MIMG 101 Lecture Notes - Lecture 21: Leghemoglobin, Root Nodule, Flavonoid

• School: UCLA
• Department: Microbiology, Immunology, and Molecular Genetics
• Course: MIMG 101
• Professor: G U N S A L U S& B R A D L E Y

Document Summary

N2 reduction catalyzed by bacterial or archaeal nitrogenase (fes + fesmoco) only. Uses lots of energy to reduce n2 -> nh3. Only synthesized in the nodules (to supply bacteriods) Uses cell-cell signaling, signal reception, signal processing. Must have temporal and spatial control: plant attracts correct microbe partner by secreting chemical attractants (plant. Root nodules morphologically distinct from rhizobia type. Similar infection process as n2 rhizobia fixers. Fungi occupies area in between cells: fungal sheath/mantle surrounds plant root hairs. Fungi metabolizes sugars, excrete organic acids to solubilize minerals for plant uptake. Required for: orchids, azaleas, citrus trees + fungi. Optional for: wheat, corn, beans commercial grains: would produce more crops if partnered. Fungi solubilizes minerals, provides nutrients to plant. Plant supplies carbon and energy for microbe. Cortex, algal layer, medulla [cam: fungi = cortex, medulla, algal layer feeds fungal layers, fungal layers provide nutrients, minerals, medulla anchors the algal layer. Photsynthetic partner: provides photosynthate and n.