the auxin hormone is made in xylem tissues in a plant stem.
the auxin hormone is made in xylem tissues in a plant stem.
where is the auxin hormone made in a plant stem?
xylem tissues
an important principle of plant organization based upon auxin distribution is apical dominance, which means the auxin produced by the apical bud (or growing tip) diffuses (and is transported) downwards and inhibits the development of ulterior lateral bud growth, which would otherwise compete with the apical tip for light and nutrients. removing the apical tip and its suppressively acting auxin allows the lower dormant lateral buds to develop, and the buds between the leaf stalk and stem produce new shoots which compete to become the lead growth. the process is actually quite complex because auxin transported downwards from the lead shoot tip has to interact with several other plant hormones (such as strigolactones or cytokinins) in the process on various positions along the growth axis in plant body to achieve this phenomenon. this plant behavior is used in pruning by horticulturists.
auxin
section::::plant stem cell vs. callus.









































despite that callus exhibits a number of stem cell-like properties for a temporary period and that it has been cultured for useful plant compounds as an alternative source of plant stem cell, callus and plant stem cell are fundamentally different from each other. callus is similar to plant stem cell in its ability to differentiate, but the two are different in their origin. while plant stem cell exists in the meristematic tissues of plant, callus is obtained as a temporary response to cure wounds in somatic cell.
plant stem cell