Lateral Roots originate in the Stele or the Endodermis. They grow
through the Cortex and Epidermis.
Early
Stages in Lateral Root Initiation
Later
Stage in Lateral Root Production - only the Epidermis remains between it and the
Rhizosphere.
Lateral Root showing the Vascular Connection between it and the parent Stele.
Tap root system of Zamia
Lateral roots are produced in a definite pattern. The youngest
roots are close (proximal) to the apex. The pattern of lateral root production is readily
observed with tap root systems. The tap root can also be called the primary root while its
branches are called secondary or lateral roots.
Plant with a Fibrous Root System.
The
origin of lateral roots can be unraveled for species that have fibrous root systems. A
clear pattern emerges with careful study.
Note
the lateral roots which have emerged from an aerial root of a plam.
Careful
study will reveal the patern of root production.
Why do you think they are so stubby?
Locate
the lateral roots in this picture of ie ie roots. What is their principal
function in this case?