Abstract
Leaf ψs (osmotic potential) of two Sorghum bicolor (L.) Moench cultivars M35 and NK300 given an irrigation treatment decreased with increasing plant age. Following 3 wk without irrigation, leaf ψs of plants of both cultivars was lower than that in irrigated controls. Following 9 wk without irrigation, leaf ψs of M35 plants was still significantly lower than that in irrigated controls; but in NK300 the difference in leaf ψs between irrigated and non-irrigated plants was no longer significant due to an ageing effect changing leaf ψs less in non-irrigated than in irrigated plants. Evidence indicated that leaf ψs decreased due to osmoregulation, a drought avoidance mechanism, resulting in formation of more osmotically active cellular solutes. Greater leaf senescence of non-irrigated plants is a second drought avoidance mechanism used by sorghum to decrease transpiration requirements. Leaf diffusive resistance measurements indicated open stomata in both irrigated and non-irrigated plants so that under the imposed water stress conditions stomatal closure was not affecting the transpiration requirement.
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