B300_VascularTissueNotes

B300_VascularTissueNotes - 1 Evolution of Vascular Plants...

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Evolution of Vascular Plants (Tracheophytes) • Evolutionary history of Embryophytes • Evolution of Tracheophytes • Features of vascular tissue • Secondary growth & woody stems 1 • Many of these are noted in Figs 7.1, 7.2, 7.6, 7.8, and 7.12. You should know the order of evolution for these characters • Green plant chloroplast ! Evolution from cyanobacterial ancestry (Fig. 7.1) ! Unique features " Presence of chlorophyll b " Thylakoids/grana " True starch Apomorphies in Green Plant Evolution Leading to Embryophytes 2 Apomorphies in Green Plant Evolution Leading to Embryophytes Characters evolving in "Green algae": Cellular structure ! Plasmodesmata - connections between cells allow for easy transfer of molecules ! Phragmoplast – Remember this from L101? Branched, apical growth ! One or more meristematic cells at apex Life cycle changes ! Oogamy – dimorphic gametes; large egg, small sperm ! Retention of egg and zygote on haploid parent body " Nutritional dependence of zygote on parent 3 Apomorphies in Green Plant Evolution Leading to Embryophytes Synapomorphies for the Embryophytes: Resting embryo stage True alternation of generations with multicellular sporophyte Multicellular gametangia with protective cell layer around gametes ! Antheridium: produces sperm ! Archegonium: produces eggs (usually 1) Multicellular sporangium ! Thick-walled spores with trilete marks Moss antheridium Devonian spores with trilete marks (Belgium) Liverwort archegonium 4
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This note was uploaded on 12/13/2010 for the course BIO 102 taught by Professor Mclister during the Fall '10 term at Indiana University South Bend.

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B300_VascularTissueNotes - 1 Evolution of Vascular Plants...

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