plants (kingdom plantae) multicellular eukaryotes photoautotrophs terrestrial? –not all plants are...
TRANSCRIPT
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Plants (Kingdom Plantae)
• Multicellular eukaryotes
• Photoautotrophs
• Terrestrial?– Not all plants are terrestrial
• Return to water from land
• Move to land was a major step
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Move to Land Required Significant Adaptations
• Water uptake and loss
• Gas exchange
• Reproduction
• Support
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Move to Land
• Plants probably evolved from a group of green algae called the charophytes
• Are a fringe species exhibiting multicellular traits
• Why a fringe species?
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Features Common to Green Algae and Plants
• Chlorophyll a and other accessory pigments (Chl b, -carotene)
• thylakoid membranes stacked into grana
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Features Common to Green Algae and Plants
• Chlorophyll a and other accessory pigments (Chl b, -carotene)
• similar photosynthesizing organelles
• cell walls of cellulose
• store carbohydrates as starch
• alternation of generation
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Highlights of Plant Evolution
• Four major periods
• Move onto land (~425 - 475 mya)
– prevent desiccation of whole plant
– protect reproductive structures
– Features seen in mosses (bryophytes)
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Highlights of Plant Evolution
• Evolution of vascular tissue and diversification (~400 mya)– simple diffusion not an option–Mosses - water-conducting tubes– transport and support– larger body sizeThese are features first seen in ferns, horsetail,
whisk ferns****Similar protection of gametes
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Horsetail
Whisk Fern
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Highlights of Plant Evolution
• Evolution of seed (~360 mya)
– additional protection from desiccation and predation
– dispersal
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Highlights of Plant Evolution
• Emergence of flowering plants (~130 mya)– Seeds in protective ovary– Expanded potential for diversity–Complex structure with great potential
for adaptation–Greater sexual reproductive success–Coevolution between insects and
angiosperms
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Nontracheophytes
• Mosses, liverworts and hornworts
• Probably closest to ancestral form
• protected gametangia
• lack vascular tissue
• Encrusting
• Water needed for fertilization
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Gametophyte
Sporophyte
Sporophyte relies on gametophyte for nutrients
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Nonseed Tracheophytes Plants
• Ferns, horsetail, club mosses
• Retain some traits of mosses
• Evolved some traits also seen in seed-producing vascular plants
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Traits Shared with Nontracheophytes
• Antheridia and archegonia retain similar structure
• Require water/moisture for sexual reproduction
• Production of spores
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Traits Shared with Seed-Producing Plants
• Vascular tissue - greater body size
• Sporophyte is dominant stage of life cycle
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Gametophyte
Sporophyte
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Seedless tracheophytes were the dominant vascular plants for ~ 50 million years
• Continents in tropical/subtropical zone
• As continents drifted away from equator, conditions changed
• Seed-producing plants were present during height of seedless vascular plant success
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Rise of Seed-Producing Tracheophytes
• Well suited for environmental changes
• Gametophyte smaller and retained in moist tissues of sporophyte
• Pollination rather than swimming sperm
• Evolution of seed
• gymnosperms and angiosperms
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Gymnosperm
• “naked seed”
• still have a seed coat
• four divisions
• Coniferophyta best known
• evergreens
• needle-shaped leaves, thick cuticle
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Gametophyte
Sporophyte
Gametophyte passes within sporophyte
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• “protected seed”
• most diverse group– 235,000 known species vs. 721 species of
gymnosperms
• One division - Anthophyta
• Two classes– Monocotyledones– Dicotyledones
Angiosperms
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Angiosperms
• successful and effective design
• different themes of the same design
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Gametophyte
Sporophyte
Gametophyte passes within sporophyte
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Develops into fruit
Develop intoseeds
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