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Anatomy of Zea Mays By Amy Peterson IB 423. Fast Corn Facts Native of Southern MexicoNative of Southern Mexico Grows over 2.5 m (8 feet)Grows over 2.5.

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Presentation on theme: "Anatomy of Zea Mays By Amy Peterson IB 423. Fast Corn Facts Native of Southern MexicoNative of Southern Mexico Grows over 2.5 m (8 feet)Grows over 2.5."— Presentation transcript:

1 Anatomy of Zea Mays By Amy Peterson IB 423

2 Fast Corn Facts Native of Southern MexicoNative of Southern Mexico Grows over 2.5 m (8 feet)Grows over 2.5 m (8 feet) C4 plant with a Kranz anatomical structureC4 plant with a Kranz anatomical structure MonocotMonocot GrassGrass An ear of corn averages 800 kernels in 16 rowsAn ear of corn averages 800 kernels in 16 rows Iowa, Illinois, Nebraska and Minnesota account for over 50 percent of the corn grown in the U.SIowa, Illinois, Nebraska and Minnesota account for over 50 percent of the corn grown in the U.S

3 The Many Faces of Corn As author Margaret Visser put it in her book, "Much Depends on Dinner," "You cannot buy anything at all in a North American supermarket which has been untouched by corn…"As author Margaret Visser put it in her book, "Much Depends on Dinner," "You cannot buy anything at all in a North American supermarket which has been untouched by corn…" InsecticidesInsecticides Latex paintLatex paint Shaving cream & lotionsShaving cream & lotions ToothpasteToothpaste Check out org/classroom/products. html for a zillion uses for corn!Check out org/classroom/products. html for a zillion uses for corn! org/classroom/products. html org/classroom/products. html

4 Starting with the Root... Coleoptile Methylene Blue X4 Coleoptile- Sheath coming from the embryo interpreted as the first leaf of the epicotyl Fibrous root system

5 Closed Root Apical MeristemClosed Root Apical Meristem Distinct Root Cap MeristemDistinct Root Cap Meristem called Calyptrogen called Calyptrogen Calyptrogen Root Cap Protoderm Region of Initials Zone of Elongation Water X4 Simmons ©

6 Water X4 TRICHOBLAST ATRICHOBLAST ROOTHAIR Water x10 XYLEM PHLOEM ENDODERMIS PERICYLE CORTEX POLYARCH VASCULAR BUNDLE ARRANGEMENT

7 Branch Roots Branch Root Cortex Pith Methylene Blue X4 Water X4 Parenchyma pith Methylene Blue X4

8 MOVING UP TO THE STEM… Water X10 Water X4 Water X10 Xylem Scattered Vascular Bundles Curled Leaf attached to main stem

9 Methylene Blue X20 Parenchyma MetaxylemPhloem Methylene Blue X40 Tylose VASCULAR TISSUE Xylem Sieve Plate Ray Sieve Tube Member

10 The xylem and phloem do not just go straight up and down but actually meet at nodes up the stem. Here are some pictures of intersections, where vascular bundles are both seen longitudinally and in cross section Methylene Blue X10 Cross Section Methylene Blue X4 Longitudinal Section! Methylene Blue X20 Cross Section

11 Emerging Leaf and Shoot Apical Meristem Water X4 Webb © Tunica Corpus Emerging Leaf Stem Leaf Primordia Shoot Apical Meristem

12 AND SHIFTING OVER TO THE LEAVES... ParallelVenation Parallel Venation Commisural Veins Bundle Sheath Xylem Methylene Blue X10

13 Bulliform Cells Leafs are layered around the stem Water X20 Metaxylem Sclerenchyma Phloem Lacuna Protoxylem Methylene Blue X10 Collenchyma

14 Methylene Blue X20 Methylene Blue X10 Leaf Trace A distichous arrangement

15 Stomata Water X10 Peel X20 Stomates IV-2 Lapaseria Rosea arrangement Amphistomatic Bifacial

16 REPRODUCTION Root (Radicle) Plumule Cotyledon (Scutellum) Same thing in XS Endosperm Cotyledon Shoot Apex Coleoriza Lower part of embryo axis is a radicle Coleoriza is a sheath that encloses radicle Plumule is the embryotic shoot

17 IKI X20 IKI X10 STARCH Starch concentrated in seeds, like these in corn kernels Stained with IKI Arise from plastids Typical starch grain shape/appearance

18 Tassels Water X10 Monoecious Self and cross-pollinating Male Reproductive Structure Each tassel consists of a floret with three stamens

19 BIBLIOGRAPHY Crang, Richard and Andrew Vassilyev. Plant Anatomy. McGraw-Hill. Dickison, William. Integrative Plant Anatomy. Boston: Academic Press, Esau, Katherine. Anatomy of Seed Plants. New York: John Wiley and Sons, Esau, Katherine. Plant Anatomy. New York: John Wiley and Sons, Hochholdinger, Frank. 03/25/2004. Genetic analysis of Root Formation in Zea Mays. University of Tübingen. 04/25/2005. Sengbusch, Peter V. Root Tip of Zea Mays. University of Hamburg. 04/25/2005 . Simmons, Kent. Internal Anatomy of Roots. University of Winnepeg. 04/27/2005. Webb, David T. Vegetative Features. University of Hawaii at Manoa. 04/25/2005.


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