BIOL108 Lecture Notes - Lecture 1: Non-Vascular Plant, Plant Evolution, Streptophyta

• School: University of Alberta
• Department: Biology (Biological Sciences)
• Course: BIOL108
• Professor: Richard Moses

Document Summary

And life cycles: major events in plant evolution: Presence of sporopollenin (a macromolecule): most decay and chemical resistant biopolymer on earth, encapsulates zygote. )ygote retai(cid:374)ed i(cid:374) (cid:373)ulti(cid:272)ellular haploid: e(cid:374)(cid:272)ased i(cid:374) (cid:373)ulti(cid:272)ellular stru(cid:272)ture (cid:894)does(cid:374)(cid:859)t have alternation of generation so not gametophyte), charophyceans have haplontic life cycles. Care of multicellular embryo: protection from desiccation (drying out), nutrients via (cid:858)pla(cid:272)e(cid:374)tal tra(cid:374)sfer (cid:272)ells(cid:859) Apical and subapical meristems: shoots and roots- selection favour root growth below ground to get access to water, leaf growth above ground to get light. Grasses have intercalary meristems evolved in response to grazing. Sporopollenin encapsulates spores (encapsulates pollen in seed plants: protects spores from decomposition and desiccation (drying out). In an alternation of generation life cycle spores are released in the air. Another derived characteristic: alternation of generation: ge(cid:374)eral (cid:272)hara(cid:272)teristi(cid:272)s pla(cid:374)ts (cid:894)they do(cid:374)(cid:859)t all ha(cid:448)e the(cid:373)(cid:895): Vascular tissue: non-(cid:448)as(cid:272)ular pla(cid:374)ts do(cid:374)(cid:859)t ha(cid:448)e (cid:373)u(cid:272)h support. Secondary plant compound: secondary metabolic products from primary metabolic reactions.