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Anatomy of Anatomy of
Pisum Sativum Pisum Sativum (garden pea)(garden pea)
by
Wannasiri Wannarat
Characters of Pisum sativumKingdom Plantae Class Magnoliopsida Order Fabales
Family Fabaceae Genus Pisum L.
Species Pisum sativum L. -- garden pea (USDA website,2006)
Angiosperm (Dicot plant) Annual plant (cultivation during cool
season) edible seeds a climbing stem which grows as tall
as 6 feet self-fertilization (female and male
are from the same flower)
Leaves
Tendrils
Guard cell
Stipules (leaflike appendages)
Pinnately Compound
Guard cell
(20x)
No Subsidiary cells (Anomacytic )
Stomata
stomatal complexes
An epidermal section
A paradermal section
Mid vein
Guard cell
Plastids
Minor vein
Major vein
Palisade parenchyma
Reticulated venation
(4x)(60x)
XS of bladeUpper epidermis
Lower epidermis
Tracheary element
Spongy parenchyma
Palisade parenchyma
(40x)
Bifacial leaf
XS of Mid veinUpper epidermis
Lower epidermis
Xylem
Fibers
Phloem
(60x)
(20x) Fibers
Stomata
XS of tendrilXylem
FibersPhloem
Epidermis
Modified leaf
(4x)
(20x)
(60x)
Mesophyll cells
Parenchyma cells
XS of Stem Eustele ( lyzogenous pith)
(4x)
Epidermis
Cortex
Discrete vascular bundle
Primary vascular tissue
(20x)
Discrete vascular bundleInterfasicular region
Protoxylem
Metaxylem
Primary phloem
Fascicular cambium
XS of vascular bundleOpened collateral vascular bundle
Endarch primary xylem pattern
Metaxylem
Fibers
Epidermis
Parenchyma cells
(20x)
Crushed protoxylem
Primary phloem
Primary phloem
(60x)Companion cell
Phloem
(40x)
Sieve cell
Fibers
Metaxylem
LS vs. XS of stem
1=Protoxylem, 2=Metaxylem, 3=Promary phloem, 4= Fiber
1
Secondary wall thickening
23
4
parenchyma
42 3
4
Epidermis
Mesophyll cells
(20x)(20x)
1
LS of primary xylem
( 40x)
Helical thickening
Pits
ProtoxylemMetaxylem
Stomata
(60x)
Angular
(4x)
(40x)
Collenchyma Collenchyma tissue
Leaf gap Leaf gap
xylem
Leaf trace
Branch trace
LS of root
Root hairs (trichoblasts)
Endogenous
Vascular cylinder
Root primodia
Rhizodermis
Cortex
(4x)
(20x)
Root primodium
apical meristem
Pericycle
Cortex
Primary xylem
Crushed endodermis
Vascular cylinder
(20x)
Parenchyma
Branch root
Vascular tissue
Rhizoderm
Cortex
Root hairs
(4x)
Branch root (cont.)
Curshed Protoxylem
Metaxylem
Fibers
(10x)(20x)
Vascular tissue (xylem)
Primary phloem
Primary state of root
Primary xylem pattern : triarch (exdarch)
Protoxylem Metaxylem
EndodermisPericycle
Cortex
Primary phloem
(4x)
(40x)
Flower bud
Anther
(4x)
Male reproduction
Anther Tetrads of microspores
Callose wall
Microspore
Locule
(20x) (40x)
Hydrothode ?
Stoma
xylem
(40x)
(4x)
references1. USDA website. 04/28/06.
<http://plants.usda.gov/java/ClassificationServlet?source=profile&symbol=PISA6&display=31>
2. Berg, L.R. (1997). Introductory Botany Plant, People & The environment (1st edition). Brooks/Cole-Thomson Learning, USA.
3. Raven, P.H., R.F.Evert, and S.E. Eichhorn. (2003). Biology of Plants (6th edition). W.H. Freeman and company, New York, USA.
4. Esau, K. (1976). Anatomy of seed plants (2nd edition). John Wiley & Son, Khundlli, India.