Bis2CF10.Lecture14

Bis2CF10.Lecture14 - Lecture 14 PLANTS & RELATED...

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Unformatted text preview: Lecture 14 PLANTS & RELATED EUKARYOTES Place of plants in the Tree of Life Basic features and innovations in closest outgroups: “green algae” Haploid life cycle of algal outgroups Next: origin of land plants (embryophytes) Mt. Donna Buang, Australia Barro Colorado Island, Panama Daintree River, Australia NASA Blue Marble CO2 + H2O --> (CH2O) + O2 photoautotrophs synapomorphies FLOWERING PLANTS = ANGIOSPERMS More emphasis on morphology (= form, structure) More emphasis on fossils moss clubmoss fern seed plant d c b a More emphasis on fossils moss clubmoss fern seed plant d c b a Even if fossils don’t affect inferred molecular relationships among living groups, they can show intermediate morphologies and the order of origin of synapomorphies. Chromalveolates PLANTAE Excavates Rhizaria Unikonts Red algae Glaucophyta Green plants Asteromonas unicellular flagellate Cyanophora loss of flagella loss of peptidoglycan PLANTAE cellulose cell wall endosymbiosis with cyanobacterium (chlorophyll a, phycobilins, peptidoglycan in cp wall) two flagella Red algae Glaucophyta Viridiplantae = green plants Cyanophora chlorophyll b loss Porphyraof phycobilins (nori) loss of flagella loss of peptidoglycan PLANTAE cellulose cell wall endosymbiosis with cyanobacterium (chlorophyll a, phycobilins, peptidoglycan in cp wall) two flagella Red algae Glaucophyta Green plants Asteromonas unicellular flagellate Cyanophora loss of flagella chlorophyll b loss of phycobilins starch stored in chloroplast loss of peptidoglycan PLANTAE cellulose cell wall endosymbiosis with cyanobacterium two flagella Green plants Green plants: two main clades Red algae Chlorophytes Streptophytes Chlorophytes Caulerpa Green plants Streptophytes Chara Mesostigma Chlamydomonas Asteromonas Spirogyra Chlorophytes Caulerpa Green plants Volvox coenocytic colonial flagellate Chlamydomonas Ulothrix filaments Ulva 2-D sheet Asteromonas Chlorophytes Caulerpa Green plants coenocytic Valonia Chlamydomonas Ulothrix filaments Ulva: 2-D sheet Chlorophytes Caulerpa Green plants Streptophytes Chara Mesostigma MLS Spirogyra multilayered structure Chlorophytes Streptophytes Spirogyra Chlorokybus Charales Mesostigma Coleochaete Klebsormidium oogamy apical growth branched filaments phragmoplast filaments multilayered structure Vegetative advances (= non-reproductive) Land plants Chlorophytes Streptophytes Ulothrix Spirogyra Charales Coleochaete oogamy apical growth branched filaments phragmoplast ⇒ cell plate with plasmodesmata Most chlorophytes “Higher” streptophytes Vegetative advances (= non-reproductive) Land plants Chlorophytes Streptophytes Ulothrix Spirogyra Charales Coleochaete Plant cells oogamy apical growth branched filaments phragmoplast ⇒ cell plate with plasmodesmata Vegetative advances (= non-reproductive) Land plants Streptophytes Spirogyra Charales Charales cells divide at margin Coleochaete Coleochaete filaments oogamy branched filaments apical growth phragmoplast ⇒ cell plate with plasmodesmata Vegetative advances (= non-reproductive) Land plants apical cell derivative cell Chlorophytes Streptophytes Spirogyra Chlorokybus Charales Mesostigma Coleochaete Klebsormidium filaments multilayered structure oogamy branched filaments apical growth phragmoplast ⇒ cell plate with plasmodesmata Vegetative advances (= non-reproductive) Land plants Basic events in eukaryotic sexual life cycle Basic events in eukaryotic sexual life cycle Diploid life cycle Diploid multicellular animal Spore = reproductive cell that is not a gamete Multicellular 1n organism Haploid life cycle Land plants Alternation of generations Haploid life cycle Ulothrix (a chlorophyte) ...
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This note was uploaded on 04/19/2011 for the course BIOLOGY BIS 2C taught by Professor Doyle during the Fall '10 term at UC Davis.

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