mcdb20lec10su09

mcdb20lec10su09 - Lecture 10 Diversification of the...

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Diversification of the Eukaryotes: Plants and Fungi Lecture 10 1 A Current Phylogenetic Tree 2 Adapting to terrestrial living • Protists moving onto land requires three adaptations: – Mineral absorption form dry rocky surfaces – Water conservation – Reproduction on land • Two distinct lines: –Fungi –Plants 3 Kingdom Fungi 4 Kingdom of Fungi Kingdom Fungi • Most are multicellular. • Made up of filaments called mycelia –mycelia are often multinucleate 5 Examples of Fungi 6 Filaments can organize into fruiting bodies called mushrooms 7 Kingdom Fungi • Fungal life cycle has three distinct phases 8 FIGURE 12-30 The three-stage reproductive cycle of a fungus
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Kingdom Fungi 19 Also many important plant pathogens Kingdom Fungi • Some are mutualistic – Mycorrhizae: fungal symbiosis with plant roots • 85% of extant land plants have mycorrhizae – Lichens: symbiotic with photosynthetic algae or bacteria 20 Kingdom Fungi • Some fungi are unicellular – Yeasts – Replicate asexually by budding – Replicast sexually by fusion – 2 haploid mating types • Often have many “mating types” – not just 2 sexes 21 22 Kingdom Fungi 23 Fungi can also be dimorphic –e.g., Valley Fever Kingdom Fungi • Fungi are closely related to animals – So. .... specific antifungal antibiotics – targets are rare – are difficult to discover – very expensive 24 A Current Phylogenetic Tree 25 26 Plant Kingdom A Current Phylogenetic Tree 27
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Kingdom of Plants Live in a variety of terrestrial habitats – and a few shallow aquatic habits • Eukaryotic • Autotrophic • Multicellular • Contain Chloroplasts – use chlorophyll a and b pigments • Cellulose cell walls 28 29 Kingdom of Plants • Exhibit alternation of generations 30 – Sporophyte generation • Diploid undergoes meiosis to generate haploid spores • Spores germinate and divide by mitosis to give rise to the gametophyte generation. – Gametophyte generation • Multicellular haploid generation • Undergoes mitosis to produce haploid gametes that unite (fertilization) to form a diploid zygote.
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This note was uploaded on 09/14/2009 for the course MCDB 20 taught by Professor Cooper during the Summer '08 term at UCSB.

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mcdb20lec10su09 - Lecture 10 Diversification of the...

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