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.