Domain Eukarya Kingdom Plantae What makes a plant
- Slides: 119
Domain Eukarya Kingdom Plantae What makes a plant? • Cell wall primarily of cellulose • Starch as primary photosynthetic storage product • Multicellular with complex specialized tissue development • Chl a, Chl b, xanthophylls, carotenoids
Plant evolution simplified Radiates from simple to more complex – in both form and environments • Seedless non-vascular • Seedless vascular • Seed producing, vascular, fruits/flowers
Semi-aquatic to more terrestrial • Ancestral “plants” transitions to primitive plants – Requirements met from aquatic environment • Gas, water, light, buoyancy support • Complex plants – Adapt to two environments • Shoot system • Root system
Plants: categorized by structures and lifecycles… Alternation of Generations
Moss sporophytes and gametophytes sporophytes gametophytes
Moss antheridia Sperm
Moss antheridia w/sperm
Moss archegonia ovum
Moss archegonia 2 ova
Moss archegonia 3
Moss sporophytes
Operculum Moss capsule (sporophyte) Spores
Liverwort
Liverwort antheridiophore
Liverwort antheridiophore 2
Liverwort antheridia Antheridiophore sperm
Liverwort antheridia w/sperm
Liverwort archegoniophore
Liverwort archegonia w/ova Archegoniophore ovum Archegonium
Liverwort sporophyte Archegoniophore
Liverwort sporophyte 2 spores
Liverwort gemmae cups(cupules)
Gemmae cups (cupules) Gemma cup (cupule) gemma
Hornwort sporophytes gametophyte
Hornwort 2 “Horn –like” Sporophyte gametophyte
Tracheophytes • Ferns and “fern allies” • Seedless • Vascular plants – Xylem composed of Tracheids – tapered porous cells • capillary action moderately efficient • Sporophyte dominant ancestral e. g. Rhyniophyta
Psilophyta
Psilophyta gametophyte
Lycophyta strobila leaves
Lycophyta strobilus microspores sporophylls megaspores
Lycophyta strobilus 2 Megaspores megsporangium Microspores
Lycophyta gametophyte
Sphenophyta strobilus
Sphenophyta strobilus
Sphenophyta gametophyte
Pterophyta sporophyte
Pterophyta sporophyte 2
Fern frond w/ sori
Sori on fern leaflets
Sorus
Fern sporangia Spores Annulus Sporangium
Fern sporangia and spores
Fern gametophyte
Fern gametophyte
Gametophyte w/antheridia Gametophyte (prothallus) Antheridia sperm
Antheridia w/sperm Antheridium sperm
Gametophyte w/archegonia Archegonia
Gametophyte w/archegonia 2 Archegonia
Archegonia on surface of prothallus
Fern sporangium and prothallus Sporophyte Gametophyte (prothallus)
Fern Life Cycle
Seed producing plants Gymnosperms Angiosperms • Sporophyte dominant • Conifers & relatives • Heterosporous • Sporophyte dominant • Flowering plants • Heterosporous – Mega- and micro– Small gametophye matures in protected cones – Mega- and micro– Small gametophye matures in protected flowers • Female in ovulate cones • Male in staminate cones • Female in flower ovary • Male in flower anthers – Wind blown-pollen • Seeds protected in ovulate cone – Dispersed by wind, animal, water sometimes – Animal pollination and some wind-blown • Seeds protected in fruit – Dispersed by animal mostly
Seed? • • Ovule to seed Ovule: sporophyte tissue surrounding sporangia Seed coat: protective diploid tissue Embryo: diploid zygote develops to sporophyte Endosperm: nutritive tissue surrounding embryo to feed it until it can photosynthesize on its own
Evolutionary importance of Seeds • These plants produce pollen – Pollen produces sperm nuclei (no water requrd) • Expand over drier habitats – Very protective over seasons (dormancy) • Endosperm (embryonic food) – headstart • Seed dispersal not dependent on water – Collected and distributed further • Flowering plants…even further in fruits
Pine lifecycle a
Pine lifecycle b
Pinus staminate cones
Pinus Ovulate cone (mature)
Staminate cone with pollen Pollen grains (microspores or micorgametophytes)
Pinus microgametophytes (mature pollen grains) “Wing” Tube nucleus Generative nucleus
Pinus ovulate cone ovule megasporophyll
Pinus megasporophyll Megaspore mother cell Megasporophyll
Ovule w/megaspore mother cell Megaspore mother cell Ovule
Pinus Megagametophyte Ovule Ovum
Pollen tubes
Pollen tube 2 Ovule (megagametophyte)
Pinus seed Haploid endosperm (gametophyte tissue)
Cycadophyta (male)
Cycadophyta
Cycadophyta ovulate cones
Ginkgophyta
Ginkgophyta leaves
Ginkgo ovules/seeds (naked) ovules (naked) seeds
Ginkgo staminate cones
Gnetophyta Welwitschia mirabilis • found in Angolan desert • “desert onion”
Gnetophyta/Ephedra
Angiosperms /Anthophyta • • Flowering Plants (anth = flower) Seeds in a fruit (angio = container) Double fertilization (see life cycle) Like other pollen producers, is not dependent on water for fertilization
What is a flower?
