EVOLUTION OF LAND PLANTS

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Presentation transcript:

EVOLUTION OF LAND PLANTS

From Last Day:

Closest Living Relatives of Land Plants - Charophytes

Some Charophytes Chara Coelochaete

Typical Charophyte habitat ? Adaptations? - sporopollenin (polymer)

Pollen grains – land plants

Closest Living Relatives of Land Plants - Charophytes Why?? – 4 features 1) Rosette-shaped cellulose-synthesizing complex 2) Peroxisome enzymes 3) Structure of sperm phragmoplast 4) Formation of a phragmoplast These are all shared ancestral traits

What makes land plants unique 1. Alternation of generations Two different kinds of organisms 1) Gameophyte 2) Sporophyte

What makes land plants unique 2) Walled spores produced in sporangia Sporopollenin in walls -

What makes land plants unique 3) Multicellular gametangia

What makes land plants unique 4) Apical meristems

Who are the land plants and how are they related

Non-vascular Plants – The Bryophytes Liverworts Hornworts Non-vascular Plants – The Bryophytes Mosses Club mosses Ferns Gymnosperms Note: The bryophytes and the Bryophyta are not the same Angiosperms Bryophyte – a collective term for the liverworts, hornworts and mosses (3 separate phyla) Bryophyta – the formal Latin name for the phylum of the mosses

Non-vascular Plants – The Bryophytes Liverworts Hornworts Non-vascular Plants – The Bryophytes Mosses Club mosses Ferns Who are they? Gymnosperms Angiosperms 1) Liverworts Thalloid Leafy

Non-vascular Plants – The Bryophytes Liverworts Hornworts Non-vascular Plants – The Bryophytes Mosses Club mosses Ferns Who are they? Gymnosperms Angiosperms 2) Hornworts

Non-vascular Plants – The Bryophytes Liverworts Hornworts Non-vascular Plants – The Bryophytes Mosses Club mosses Ferns Who are they? Gymnosperms Angiosperms 3) Mosses

Non-vascular Plants – The Bryophytes Liverworts Hornworts Non-vascular Plants – The Bryophytes Mosses Club mosses Ferns Key feature of all the bryophytes Gymnosperms Angiosperms Gametophyte is dominant part of the life cycle Sporophyte Gametophyte

Life cycle of a Moss