uncontrolled growth 1 Bacteria are attracted to compounds wounded roots emit 2 Bacteria transfer genes from the Tumor Inducing plasmid into the plants root 3 The genes encode enzymes that make plants create auxin causes plant cells to elongate cytokinin causes plant cells to divide and amino acids that are consumed by the bacteria When bacteria transfer genes with a plant hormone genes are replaced by a construct and a selectable marker gene that allows only transformed cell to grow Nitrogen fixation is symbiotic relationship Both rhizobia and plant receive food and shelter Agrobacterium is a parasite that causes a disease The bacteria receives food and shelter The plants receives nothing gets galls and has the nutrients sucked out of it
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