EEB340 Lecture 15.docx

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Department
Ecology & Evolutionary Biology
Course
EEB340H1
Professor
Rowan Sage
Semester
Winter

Description
Lecture 15 Alternation of GenerationsAlternation of Generations in Seedless Vascular PlantsDistribution of SporangiaGametophyte Development going from nonvascular to seedless vascular plants o shift in dominant phase gametophytesporophyte for seedless vascular plantsLycopodiumone species has microphylls with no association with sporangia and aggregation of sporophylls called strobilus compact conelike structuremore protection for sporangia o Other species has basal distribution of sporgania has microphylls with sporangia nested in their axissporophylls leaf that produces sporgania or fertile leaf o Maybe microphylls evolved as infertile sporophylls o Freesporingspores dispersed into the environmentCapable of this because of modifications of cell wall that allow disperal o Secretory tapetumcells initially stay intactProducts secreted to area of spores to support the development of sporesApoptosis and degeneration later o Spores have really high fat
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