BLG 144 Lecture Notes - Lecture 7: Green Algae, Paleobotany, Charophyceae

40 views4 pages
5 May 2015
Department
Course
Professor

For unlimited access to Class Notes, a Class+ subscription is required.

Chapter 30 – Green Plants
FIRST LINEAGE = rise to red and green algae
SECOND LINEAGE = rise to land plants
Red algae = accessory pigment MASKS CHLOROPHYLL
CHLOROPHYLL absorbs green and blue light
Green algae = GREEN PIGMENT of chloroplasts
Group = Chlorophytes and Charophyceae
They are biflagellated and unicellular
HOW DID SINGLE CELLED ALGAE BECOME MULTICELLULAR PLANTS?
A) Formation of colonies by individual organisms
B) Repeated Nuclear Division but no cytoplasmic division, THALLUS > SUPER CELL
cell with multiple nucleus
C) Multicellularity by cell division
EVIDENCE OF LAND PLANT EVOLUTION
A. MORPHOLOGICAL SUPPORT
Charophyceae (green algae lineage) is sister taxon to land plants because they share key
traits like
a) chloroplast pigments: chlorophyll a and b, beta carotene
b) Chloroplast structure: similar thylakoid arrangement (sites of reactions)
c) Organic molecule synthesis: both synthesize STARCH
d) Cell Walls, SPERM and PEROXISOMES similar in structure and composition
THREE MORPHOLOGICAL DIFFERENCES AMONG LAND PLANTS:
1) Non vascular plants: lack specialized cells to conduct water and nutrients, provide
SUPPORT
2) Seedless vascular plants: embryo NOT PROTECTED by seed
3) Seed Plants: embryo PROTECTED by seed
B. FOSSIL RECORD
Earliest land plant fossils (475 MYA) contained waxy cuticle layer, spores, and sporangia
Cuticle layer: prevents drying out.
Spore producing structures = sporangia
SILULIRIAN – DEVONIAN EXPLOSION = 2nd major land plant fossil record
CARBONIFEROUS PERIOD: 3rd major land plant fossil record interval, many large seedless
vascular plants ,large coal deposits
Gymnosperms: 4th major interval, first seed plants, seed bearing woody plants, NAKED
SEEDS
Unlock document

This preview shows page 1 of the document.
Unlock all 4 pages and 3 million more documents.

Already have an account? Log in

Get access

Grade+
$10 USD/m
Billed $120 USD annually
Homework Help
Class Notes
Textbook Notes
40 Verified Answers
Study Guides
1 Booster Class
Class+
$8 USD/m
Billed $96 USD annually
Homework Help
Class Notes
Textbook Notes
30 Verified Answers
Study Guides
1 Booster Class