BIOL 209 Lecture Notes - Lecture 10: Mucoromycotina, Sporangium, Saprotrophic Nutrition
Document Summary
Glomoromycotina are obligate biotrophs (require nutrients from a host) They are mutually beneficial partnerships between a plant root and a fungus. Arbuscular mycorrhizas fungi are mutualistic (mutually beneficial) symbionts (organisms in close physiological relationship) Mucoromycotina are saprotrophs, rapidly growing on nutrient rich substrates: such as feces, bread, fruit. Asexual reproduction with sporangiospores in sporangia: hyphal, haploid, aseptate + multinuclear. Area around feces where an herbivore wont eat. Sporangium lands on fresh grass outside of the zone and can be eaten by herbivore (with grass) Spores are then po0ped out, and grow as new pilobolus hyphae (and the cycle repeats itself) Mating types + and are in one locus in 2 alternative genes: mycelia (1n) of opposite mating types grow to one another and the pheromones guide their growth. It"s not dikaryoti(cid:272) (cid:271)e(cid:272)ause the nu(cid:272)lei (cid:449)ill fuse. They (cid:449)ont di(cid:448)ide in syn(cid:272)hrony: you"d say it"s still haploid. Zygosporangium forms there after, developing a thick wall and becoming dormant.
