Abstract
Maintaining plant water status above a critical threshold is a crucial necessity for plant growth and reproduction. However, the factors that determine this threshold level and the ways in which it is regulated vary greatly between species and even across the life cycle of individual species. Isohydric waterbalance behavior involves the maintenance of a constant leaf water potential at midday, which is similar in well-irrigated plants and under drought conditions. In contrast, plants exhibiting anisohydric behavior have markedly decreased water potentials following the evaporative demand experienced during the day. This permits lower leaf water potentials in the presence of drought stress (Tardieu and Simonneau 1998). It has been suggested that the core physiological parameter thresh
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