1. Anatomy of Zea Mays
By Amy Peterson
IB 423

2. Fast Corn Facts Native of Southern Mexico Grows over 2.5 m (8 feet)
C4 plant with a Kranz anatomical structure
Monocot
Grass
An 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.S

3. The Many Faces of Corn Insecticides
Latex paint
Shaving cream & lotions
Toothpaste
Check out for a zillion uses for 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…"

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

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

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

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

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

9. VASCULAR TISSUE Tylose Ray Sieve Plate Xylem Metaxylem Phloem
Methylene Blue X40
VASCULAR TISSUE
Tylose
Ray
Sieve Plate
Xylem
Metaxylem
Phloem
Sieve Tube Member
Methylene Blue X20
Methylene Blue X20
Parenchyma

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 X4 Longitudinal Section!
Methylene Blue X20 Cross Section
Methylene Blue X10 Cross Section

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

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

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

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

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

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

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

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

19. BIBLIOGRAPHY
Crang, Richard and Andrew Vassilyev. Plant Anatomy. McGraw-Hill.
Dickison, William. Integrative Plant Anatomy. Boston: Academic Press, 2000.
Esau, Katherine. Anatomy of Seed Plants. New York: John Wiley and Sons, 1977.
Esau, Katherine. Plant Anatomy. New York: John Wiley and Sons, 1967.
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 <www.
Webb, David T. Vegetative Features. University of Hawaii at Manoa. 04/25/2005 <