BIOL-1507EL Lecture Notes - Lecture 2: Devonian, Gametangium, Sporopollenin
21 Mar 2015
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Document Summary
Charophycean- most land plants originate from this type of algae. 4 similarities: peroxisome enzymes, flagellated sperm, rosette cellulose- synthesizing complexes, formation of phragmoplasts (divides cells at end of mitosis) certain details of cell division occur only in land plants and certain charophycean including the genera chara and coleochaete. For example: the synthesis of a new cell plate during cell division involves the formation of phragmoplasts, an alignment of cytoskeletal elements and golgi derived vesicles across the midline of the dividing cell. The history of terrestrial adaptation is the key to modern plants** The first period of evolution was associated with the origin of the plants from their aquatic ancestors, a group of algae known as charophycean during the. Ordovician period of the paleozoic era (475 million years ago) The first terrestrial adaptation included spores toughened by sporopollenin and jacketed gametangia that protected the gametes and embryo. Vascular tissue also evolved early in the plant history.
