lesson 1 bio101 (c)dr. evangelista
TRANSCRIPT
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Lecture#1
INTRODUCTIONTOPLANTANATOMY
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Introduction
Definition• Plantanatomy–thestudyoftheinternalstructureofvariouspartsoftheplant
Applicationsofplantanatomy• Taxonomicapplication
– e.g.problemplants
• Properauthenticationofcrudedrugmaterial– Forsafetyandqualitytobemaintained– MorphologyandanatomyofdrugsourceispublishedinBritishandEnglishpharmacopoeias
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Introduction
Applicationsofplantanatomy• Avoidsfoodadulterantsandcontaminants
Sambong (Blumea balsamifera L)
Mango (Mangifera indica L)
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• FORENSIC APPLICATIONS Forensic botany refers to the use of plant materials to help solve crimes or resolve other legal problems.
The first botanical testimony to be heard in a North American court concerned the analysis of the wood grain of the ladder used in the kidnapping of Charles Lindbergh Jr., and led to the conviction of Bruno Hauptmann for the crime in 1935.
Xylotomist Arthur Koehler of the United States Forest Service undertook a meticulous examination of the ladder and when the case finally came to trial four years later, offered the first botanical testimony ever to be heard and accepted in American courts.
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LIVING ORGANISMS
Prokaryotes
Kingdom Monera
Eukaryotes
Unicell/simple multicellular organisms
Kingdom Protista
Multicellular organisms
Autotroph
Kingdom Plantae
Heterotroph
Saprophytes
Kingdom Fungi
Ingestion of other organisms
Kingdom Animalia
The five-kingdom system prevailed in biology for over 20 years.
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LIVING ORGANISMS
• During the last three decades, systematists applying cladistic analysis, including the construction of cladograms based on molecular data, have been identifying problems with the five-kingdom system.
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WHAT IS A PLANT? A multicellular, eukaryotic, photosynthetic
autrotroph.
With cell walls made mostly of cellulose
Stored food in the form of starch
Chlorophyll a directly involved in the conversion of light energy to chemical energy
Chloroplasts contain chl b as accessory pigment
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Kingdom Plantae
Vascular Non-Vascular
Bryophyta- Mosses
Hepatophyta-Liverworts
Anthocerophyta-Hornworts With seeds
(Phanerogams)
Without seeds
(Cryptogams)
Psilotophyta
Lycophyta
Sphenophyta
Pteridophyta
Naked seeds
Coniferophyta
Cycadophyta
Ginkgophyta
Gnetophyta
Covered seeds
Anthophyta
Monocots Eudicots
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Kingdom Plantae Bryophytes (Mosses and allies)
Small plants that lack true roots, stems and leaves
They lack vascular tissue
Water is necessary for the transfer of sperm prior to fertilization
Gametophyte is dominant and nutritionally independent
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Kingdom Plantae Bryophytes (Mosses and allies) Sporophyte is permanently attached to
the gametophyte and dependent upon it for water and minerals
Sex organs and sporangia are multicellular and have an outer layer of sterile cells
Chlorophyll a and b and carotenoids are present in the plastids
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The first true land plants, a cuticle is present
Influential in soil development by their participation in plant succession, assists in preventing soil erosion
Kingdom Plantae Bryophytes (Mosses and allies)
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Kingdom Plantae
Vascular Non-Vascular
Bryophyta- Mosses
Hepatophyta-Liverworts
Anthocerophyta-Hornworts With seeds
(Phanerogams)
Without seeds
(Cryptogams)
Psilophyta
Lycophyta
Sphenophyta
Pterophyta
Naked seeds
Coniferophyta
Cycadophyta
Ginkgophyta
Gnetophyta
Covered seeds
Anthophyta
Monocots Eudicots
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Division Psilophyta (whisk fern)
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Division Psilophyta (whisk fern)
Sporophyte have scalelike leaves (enations)
No roots
Dichotomously branched
Terminal sporangia (synangium, plural synangia)
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Division Psilophyta (whisk fern)
Homosporous – with only one type of meiospore
Water is necessary for transfer of sperm previous to fertilization
Both sporophyte and gametophyte are nutritionally independent
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Division Psilophyta (whisk fern) Sex organs and sporangia are multicellular
and have an outer layer of sterile cells
• Genera: Psilotum, Tmesipteris
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Division Lycophyta (club mosses)
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Division Lycophyta (club mosses)
• Sporophytes may be homosporous or heterosporous (two kinds of meiospores)
• Have roots, stems and small leaves
• Single sporangia are borne on the upper surface of leaves (sporophylls) which are arranged in the form of a cone or strobilus
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Division Lycophyta (club mosses)
• Water is necessary for fertilization to occur
• The sporophyte is dominant over gametophyte
• Both sporophyte and gametophyte are nutritionally independent
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Division Lycophyta (club mosses) • Sex organs and sporangia are multicellular
and have an outer layer of sterile cells
• Genera: Lycopodium, Selaginella
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Division Sphenophyta (Horsetails)
