Nicotiana tabacum
description
Transcript of Nicotiana tabacum
Nicotiana tabacumNicotiana tabacumFalak BhattFalak Bhatt
IB 423IB 423May 4, 2005May 4, 2005
www.plantoftheweek.org
ClassificationClassificationDivision MagnoliophytaDivision Magnoliophyta
Class: MagnoliopsidaClass: MagnoliopsidaOrder: SolanalesOrder: Solanales
Family: SolanaceaeFamily: Solanaceae Genus: Genus: NicotianaNicotiana
DicotDicot
http://www.landlfinecigars.com
HistoryHistory Indigenous to North and South Indigenous to North and South
America America 1 BCE: Experts believe American 1 BCE: Experts believe American
inhabitants have begun finding ways inhabitants have begun finding ways to use tobacco, including smoking and to use tobacco, including smoking and chewing chewing
Native Americans smoked before Native Americans smoked before Europeans arrived in America, gave Europeans arrived in America, gave dried leaved as gift to Columbusdried leaved as gift to Columbus
Settlers brought habit back to EuropeSettlers brought habit back to Europe U.S. early colonies made most of U.S. early colonies made most of
internal revenue from tax of tobacco internal revenue from tax of tobacco exportexport
www.tobacco.org
http://www.research.att.com
RootRoot Dicot-Open Root System, FibrousDicot-Open Root System, Fibrous
Columella
Rhizodermis
Root Hair (w/ trichoblast)
Root Cap
Apical Meristem
Root tip 10x-TOL B
RootRoot•Tetrarch development
Phloem
Xylem
Pericycle
Root xs 20x Phloro.
Root: Secondary GrowthRoot: Secondary Growth
Primary Xylem
Secondary Xylem
Ray
Root xs 4x TOL B
Root xs 10x TOL B
RootRoot
Vascular Tissue
Trichome
Whole root 10x TOL B
StemStem•Bicollateral phloem
•Continuous vascular tissue
External Phloem
Internal Phloem
Xylem
Pith
Cortex- Parenchyma
Vascular Cambium
Stem xs 10x
Crang and Vassilyev
StemStem•Multicellular, uniseriate trichomes
Epidermis
Trichomes
Stem xs 10x
Stem xs 20x
Next up…LeavesNext up…Leaves
•Reticulate (netted) venation-Dicot
•Trichomes
Palisade Mesophyll
Spongy Mesophyll
•Bifacial
http://www.botgard.ucla.edu
Leaf xs 10x
LeavesLeaves
•Amphistomatic
•Simple
•Anomocytic stomatal arrangement
Adaxial Abaxial
Leaf peel 20x Leaf peel 20x
LeavesLeaves•Major Leaf Vein…Bicollateral view
Phloem
Xylem
Vascular Cambium
Phloem
Leaves: Gap and TraceLeaves: Gap and Trace
Leaf gap
Leaf trace
Outer endodermis
Inner endodermis
Stem xs 10x
Reproductive StructuresReproductive Structures
Sepal
Ovule Locule
Locules
Ovary Wall
Ovules
Optional Features
Bud xs
Ovary longitudnal
Reproductive StructuresReproductive Structures
Testa
•The embryo is surrounded by three to five layers of rather thick-walled endosperm cells in the mature seed. The periphery of the endosperm is pressed against the thin seed coat (testa), consisting of cutinized and lignified dead cells
Endosperm
Bud xs 10x
Reproductive StructuresReproductive Structures
Testa (seed coat)
Endosperm
Radicle
CotyledonsEMBRYO
http://www.leubner.ch/anatomy.html#
Secretory Structures & NicotineSecretory Structures & Nicotine•Tobacco leaves have 2 types of Trichomes
•Short stalked
•Nicotine
•Organic alkaloid and powerful neurotoxin
•Biosynthesis in roots, accumulate in leaves
•Long stalked
•Diterpeniods
Glover 2000
ReferencesReferences Crang, R & Vassilyev A. Crang, R & Vassilyev A. Plant AnatomyPlant Anatomy CD. 2003. CD. 2003. http://www.botany.org/ajb/00029122_di001557.htmlhttp://www.botany.org/ajb/00029122_di001557.html http://images.botany.org/set-14/http://images.botany.org/set-14/ http://www.leubner.ch/anatomy.html#http://www.leubner.ch/anatomy.html# www.tobacco.orgwww.tobacco.org www.plantoftheweek.orgwww.plantoftheweek.org http://www.landlfinecigars.com http://www.research.att.com http://www.botgard.ucla.edu Glover, Beverley J. Differentiation in plant epidermal cells.
Journal of Experimental Botany. Vol. 51, No. 344, pg 497-505, March 2000.