sentences:  The closing of the stomata is often mediated by chemical signals from the root (i.e., abscisic acid).In irrigated fields, the fact that plants close their stomata in response to drying of the roots can be exploited to ‘trick’ plants into using less water without reducing yields (see partial rootzone drying).The use of this technique was largely developed by Dr Peter Dry and colleagues in Australia (see nominative determinism).