12-2- 16 How do plants resist stress and pathogens.docx

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- Sunday: 4 p.m. office hour (Brochstein) and 7 p.m. review session (Keck) - **Nitrate in soil goes up to the plant through the root through the xylem, not the phloem 12-2- 16 How do plants resist stress and pathogens? Pathogens - There are microbe pathogens and herbivores that can be possible pathogens for plants/threats - Earlier, we discussed mycorrhizal fungi (involved with soil nutrient delivery to the plant) and Rhizobia (involved in N2 fixation (legumes)), as well as NOD factor (a short polysaccharide) o NOD factor comes from the cell walls of microbes that have evolved to be signaling molecules—there are different versions of the NOD factor for different Rhizobia - M icrobial A ssociated M olecular P attern—there are plant receptors for these different molecules called MAMP receptors. MAMP receptors (in plant) - Outside of cell?- Plasma membrane (receptor part) - Cytosolic?- bacteria inside the cell - Association with microbes and plants increases the number of MAMP receptors?
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