01:119:116 Lecture Notes - Lecture 7: Non-Vascular Plant, Lycopodiopsida, Charophyta
22 Apr 2016
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Document Summary
Characteristics of charophytes that enables moved to land. Edges of ponds and lakes subject to occasional drying. Natural selection favours survival for periods without being submerged. Similar adaptation found in plant spores wall. Land plants shared traits with only charophytes. Rings synthesise cellulose microfibrils of cell walls. Group of microtubules forms between daughter nuclei during cell division. Cell plate forms in middle of phragmoplast gives rise to new cross walls. Derived traits of plants that separate daughter cells. 5 key traits appear in nearly all land plants but are absent in the charophytes. The diploid embryo is retained within the tissue of the female gametophyte. Nutrients are transferred from parent to embryo through placental transfer cells. Land plants are called embryophytes because of the dependency of the embryo on the parent. Sporangia = multicellular organs in sporophytes produce spores. Sporocytes = diploid cells in sporangia undergo meiosis to produce haploid spores.
