the plants. supergroup plantae original photosynthetic symbionts includes the red algae and the...
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THE PLANTS
Supergroup Plantae
• Original photosynthetic symbionts
• Includes the red algae and the green plants
• All with somewhat simple walls
Eukaryotic Domains
Green Plants
• Chlorophylls a and b• Walls of cellulose• Store starch
Generalized plant life history
Earliest Systems for Plants
• Mostly defined functionally by foragers, farmers, and physicians
• Still used in terms like weed, fruit (non-technical usage), herb, and vegetable
Illustration of an early herbal, De Materia Medica (~50-70 C.E.) by Dioscoides
Theophrastos of Lesbos• Successor to Aristotle and
developed his philosophy in many areas.
• Developed system of plants in parallel with Aristotle’s system on animals
• Structure of plants– Herbs– Shrubs– Trees c. 371-287 B.C.E., Athens
Karl von LinnéCarolus Linnaeus (1707-1778)
• Linne is reference to a large lime tree near his ancestral home
• Latinized his name to Carolus Linnaeus
• Created a system on plants using the sex organs as a means of classification
• Species Plantarum (1753) is the starting point for all plant taxonomy Key to the sexual system from the 10th
edition (1758) of Systema Naturae
Modern Systems based on Morphology
• Unified botanical information for North America
Gray and Gleason• Asa Gray (1810-1888)• Univ of Michigan and Harvard• Met Darwin at Kew through
Hooker• Manual of Botany a standard for
100 years
• Henry Gleason (1882-1975)• Univ Michigan, Univ Illinois, and
New York Botanical Garden• Revised Gray’s Manual
Molecular Phylogenetics of Plants
• PhyloCode (introduced in 1983)
• American Phylogeny Group (also called Angiosperm Phylogeny Group, first released 1991).
• Walter Judd (1951- )• Univ of Florida• Plant Systematics, a
Phylogenetic Approach
Green Plants
MAJOR CLADES OF THE GREEN PLANTS. This system reflects all of these changes in the taxonomy of the Viridiplantae with two subkingdoms: Chlorobionta and Streptobionta. See the Tree of Life Project and Palmer et al. (2004) for the consensus view of the molecular/ ultrastructural relationships between the higher taxa of the green plants.CH = Chlorobiont CladeST = Streptobiont CladeEM = EmbryophytesVP = Vascular PlantsSP = Seed Plants
Green algal diversity
Bryophytes
Tracheophytes
• Plants have vascular tissue– Xylem– Phloem
• Usually with stems, roots, and leaves
Ferns
The Seed
Conifers and other Gymnosperms
Flowering Plants• Contain flowers• Fruit is derived from the ovulary of the flower
MAJOR CLADES OF THE FLOWERING PLANTS1. The Flowering Plants2. The Basal Families3. Plicate Flowering Plants4. Magnoliids + Monocots5. Magnoliids6. Monocots7. Dicots8. Basal Dicots9. Eudicots
Flower
Placement of ovulary
Major Types of Flowering Plants
• Primitive Dicots• Magnolias and their relatives• Monocots• Derived Dicots
Primitive Dicots
Water Lilies Amborella, sister to all other living flowering plants
Magnolias and their Relatives
Magnolia flower Avacado
Monocots
Wheat
Orchid
TABLE 1. Important grass grain plants of the world, their generic names, and the regions of the Earth where the plants were domesticated. Much of this information came from Glemin and Bataillon (2009).
GRAIN GENERIC NAME REGION OF DOMESTICATION
Rice (Figure 25) Oryza Asia
Wheat (Figure 26) Triticum Middle East
Maize (corn; Figure 27) Zea Central America
Barley Hordeum Middle East
Pearl Millet Pennisetum South Africa
Foxtail Millet Setaria East Asia
Proso Millet Panicum Asia
Finger Millet Eleusine Ethiopia
Rye Secale Turkey
Oats Avena Middle East
Sorghum (milo) Sorghum Northern Africa
Derived Dicots
Flowers –large and small
Wolffia in flower, floating plant
Rafflesia, largest flower, related to euphorbias and parasitic on vines of SE Asia
Amorphophallus titanum, largest unbranched inflorescence, an aroid.
Arrangements of flowers
Largest Inflorescence
Types of fruits
Major Events in Plant Evolution
• Appearance of land plants initially limited to mosses and relatives during Ordovician Period (~470-440 mya) based on fossil spores.
• Plants restricted to lowlands and wet areas of temperate to tropical latitudes.
Mosses growing in a Scotland bog, their success related to symbioses with fungi. Likely, this was true at the time of the earliest emergence. (David Beerling, University of Sheffield)
Life on Land
Advantages• Unfiltered light• Atmosphere larger
reservoir of CO2 • Initially, fewer predators?
Disadvantages• Exposure to UV light• Need for water storage and
uptake• Need for photosynthate
used for support
Major Events in Plant Evolution• Vascular tissue• Shift to dominance of
spore-producing portion of life cycle
Restoration of Cooksonia from Silurian
Vascular tissue in stem of Rhynia, lower Devonian
Telome Theory
Walter Max Zimmermann; 1892-1980, Germany
Major Events in Plant Evolution
Late Devonian Pennsylvanian
Major Events in Plant EvolutionThe Seed
Major Events in Plant Evolution
Major Events in Plant Evolution
Major Events in Plant Evolution
These are from the lower Cretaceous, but flowering plant pollen has been found in strata 100 my earlier.
Major Events in Plant Evolution
Wasp attempting to copulate with an orchid
The Bee Orchid