Stress-induced abscisic acid transients and stimulus-responsecoupling

Some cellular and molecular properties of abscisic acid: its particular involvement in growing plant roots

“…Desiccation may influence growth via effects on several parameters, such as hydraulic conductivity of tissues [131], osmotic characteristics of the cell [130,132,133] and rheological properties of the cell wall [134]. Although it is well established that ABA is synthesized in roots [37,88,109], it was not until comparatively recently that an essential role was postulated for root-sourced ABA in the control (as a signal) of desiccated plants [30,130,135]. It has been suggested that ABA produced in large quantities by dehydrated roots and subsequently transported to the shoots provides a sensitive indication of the degree of soil drying [136].…”