Roselyn Aperocho-NaranjoPharmacy InstructorUSPF, College of Pharmacy

Anatomy of the Leaf

What are the layers of the Leaf?

thin superficial skin of a leaf

outer layer of the leaf

set of cells forming the central layer of a leaf

part of the stomalower layer of the leaf

organ of the leaf that allows the exchange of gases

line outlining a leaf division

set of cells forming the upper and lower layers of a leaf

What are the parts of the plant responsible for the gas exchange?

Photosynthesis

What are the substances responsible for the color of the leaf?

Four leaf pigmentsFour leaf pigments are responsible for leaf color and its changes in during autumn:

chlorophylls, carotenoids, tannins, and anthocyanins.

What are the substances responsible for the color of the leaf?

ChlorophyllChlorophyll located in organelles called

chloroplasts gives leaves green color absorbs the sun's radiant energy

and is necessary for photosynthesis

carbon dioxide and water are transformed to sugars

During the growing season, chlorophyll is continually being produced and destroyed and leaves appear green.

What are the substances responsible for the color of the leaf?

Anthocyanins Anthocyanins responsible for the pink and purple

leaves of sugar and red maple, sassafras, sumac, white and scarlet oak, winged euonymus, dogwood, sourwood, some oaks, and many other woody plants

also give color to cranberries, red apples, concord grapes, blueberries, cherries, strawberries, and plums

are formed when sugars combine with complex compounds called anthocyanidins

this is influenced mainly by cell pH usually not present until they are

produced in the autumn

What are the substances responsible for the color of the leaf?

CarotenoidsCarotenoids responsible for the yellow and

orange colors in leaves and also appear in such plants as corn, carrots, daffodils, rutabagas, buttercups, and bananas

located in the chloroplasts and assist chlorophyll in the capture of sunlight for photosynthesis

What are the substances responsible for the color of the leaf?

Tannins Tannins responsible for the brown hues in the

leaves of some oaks and other trees golden yellow in some leaves such

as beech are a result of tannins being present along with the yellow carotenoid pigments

always present in the leaves, but only become visible as chlorophyll ad carotenoids disappear from leaves

are bitter substances responsible for the color and flavor of tea

are common waste products of tree metabolism, deposited in the cell sap inside the vacuole as well as in cell walls

ANATOMY

OF THE STEM

is responsible for the aboveground structure of the

plant, and is involved in both

structural support and

vascular transport.

THE STEMthe tissue layers :

dead center of the woody stem in which conducting elements of xylem are clogged with tannins and resin, and no longer function to conduct fluids.

external ring of xylem still conducting fluids

outer covering of the stem of woody plants, composed of waterproof cork cells protecting a layer of food-conducting tissue—the phloem or inner bark (also called bast).

A layer of reproductive cells called the cork cambium produces new cork cells to replace or reinforce the old cells

THE ROOTS

Root systems may be divided into two broad types: TAPROOTS and FIBROUS ROOTS:

TAPROOTS FIBROUS ROOTS

THE ROOTS

Root systems may be divided into two broad types: TAPROOTS and FIBROUS ROOTS:

TAPROOTS

Taproots are large single roots that have smaller roots extending from them. Taproots of some species store water and food. Species that have taproots include carrots, radishes and dandelions.

THE ROOTS

Root systems may be divided into two broad types: TAPROOTS and FIBROUS ROOTS:

Taproots are large single roots that have smaller roots extending from them. Taproots of some species store water and food. Species that have taproots include carrots, radishes and dandelions. FIBROUS ROOTS

THE ROOTS

they may act as anchorage, storage organs, an absorption

network for water and nutrients, and form a

symbiosis with root inhabiting fungi. They also affect their

environment by leaking carbohydrates and other

organic molecules, altering soil pH, filtering toxins and

accumulating rare elements, providing mechanical

structure in the soil and creating lines for water

movement (percolines).

Root hair

Root Cap

THE ROOTS

Roots may be classified into primary, secondary and tertiary roots:

THE ROOT

root-like structures:

Rhizome (indicated by arrow)

It looks superficially like roots, are actually developed from stems. They extend underground and develop shoots at the surface. Rhizomes connect apparently separate plants in a living network.

THE ROOT

root-like structures:

It arise from nodes near ground level on the stem, rhizome (as in the diagram above) or stolon: they are roots that do not arise from the principal root system.

Adventitious roots growing from rhizome

THE ROOT

CORMis a piece of swollen tissue: they may be stem-corms or root-corms depending on the tissue of origin. A corm survives between seasons in a dormant state.

STOLONis developed from a shoot. It is a specialised horizontal above-ground shoot, and a colonising organ that develops from an axillary bud, and near the base of the plant. Adventitious roots often develop from the stolon. E

root-like structures:

THE ROOT

TUBERSdiffers from a true bulb and a corm by not having a basal plate from which roots develop. It does not have a protective tunic covering. It may be formed from a stem or a root.

BULBA true bulb differs from a corm and a tuber in that it contains 5 major parts: the basal plate (bottom of bulb where roots develop), fleshy storage tissue, the tunic (skin-like covering protecting the fleshy tissue), the developing shoot, and lateral buds.

root-like structures:

THE FLOWER

  The anthers carry the pollen.  These are generally yellow in color.  Anthers are held up by a thread-like part called the filament.

The stigma is the sticky surface at the top of the pistil; it traps and holds the pollen.  The style is the tube-like structure that holds up the stigma.  The style leads down to the ovary that contains the ovules.

  The anthers carry the pollen.  These are generally yellow in color.  Anthers are held up by a thread-like part called the filament.

are the green petal-like parts at the base of the flower.  Sepals help protect the developing bud.

THE FLOWER

Reproduction through the Male & Female Organs of the flower, namely Pistil or Carpel and Stamen.

Reproduction begins during Pollination process.

THE FLOWERThe Pollination Process

The Pollination ProcessTHE FLOWER

THE FLOWERThe Pollination Process