Botany - Taxonomy - Flourish and Bits Marchantiophyta liverworts 6,000 ‐8,000 Anthocerotophyta...
Transcript of Botany - Taxonomy - Flourish and Bits Marchantiophyta liverworts 6,000 ‐8,000 Anthocerotophyta...
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BOTANY
Carol Brouwer, Ph.D.Horticulturist
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http://www.flourishandbits.com
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Botanical Studies
Taxonomy: classification and naming of plants
Morphology: study of plant structures
Physiology: study of plant functions
Genetics: study of heredity
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TAXONOMYClassification of Plants
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Classification Systems
2 million living things Organize into groups Improves
communication Different groups for
different reasons Habitat Physical similarities
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Hierarchical Classification
Taxonomy employs a hierarchical system of classification
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Binomial System of Nomenclature
All species are named according to this system, which includes the authority for the name. Genus – noun Species – adjective Spearmint: Mentha spicata L.
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History: Aristotle (384 BCE –322 BCE)
1st to classify organisms
All plant essays lost
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History: Theophratus (370‐285 BCE)
Classified 500 species of plants on the basis of leaf characteristics.
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History: Pedanius Dioscorides (40‐90 CE)
Materia Medica Five‐volumes in Greek One of the most
influential herbal books in history
Remained in use until about CE 1600
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History: Leonhart Fuchs (1501‐1566)
German physician Baccalaureus Artium
(BA) 1524 ‐Magister Artium
(MA) 1524 ‐ doctor of
medicine (MD)
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History: Leonhart Fuchs (1501‐1566)
Fuchs’s History of Plants –1542
Offered botanical field days for the students
Demonstrated the use of medicinal plants in situ
Founded one of the first German botanical gardens
Plant and color Fuchsia are named for him by Charles Plumier
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History: John Gerard (1545‐1611 or 12)
Gerard’s Herbal or General Histoire of Plantes ‐ 1597
English herbalist
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History: Andrea Cesalpino (1519‐1603)
De plantis libri XVI ‐ 1583 Foundation for the
morphology and physiology of plants
First scientific classification of flowering plants
Used the fruit as the foundation of his botanical system
Made original, acute observations on flowers, fruits, and seeds before the discovery of the microscope
Genus Cesalpinia
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History: Gaspard Bauhin (1560 – 1624 )
Pinax theatri botanici(1596)
Classified thousands of plants
Used a precursor to binomial nomenclature
Bauhinia sp. is named for him
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History: John Ray (1627‐1705)
English naturalist Catalogus plantarum 626 plants listed Historia Plantarum Used system similar to
Bauhin First to use term
“species”
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History: Carl von Linne’ (1707‐1778)
Classify all known plants and animals according to their genera
Based on flower parts Used Latin phrases to
reflect relationships Placing one to many
kinds of species in each genus
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SystemaNaturae – 1735
Limited Latin phrase to 12 words
Abbreviated names to two parts (binomials).
Organized all known plants into 24 classes based mainly on the
number of stamens in flowers
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Kingdoms over time
Linnaeus1735[56]
Haeckel1866[57]
Chatton1925[58]
Copeland1938[59]
Whittaker1969[60]
Woese et al.
1990[61]
Cavalier‐Smith1998[54]
2 kingdoms 3 kingdoms 2 empires 4 kingdoms 5 kingdoms 3 domains 6 kingdoms
(not treated) Protista
Prokaryota Monera MoneraBacteria
BacteriaArchaea
Eukaryota
Protoctista Protista
Eucarya
Protozoa
Chromista
Vegetabilia Plantae PlantaePlantae Plantae
Fungi Fungi
Animalia Animalia Animalia Animalia Animalia
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Phylogenetic Tree of Life
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Taxonomy Today
Lumpers phenetics – classification of organisms based on overall similarity
Linneaus’s classification based on resemblances between organisms (not evolutionary relationships)
Splitters Phylogenetics (systematics, cladograms) ‐ study of evolutionary relatedness among various groups of organisms
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CLASSIFICATIONSConvenient groupings of plants
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Plant DivisionsInformal group Division name Common name
No. of living species
Green algaeChlorophyta
green algae(chlorophytes)
3,800
Charophytagreen algae(desmids & charophytes)
4,000 ‐ 6,000
Bryophytes Marchantiophyta liverworts 6,000 ‐ 8,000
Anthocerotophyta hornworts 100 ‐ 200
Bryophyta mosses 12,000
Pteridophytes Lycopodiophyta club mosses 1,200
Pteridophytaferns, whisk ferns & horsetails
11,000
Seed plants Cycadophyta cycads 160
Ginkgophyta ginkgo 1
Pinophyta conifers 630
Gnetophyta gnetophytes 70
Magnoliophyta flowering plants 258,650
https://en.wikipedia.org/wiki/Plant
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Plant Categories
Angiosperms (Magnoliophyta)
Monocots Dicots
Gymnosperms (Pinophyta) Conifers
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Classes
Grasses Grass‐like plants Sedges Bullrushes Rushes
Forbs Herbaceous flowering
plants
Woody plants
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Grasses
Jointed, hollow stems Leaves in 2 rows and
flattened Parallel venation Poaeaceae family Texas – 545 native
species Monocots
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Grass‐like Plants
Sometimes confused with grasses
Parallel venation No nodes Sedges triangular stems Flattened leaves in 3 rows
Ruses hollow or pithy Rounded and not branched Leaves near base of plant
are round or flattened
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Forbs
Broad‐leaf plants Herbaceous
flowering plant that is not a graminoid (grasses, sedges and rushes).
