01:119:115 Lecture 31: chapter31
15 Feb 2018
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Document Summary
Overview: mighty mushrooms: the honey mushroom armillaria ostoyae in malheur national park in eastern oregon is enormous. Fungal spores have been found 160 km above the ground. Concept 31. 1 fungi are heterotrophs that feed by absorption. Absorptive nutrition enables fungi to live as decomposers and symbionts. Some parasitic fungi, including some that infect humans and plants, are pathogenic. Fungi cause 80% of plant diseases: mutualistic fungi also absorb nutrients from a host organism, but they reciprocate with functions that benefit their partner in some way. Extensive surface area and rapid growth adapt fungi for absorptive nutrition: yeasts are single-celled fungi. Concept 31. 2 fungi produce spores through sexual or asexual life cycles. Many fungi have a heterokaryotic stage: the nuclei of fungal hyphae and spores of most species are haploid, except for transient diploid stages that form during sexual life cycles. In many fungi, the haploid nuclei do not fuse right away.
