01:119:116 Lecture Notes - Lecture 7: Charophyta, Sporopollenin, Gametangium
22 Apr 2016
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Document Summary
Plant diversity i: evolved from ancestral charophytes (modern charophytes sister taxon to land plants, adaptation for land. Many charophytes live at the edge of ponds sometimes die out selection favors survival on dry land sporopollenin - layer of polymer surrounding zygote; prevents desiccation: shared derived traits between land plants and charophytes. C. 4. rings of cellulose - synthesizing proteins structure of flagellated sperm phragmoplast - groups of microtubules between daughter nuclei cell plate: derived traits of land plants. Diploid sporophyte - produces spores by meiosis. 2n embryo retained in female gametophyte tissue. Nutrient transferred parent embryo through transfer cells. Sporocytes - 2n cells, undergo meiosis haploid spores. Spores - haploid reproductive cells; grow into multicellular gametophyte by mitosis. Spore wall contain sporopollenin - resistant to harsh conditions. Archegonia - female; produce eggs; site of. Don"t move; elongate increase access to resources (light, nutrients, etc) Apical meristems - regions of cell division at tips of roots and shoots.
