Auxin produces a number of other effects in addition to stimulating cell
elongation and causing stems and roots to lengthen.
o For example: it induces cell division in the vascular cambium, thus
promoting growth in stem diameter.
Also, auxin produced by developing seeds promotes the growth of fruit.
Cytokinins stimulate cell division
Cytokinins are a group of closely related hormones that promote
cytokinesis, or cell division. o A number of cytokinins have been
extracted from plants; the most common is zeatin.
o Natural cytokinins are produced in actively growing tissues, particularly
in roots, embryos and fruits.
o Cytokinins made in the roots reach target tissues in stems by moving
upward in xylem sap.