Not a tree, shrub Not always
wildflowers Alfalfa Soybean
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Woody Plants
Shrubs, sub‐shrubs and trees
Perennial Trees have a trunk ‘Brush’
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Life Cycles
Annuals Biennials Perennials herbaceous woody
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Seasonal Classification
Warm season Grow during frost‐free
months Spring, summer, fall
Cool season Tolerate frost Fall, winter, spring
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MORPHOLOGY AND PHYSIOLOGYPlant Parts and Functions
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Plant Parts & Functions
Sexual flower
Asexual leaves stems roots
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Meristems
Primary Growth apical
meristem or apex
Secondary Growth Vascular
cambium or cambium
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Roots
Primary Roots
Taproot Lateral
Roots Fibrous
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Roots
Knees Buttressed Aerial
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Tuberous Roots
No Nodes Begonias Beets Dahlias Peonies
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Root Structure
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Dicot Root
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Monocot Root
Monocot Root
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Tree Roots
Most trees do not have tap roots
Roots grow beyond the edge of the branches
Most roots are in the top 3 feet of soil
Finer roots in top 12”. Damaging roots may
cause dieback
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Stems
Support Vascular System Buds Leaf Bud Flower Bud Terminal Lateral/Axillary Adventitious
Leaves
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Stems
Support Vascular System Buds Leaf Bud Flower Bud Terminal Lateral/Axillary Adventitious
Leaves
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Primary Growth ‐Monocot
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Primary Growth – dicot or gymnosperm
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Secondary Growth ‐ dicots
periderm
phloem
cambium
xylem
ray
crushed cortex and past year’s phloem
32 1 pith
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Section of a Yew (Taxus sp.)
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Modified Stems ‐ Crowns & Stolon
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Modified Stems
Bulb
Tuber
Rhizome
Bulb
Corm
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Types of Leaves
Simple
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Types of Leaves
Seed Leaves(Cotyledons)
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Types of Leaves
Tendrils
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Types of Leaves
Scale
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Types of Leaves
Needles
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Types of Leaves
Spines
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Types of Leaves
Prickle
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Types of Leaves
Bracts Poinsettia Bougainvillea Abelia
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Types of Leaves
Thorns
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Leaves
Absorb sunlight for photosynthesis
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Leaf Layers
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Leaf Cross‐section
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Leaf Cross‐Section
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Stomata
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Leaf Venation
Reticulate
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Leaf Venation
Pinnate
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Leaf Venation
Palmate
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Leaf Venation
Parallel
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Leaf Types
Simple
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Leaf Types
Pinnate Compound
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Leaf Types
Double Pinnate Compound
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Leaf Types
Palmate Compound
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Leaf ShapesAcicularCordateDeltoidPeltateEllipticEnsiformFalcateHastateLanceolateLinearLigulateOblanceolateOblongObovateOrbicularOvalSagittateSpatulateSubulateTendril
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Leaf MarginsCiliateCrenateCrenulateDentateDenticulateEntireIncisedLobedPalmately lobedPinnately lobedPinnatisectSerrateSerrulateSinuateSpinseUndulate
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Leaf ApicesAcuminateAcuteApiculateAristateCaudateCirrhoseCleftCuspidateEmarginateMucronateMucronulateObcordateObtuseRetuseRoundedTruncate
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Leaf BasesAcute
Attenuate
Auriculate
Cordate
Cuneate
Oblique
Rounded
Truncate
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PubescenceGlabrousPiloseVillousStrigoseHispidHirsuleScabrousPuberulentTomentoseStellateStipitate GlandularSessile Glandular
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Leave Arrangement
Alternate
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Leave Arrangement
Opposite
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Leave Arrangement
Whorled
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Leaf Arrangement
Fasicled
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Leaf Arrangement
Basal
