01:119:116 Lecture Notes - Lecture 7: Cell Plate, Fern, Microtubule

• School: Rutgers University
• Department: Biological Science
• Course: 01:119:116
• Professor: Heather Lewis

Document Summary

L7 plant diversity i: introduction to land plants, evolved from charophytes (green algae, characteristics of charophytes that enabled this move to the land. Inhabit shallow water around the edges of ponds & lakes can withstand drying: sporopollenin- durable polymer layer prevents exposed zygotes from drying out. Do form a grade- collection of organisms that share key biological features, do not necessarily share ancestry: vascular plants i. Form a grade, not a clade: seed plants. Seed- embryo w/ supply of nutrients inside protective coat. Angiosperms (dominant group)- flowering plants, seeds enclosed in fruit. Protenema (filament of cells)- form buds through mitosis gametophores (gamete producing structures) In some forests, harbor n-fixing cyanobacteria inc. n availability: peat- partially decayed organic material. Peatlands- 3% of earth"s surface, ~30% of soil c c reservoir (stabilize atmospheric co2 conc. ) Vascular plants: earliest fossils (~425 mya, dominant- today, main traits, sporophyte (2n) generation is dominant, transport in vascular tissue, xylem- h2o & molecules.