FBS 10 LEC 4

shoot system

Nodes (module)
Internodes (module) 

nodes

points at which

leaves attach

Internodes

stem

length between

nodes-

Apical/terminal bud
Axillary bud

Apical/terminal bud

located near the

shoot tip,

lengthens a shoot

Axillary bud

structure that can

form a lateral

shoot, or branch

apical dominance.

The presence of a terminal

(apical) bud is partly

responsible for inhibiting

the growth of axillary

buds, a phenomenon

called

apical dominance

Leaf primordia

are crowded

close together because their

internodes are very short.

intercalary meristems

Protoderm

The

outermost layer of cells in

the shoot tip forms the

epidermis;

Epidermal cells

Guard cells

Trichomes or hairs

Cuticle

Protoderm  Epidermis,

which is made of:

Ground meristem

These cells slowly lose their ability

to divide, and they differentiate

mostly into parenchyma cells;

flank meristem

forms the

cortex (the cylinder of cells just

inside the epidermis),

rib meristem

forms the

pith (the core of cells in the center

of the stem)

Ground meristem

cortex & pith

The pith region of the

stem in some plants

may become hollow by

the breakdown of the

centrally located

parenchyma cells.

Procambium

produces the primary

vascular tissues

(primary xylem and

primary phloem);

scattered

In the stems of

monocots, the

vascular bundles tends _______throughout the stem

instead of being in a

ring.