This is just like phototropism, in that auxin in the root inhibits growth and auxin in the stem promotes growth.

Auxins are chemicals that control the growth of plants by promoting cell division and causing elongation in plant cells (the cells get longer).

Plants rely on abscisic acid (ABA), a crucial plant ... the researchers' restoration of normal root growth in these mutants ...

Knowing how pathogens affect root growth and overall biomass ... The most common auxin in nature is called Indole-3 acetic acid – IAA for short. In plants, IAA affects cells' length, plants ...