01:119:116 Lecture Notes - Lecture 8: Protonema, Cyanobacteria, Phloem
28 Feb 2017
School
Department
Course
Professor
Document Summary
Lecture 8 - plant diversity 1: characteristics of land plants, evolution of land plants. Characteristics of charophytes that enabled move to land. Sporopollenin - complex polymer that protects from desiccation (drying out) Rings of cellulose-synthesizing proteins - make microfibrils of cell walls. Phragmoplast - scaffold for cell plate assembly: derived traits of land plants. Every other generation n (cid:314) 2n (cid:314) n (cid:314) 2n. Spores (n) by meiosis: multicellular dependent embryos, walled spores produced in sporangia. Sporocytes (2n) meiosis to produce spores (n: multicellular gametangia produce gametes. Antheridia (cid:314) sperm (man: apical meristems. Growth occurs at specific locations: cuticle. Waxy covering - prevents desiccation: stomata (sing. 470 mya fossils of spores from land plants. Tied to water (like amphibians of the plant kingdom: vascular plants. Vascular plants (tubes for transport of fluid) Know the clades on the right hand side. Three phyla of small non-vascular herbaceous plants: bryophyte life cycle. Becomes either antheridia (male) or archegonia (female)
