BISC 101 Lecture Notes - Lecture 11: Nitrifying Bacteria, Mycelium, Rhizosphere
30 Oct 2017
School
Department
Course
Professor
Document Summary
Bisc 101 - midterm 2 review: soils & plant nutrition growth/development. Needed by plants in small amounts (1: 1 trillion - cofactors in enzyme rx) Plants able to show deficiency before it is too late. Low p = stunted growth & dead spots. Ability hold h2o/ make available to plants. Roots hairs increase sa available for nutrient/h2o uptake. Root hair s have large numbers of membrane proteins including proton pumps. 1. charged soil particles bind + charged ions. 2. h+ ions (from roots) displace mineral cations, enter oil solution & become available to plants. 3. anions (nitrates, phosphates, sulfates) are not tightly bound soil particles. Extensive mats or networks fungal mycelia extend under soil. Provide nutrients for plants b/c of . Fungus secretes peptidases break down amino acids in dead o. molecules. Hyphae extend over root in extracellular spaces (apoplast) b/w root & cells. Facilitates exchange b/w fungus & plants ammonifying/n-fixing bacteria produce ammonia (nh3)
