MBIO 3280 Lecture 21: Habitats - Terrestrial

• School: University of Manitoba
• Department: Microbiology
• Course: MBIO 3280
• Professor: Vladimir Yurkov

Document Summary

Increased recycling and solubilisation of mineral nutrients: synthesis of vitamins, amino acids, and auxins, cytokinins and gibberellins, which stimulate plat growth, antagonism of potential plant pathogens (prevent development of plant growth) Microbial activities in soil: every process covered in biogeochemical cycling section of this course. Physical environment: very stable, usually anoxic, rock is often layered (shales/sandstones, substrates often limiting, pristine environment selects for oligotrophs, most microbes are associated with surfaces, microbial transport is mostly just with water flow. Inorganic nutrients delivered by slow underground flow of water through rock pore spaces: e- acceptors are consumed according to thermodynamic principles: o2, no3, Very different from aquifers (this is an oil reservoir in water) Amount and quality of petroleum in subsurface depends on how much it has been biodegraded. Extreme environments, yet microbes exist in all places. Microbes grow on and inside the rocks. Mi(cid:272)ro(cid:271)es for(cid:373) (cid:862)(cid:271)iologi(cid:272)al soil (cid:272)rusts(cid:863) that sta(cid:271)ilize soils: live in communities.