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Leaf Arrangement
Equitant
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SEXUAL PLANT PARTS & FUNCTIONS
(Flowers)
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Parts of the Flower
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Types of Flowering Plants
Monoecious = 1 House Corn Pecan
Dioecious = 2 Houses Holly Junipers
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Types of Flowering Plants
Monoecious = 1 House Corn Pecan
Dioecious = 2 Houses Holly Junipers
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Flowers
Complete = Pistil, Stamen, Petal, Sepals
Incomplete = Missing One
Perfect = Pistil & Stamen
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How Seeds Form
Pollination Pollen tube Fertilization
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Types of Flowers
Solitary ‐ one flower per stem Inflorescence ‐ a cluster of flowers racemous ‐ indeterminate (flower from the bottom up)
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Racemous Flowers
Spike ‐ flowers attached to peduncle ‐gladiolus
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Racemous Flowers
Raceme ‐ individual flowers attached by tiny stems to the peduncle Bluebonnet
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Racemous Flowers
Catkin Mulberry birch
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Racemous Flowers
Corymb yarrow
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Racemous Flowers
Umbel dill onion queen anne’s lace
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Racemous Flowers
Head sunflower daisy
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Flower Types
cyme ‐ determinate ‐flower from the top down ‐ top florets open first dischasium cyme ‐
baby’s breath helicoid cyme ‐ freesia scorpioid ‐ tomato
(alternate)
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Types of Inflorescence
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Fruit
Fruit consists of the fertilized and mature ovules (seeds) and the ovary wall.
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Parts of the Fruit
seed
dry fruit(corn) fleshy fruit (peach)
exocarp
mesocarp
endocarp
pericarp
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Types of Fruit
berry
pepo
pome
hesperidium
drupe
pod
aggregate
multiple
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Parts of the Seed
testa (seed coat)
hilum
micropyle
dicot seed (bean)
plumule
epicotyl
cotyledon
hypocotyl
radicle
embryo
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Bean Seed Germination
Water Light Heat Oxygen
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Corn Seed Germination
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PLANT PROCESSES
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Photosynthesis
Produces food Stores Energy Occurs only in cells
containing chloroplasts
Releases Oxygen Uses water Uses carbon dioxide Occurs in sunlight
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Light Cycle (Photolysis, Hill Reaction)
Light reacts with pigments in the leaf causing the splitting of water molecules.
Three products: Electrons from the
hydrogen molecules
H+ ions ‐ used to form two separate energy storage molecules.
Oxygen
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Dark Cycle (Calvin Cycle)
Carbon dioxide molecules are transformed into sugars using the energy that was formed during the light reaction.
C3 ‐ efficient C4 ‐more efficient (grasses) CAM ‐most efficient (succulents)
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Respiration
Uses food for plant energy Releases energy Occurs in all cells Uses oxygen Produces water Produces carbon dioxide Occurs in darkness as well as light
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Net Reaction
6 CO2 + 6H2O C6H12O6 + 6 O2
light
carbon dioxide
water Carbohydrate(sugar)
oxygen
energy for growth (ATP)
Photosynthesis
Respiration
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Transpiration
Process of water loss Occurs through the
stomata Uses 90% of water taken
up Necessary for cooling
and mineral transport Depends on: temperature wind humidity
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FACTORS AFFECTING PLANT GROWTH
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Light
Quality Quantity Duration Necessary for photosynthesis
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Light Quality
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Light Quantity
Intensity Summer vs. Winter Shade vs. Sun Equator vs Arctic Indoors vs Outdoors
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Light Duration
Photoperiod induces flowering, bud break etc.
Short Day = > 12 hours dark chrysanthemum, poinsettia
Long Day = < 12 hours dark California Poppy, beet, radish, lettuce
Day Neutral = doesn’t care
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Temperature
Productivity High Temperature increased respiration, transpiration
Low Temperature poor growth
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Temperature
Flowering ‐ Mums, Christmas Cactus, Daffodils, Tulips
Chilling Hours Peaches, Apples
Winter Injury USDA Zone Map
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Water
Photosynthesis Cohesion Theory Wilt (PWP) Managing Stress
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Plant Nutrition
Nutrition vsFertilization
Macro = N, P, K, Mg, Ca, S
Micro = Fe, B, Zn, Cu, Mn, Mo, Cl, Co
Absorbed as ions pH Foliar Absorption
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BOTANY
Carol Brouwer, Ph.D.Horticulturist