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Division Sphenophyta (Horsetails)
Sporophytes have roots, stems, and small leaves
The leaves and branches are whorled
The stem is hollow, jointed and contains silica
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Division Sphenophyta (Horsetails)
Groups of sporangia are borne on stalked, umbrella-like structures, which are grouped to form strobili
Sporophyte is the dominant phase
The gametophyte is small and both are nutritionally independent
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Division Sphenophyta (Horsetails)
Elaters are present on meiospores
Water is necessary for sperm transfer
Sex organs and sporangia are multicellular and have an outer layer of sterile cells
Genus : Equisetum
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Division Pterophyta (Ferns)
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Division Pterophyta (Ferns)
The dominant sporophyte usually have roots, stems and large leaves
Leaves are typically compound and uncoil as they develop (circinate vernation)
Roots are typically adventitious from a horizontal rhizome
Most are homosporous
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Division Pterophyta (Ferns)
The gametophyte is nutritionally independent, like the larger sporophyte
Water is necessary for fertilization by swimming sperm
Sex organs and sporangia are multicellular and have an outer layer of sterile cells
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Division Pterophyta (Ferns)
Sporangia are borne on the lower surface of leaves or sporophyll
Genera: Polypodium, Pteris, Adiantum
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Kingdom Plantae
Vascular Non-Vascular
Bryophyta- Mosses
Hepatophyta-Liverworts
Anthocerophyta-Hornworts With seeds
(Phanerogams)
Without seeds
(Cryptogams)
Psilotophyta
Lycophyta
Sphenophyta
Pteridophyta
Naked seeds
Coniferophyta
Cycadophyta
Ginkgophyta
Gnetophyta
Covered seeds
Anthophyta
Monocots Eudicots
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has fanlike leaves that turn gold before they fall off in the autumn.
Phylum Ginkgophyta consists of only a single extant species, Ginkgo biloba.
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Phylum Cycadophyta (Cycads) superficiallyresemblepalms. plantsareheterosporous Genus:Cycas,Zamia
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Phylum Gnetophyta
Traits are intermediate between gymnosperms and angiosperms
With vessels in xylem
The ovules are surrounded by 2 integuments
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Phylum Gnetophyta
Pollen-producing structures superficially resemble stamens
Seeds naked; fruits absent
Consists of three very different genera.
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Phylum Gnetophyta
• Weltwitschia, from deserts in southwestern Africa, have straplike leaves.
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Phylum Gnetophyta • Gnetum species are tropical trees or vines
(mainly climbing lianas), the leaves very much like dicots
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Phylum Gnetophyta
Ephedra (Mormon tea), shrub of the American deserts with whorls of small deciduous leaves)
– .
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Division Coniferophyta
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Division Coniferophyta
Have roots, stems and large leaves
Leaves are usually evergreen needles or scales
Heterosporous (produce 2 kinds of meiospores)
Gametophytes are nutritionally dependent on the sporophyte
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Division Coniferophyta
Wind pollinated; pollen tubes are formed
Genera: Pinus, Abies (Firs), Tsuga
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Division Coniferophyta Conifer sporophyte
All species of pines are trees
Conifer wood has no vessels
Typically with resin ducts
With sieve cells and albuminous cells in the phloem
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Division Coniferophyta
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Division Coniferophyta
Ovulate (Seed) Cones Develop at tips of young branches
Two ovules, each enclosing a single megasporangium, develops on the upper surface of an ovuliferous scales
An ovule consists of : outer integument, nucellar tissue and the female gametophyte; at one end are several archegonia
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Division Coniferophyta
Fertilizationisachievedbyunionofspermwithanegg;normallyonlyoneembryosurvive
Thematureembryoconsistsofseveralcotyledons,radicle,epicotylandhypocotyls
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DivisionAnthophyta(Floweringplants)
Dominant sporophytes have roots, stems and leaves
Sporangia borne on stamens and carpels
Seeds develop from ovules which are enclosed by carpels
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DivisionAnthophyta(Floweringplants)
The gametophytes are very reduced and dependent upon the sporophyte
Female gametophyte retained within the sporangium
Wind or insect pollinated
Double fertilization occurs
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Eudicots- With 2 cotyledons, flower parts in multiples of 4s or 5s, leaves are net-veined, cambium is usually present
Monocots- With one cotyledon, flower parts in multiples of 3s; the leaves are parallel-veined, a cambium is usually lacking
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• Whilemostangiospermsbelongtoeitherthemonocots(65,000species)oreudicots(165,000species)severalothercladesbranchedoffbeforethese.
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