campbl29 - Modern Protist Diversity Plant Clades Plant...

Info iconThis preview shows pages 1–22. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Modern Protist Diversity Plant Clades Plant Clades P h y l u m / D i v i s i o n B r y o p h y t a P h y l u m / D i v i s i o n P t e r o p h y t a P h y l u m / D i v i s i o n C o n i f e r o p h y t a P h y l u m / D i v i s i o n A n t h o p h y t a From Algae to Plants The ancestor of all plants was a green alga Green algae have plant-like chloroplasts, plant- like cell walls, and a plant-like energy storage molecule (starch) etc. The ancestor of plants probably was a green alga that lived whole or partially in very shallow water, perhaps susceptible to periodic drying up Those algae that could continue to metabolize despite not being completely covered with water presumably possessed a selective advantage including shading those algae restricted to water The first roots were stems (stipes) that physically connected out-of-water portions of algae with still- in-water portions Water diffused over short stems to keep above- water, actively photosynthesizing tissues from desiccating Chara Gametangia Oogonium Antheridium The Challenges of Land Algae: Get minerals and water from surrounding water Have their bodies supported by surrounding water Their sperm and spores swim through the water Plants: Get their Minerals and Water from soil Soil is subject to desiccation Soil also is opaque to sunlight Do not have their weight supported by surrounding water Do not have, or have less water for sperm and spores to swim through To survive on land, plant ancestors had to address these challenges Evolution of First Plant Plant Innovations 1. Waxy cuticles (water proofing) 2. Stomata (holes in above) 3. Dominant sporophyte 4. Vascular tissue 5. Woody tissue 6. Pollen (non-motile sperm carrier; also male gametophyte) 7. Seeds (embryo carrier) 8. Flowers 9. Fruit Timing of Innovations Plant Innovations 1. Waxy cuticles 1. Stomata 2. Dominant sporophyte 3. Vascular tissue 4. Woody tissue 5. Pollen 6. Seeds 7. Flowers 8. Fruit Waxy Cuticle Flaccid / Wilted Plant Innovations 1. Waxy cuticles 1. Stomata 1. Dominant sporophyte 2. Vascular tissue 3. Woody tissue 4. Pollen 5. Seeds 6. Flowers 7. Fruit Gas Exchange Stomata Guard Cells Air in, Water out no Air in, no Water out Plant Innovations 1. Waxy cuticles 2. Stomata 1. Dominant sporophyte 1. Vascular tissue 2. Woody tissue 3. Pollen 4. Seeds 5. Flowers 6. Fruit Dominant Sporophyte vasculature Plant Innovations 1. Waxy cuticles 2. Stomata 3. Dominant sporophyte 1. Vascular tissue 1. Woody tissue 2. Pollen 3. Seeds 4. Flowers 5. Fruit Vasculature (etc.) 90% of water passed up through Xylem is transpired out of plant through stomata Photosynthate moves down from leaves, Minerals and Water move up from roots Plant Innovations...
View Full Document

Page1 / 105

campbl29 - Modern Protist Diversity Plant Clades Plant...

This preview shows document pages 1 - 22. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online