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Nicotiana tabacum

Nicotiana tabacum. Falak Bhatt IB 423 May 4, 2005. www.plantof theweek.org. Classification. Division Magnoliophyta Class: Magnoliopsida Order: Solanales Family: Solanaceae Genus: Nicotiana Dicot. http://www.landlfinecigars.com. History. Indigenous to North and South America

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Nicotiana tabacum

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  1. Nicotiana tabacum Falak Bhatt IB 423 May 4, 2005 www.plantoftheweek.org

  2. Classification Division Magnoliophyta Class: Magnoliopsida Order: Solanales Family: Solanaceae Genus: Nicotiana • Dicot http://www.landlfinecigars.com

  3. History • Indigenous to North and South America • 1 BCE: Experts believe American inhabitants have begun finding ways to use tobacco, including smoking and chewing • Native Americans smoked before Europeans arrived in America, gave dried leaved as gift to Columbus • Settlers brought habit back to Europe • U.S. early colonies made most of internal revenue from tax of tobacco export http://www.research.att.com www.tobacco.org

  4. Root Root Hair (w/ trichoblast) • Dicot-Open Root System, Fibrous Rhizodermis Apical Meristem Root Cap Columella Root tip 10x-TOL B

  5. Root • Tetrarch development Phloem Xylem Pericycle Root xs 20x Phloro.

  6. Root: Secondary Growth Ray Secondary Xylem Root xs 10x TOL B Primary Xylem Root xs 4x TOL B

  7. Root Vascular Tissue Trichome Whole root 10x TOL B

  8. Stem • Bicollateral phloem • Continuous vascular tissue Crang and Vassilyev Cortex- Parenchyma External Phloem Vascular Cambium Xylem Internal Phloem Pith Stem xs 10x

  9. Stem • Multicellular, uniseriate trichomes Trichomes Stem xs 20x Epidermis Stem xs 10x

  10. Next up…Leaves • Bifacial http://www.botgard.ucla.edu • Reticulate (netted) venation-Dicot • Trichomes Palisade Mesophyll Spongy Mesophyll Leaf xs 10x

  11. Leaves Leaf peel 20x Leaf peel 20x Abaxial Adaxial • Amphistomatic • Simple • Anomocytic stomatal arrangement

  12. Leaves • Major Leaf Vein…Bicollateral view Phloem Vascular Cambium Xylem Phloem

  13. Leaves: Gap and Trace Outer endodermis Inner endodermis Stem xs10x Leaf trace Leaf gap

  14. Optional Features Reproductive Structures Ovules Locules Ovary longitudnal Ovary Wall Sepal Ovule Locule Bud xs

  15. Reproductive Structures Endosperm 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 Bud xs 10x

  16. Reproductive Structures EMBRYO Cotyledons Radicle http://www.leubner.ch/anatomy.html# Endosperm Testa (seed coat)

  17. Secretory 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

  18. References • Crang, R & Vassilyev A. Plant Anatomy CD. 2003. • http://www.botany.org/ajb/00029122_di001557.html • http://images.botany.org/set-14/ • http://www.leubner.ch/anatomy.html# • www.tobacco.org • www.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.

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