Flower structure (corolla) (carpel) (calyx)
Plants: • Monecious – Has both sexes • Dioecious – Separate sexed plants Flowers: • • Perfect Imperfect Complete Incomplete Regular Irregular Inflorescences
Anther 1
Anther 2
Dehiscing anther Pollen grains
Angiosperm lifecycle
Mature pollen grains
Lilium ovary (immature)
Lilium ovule Megagametophyte (embryo sac) funiculus
A= plumule B= hypocotyl Dicot Seed C = cotyledon D = testa E = radicle E
Dicot seed germination Radicle
Monocot seed Embryo Testa Cotyledon Endosperm Plumule Radicle
Monocot seed germination
Vascular tissue • Transport water, nutrients and food between roots and shoots • System of xylem and phloem cells • Varied organization in roots & shoots
Xylem cells – mature cells that become lignified (thickened 2 o cellulose), dies, and perforates from lysosomes • Tracheids – Primitive vascular plants – Tapered, pits on ends, less capillary action vs. vessel elements • Vessel elements – – Less primitive vascular plants Pits on sides, open ends Stacked to form long tubes Advanced capillary action • Transpiration – Roots → shoots → leaves → out – Via: root pressure and diffusion, capillary pressure, negative pressure of evaporation and cohesion
Phloem cells – living cells that transport sugars (sap) • Sieve tubes – no nucleus nor organelles – Open sieve plates • Companion cells – Nucleated – Adjoined to sieve tubes via plasmodesmata – Controls sieve tubes; regulates movement • Translocation – Movement of sugars; sources to sinks leaves → roots, fruits, &/or meristems
Plant Structure • Apical meristem – Mitotic division – Stem & root tips – Primary growth (length) • Ground meristem – Mitotic division – Ground tissues: • Parenchyma – large; storage • Collenchyma – smaller; flexible support • Schlerenchyma – lignified; rigid support; woody • Cambium – Mitotic secondary growth – e. g. Vascular cambium – e. g. Cork cambium
Leaf bud Ground meristem
Leaf bud 2 Apical meristem Ground meristem Provascular tissue
Monocot root • Vascular bundles centered in roots • Cortex = outer layer • Pith = center tissue • Stele = pith + vascular tissue Dicot root
Monocot root 2 Parenchyma Pith (Parenchyma)
Monocot root 3 Endodermis
Dicot root 2 Parenchyma
Dicot root 3 Endodermis and casparian strip Pericycle Phloem Xylem Vascular cambium
• Vascular bundles – Xylem, phloem, and cambium in between – Scattered throughout monocot stems – Organized around periphery of dicots • Cambium – Mitotic secondary growth – e. g. Vascular cambium – e. g. Cork cambium
Monocot stem
Monocot stem 2 Sclerenchyma Outside Phloem Sieve element Companion cell Xylem vessel Air space Inside
Dicot stem
Dicot stem 2 phloem sclerenchyma Vascular cambium
Woody stem Summerwood Springwood
Woody stem 2 Cork Vascular cambium Phloem ray Xylem
Woody stem 3 Cork (collenchyma tissue) Vascular cambium
Fruit – ripened ovary that protects the seeds • Ripened? • Layers of the ovary = Pericarp – Exocarp • Outer layer /ovarian wall – Mesocarp • Middle layer – Endocarp • Inner/adjacent to ovules
Fleshy fruits • One or more ovarian layer is fleshy – Drupe • Endocarp is hardened; pit or stone • Peaches, nectarines, apricots, etc – Berry • All or most pericarp is fleshy • Grape, tomato, etc – Pepo • Berry with hard thick rind • Melons, pumpkins, etc – Hesperidium • Berry with leathery rind • Citrus – Pome • Swollen receptacle around ovary or core • Apple, pear
Dry fruits • Lacks fleshy tissue – Dehiscent fruits • Split along a seam to disperse seeds • Legumes – two seams • Capsules – multiple seams • Bean, pea pods, peanuts, etc – Indehiscent • Do not split on a seam • Achenes, grains, nuts • Corn, wheat, etc
• Simple fruits – Single ovary of one flower • Aggregate fruits – Many ovaries of one flower • Multiple fruits – Many ovaries of many clustered flowers (inflorescence) • Accessory fruits – Tissue other than ovary ripens (swollen)
What is a coconut? Fleshy? Dry? Other? Drupe: a single fleshy fruit with a hard stone which contains the single seed
Plant Hormones (Ch. 39) chemical communication and regulation • Auxins – Cell elongation – Apical dominance – Abscission suppression • Slows the shedding of leaves, flowers, fruits – Fruit maturation – Geotropism • Phototropism • Gravitropism A. The tips have been removed. No auxin is produced and the shoots do not grow longer. B. The tips have been covered so light cannot reach them. Auxin is in the same concentration on both sides of the shoots, so they grow longer evenly on both sides. C. One side of the tips are in more light than the other side. Auxin is in a greater concentration on the shaded side, causing the cells there to grow longer than the cells on the light side.
Plant Hormones (Ch. 39) chemical communication and regulation • Giberellins – GA or Giberellic acid – Growth • Release some buds and seeds from dormancy • Dwarf plants lack GA – Spray on grapes = bigger grapes • Stem elongation – Spray on dwarf plants = taller plants • Related to flowering in some plants Sold as common bio-fertilizer
Plant Hormones (Ch. 39) chemical communication and regulation • Cytokinins – Cell division – Stimulate bud growth – Stimulates fruit & embryo development – Prevents leaf senescence • Slows aging to decay With & without
Plant Hormones (Ch. 39) chemical communication and regulation • Abscisic Acid – General growth inhibitor – Induces dormancy • Wintering of buds and leaves – Closure of stomata • Ethylene – Gaseous hormone – Plays role in fruit ripening – Fruit abscission • (shedding) – One of the reasons why ripe bananas will “ripen” other fruits
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