GGR205H1 Study Guide - Final Guide: Phytoremediation, Riparian Buffer, Boron
Document Summary
Mycorrhizal fungi form symbiotic association with roots of most plants - use 10% of carbohydrates plant passes from leaves to roots - the fungi can"t manufacture carbohydrates grow out and search for nutrients/moisture. Plant well colonized with the fungi will have the equivalent of 10x more roots than without fungi. The fungi can prevent all root pathogens and damaging nematodes from attacking the plant root. Mycorrhizal association stimulated when there is ample light, adequate ph of the soil, good aeration, humus, and moderate soil fertility - inhibited by the presence of many chemical fertilizers. Important role in plants grown in infertile soils where p, zn, and cu especially scarce - assist tree growth. Mycorrhizal associations contribute to mineralization increase fertility: describe two major types of mycorrhizae. Mycorrhizas commonly divided into ectomycorrhizas and endomycorrhizas. Ectomycorrhizal - hyphae penetrate root and develop in free space around cells of cortex but do not penetrate cortex of root cell walls.
