PLSC204 Lecture Notes - Lecture 26: Germination, Cubic Foot, Leghemoglobin
4 Feb 2019
School
Department
Course
Professor
Document Summary
Refers to plant and fungus together, mutual benefits. Host plant experiences enhanced nutrient (esp p) uptake and other benefits. Mycorrhizal fungi benefits from access to plant photosynthate. Certain fungi form associations with plant roots that serve to enhance nutrient availability (esp. P) to the plant by effectively increasing the root surface area (increasing the volume of soil being mined for nutrients); other possible benefits have been suggested, esp. enhanced water uptake. Dark ring around root, fungal tissue forms a mantle on root. Forms harting net when fungus grows in between cells around edge. Angiosperms: poplar, willow, oak, birch, beech, eucalyptus. Root does not change in morphology, looks. Fungus grows into cortex of root, not vascular tissue. Also forms vesicles - balloon like structure. Grows out into soil as well, can transport nutrients back into root. Biological n fixation - only certain bacteria can do this. N 2 (plant unavailable) -> nh 4 + (plant available)
