01:119:116 Lecture Notes - Lecture 7: Non-Vascular Plant, Lycopodiopsida, Meristem
15 Mar 2016
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Document Summary
Characteristics of charophytes enabled move to land: many species live in shallow water around edges of ponds and lakes. Land plants share traits with only charophytes: rings of cellulose synthesizing proteins. Synthesize cellulose microfibrals of cell wall: structure of flagellated sperm, phragmoplast. Group of microtubules between daughter nuclei during cell division. Cell plate forms in middle of phragmoplast. Give rise to cell walls of new daughter cells. Key traits which are found in plants but not in charophytes. Diploid embryo is retained within tissue of female gametophyte. Sporopollenin: resistant to harsh environmental conditions, multicellular gametangia. Produce and release sperm: apical meristem. Does not allow for gas exchange: stomata. Vascular plants vs. nonvascular plants: bryophytes. Do not form monophyletic group: seedless vascular plants. Do not form monophyletic group: grade collection of organisms that share key biological features. Bryophytes, seedless vascular plants: seed vascular plants. Nonvascular: small, diffusion and osmosis, moist environment, reproduction. Dominant generation can live independently of sporophyte.
