{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

mcdb20lec10su09

mcdb20lec10su09 - Lecture 10 Diversification of the...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
FIGURE 12-30 The three-stage reproductive cycle of a fungus FIGURE 12-30 The three-stage reproductive cycle of a fungus FIGURE 12-30 The three-stage reproductive cycle of a fungus FIGURE 12-30 The three-stage reproductive cycle of a fungus Examples of Fungi 14 Most are non-motile Have a thin, rigid cell wall composed of chitin Fungi are heterotrophic – Most are saprophytes that secrete enzymes that digest materials they live on. – Important Decomposers – Wood rot fungi can degrade lignin Kingdom Fungi • Include many parasites and pathogens – Ringworm – Athlete’s Foot – Candida yeast infections 15 16 Fungal pathogens 17 18
Background image of page 2
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
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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.
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}