Grapevines are frequently classified as isohydric or anisohydric in an attempt to portray their water relations strategy. However, despite the popularity of the iso/anisohydric classification, the underlying biology remains unclear. In this presentation, I will present a simple hydraulic model, field measurements, and the extensive literature on grapevine hydraulics to illustrate that the iso/anisohydric classification depends on the definition used and the environment in which it is grown, rather than describing an intrinsic property of the plant itself. I argue that abandoning the iso/anisohydric terminology and returning to a more fundamental hydraulic framework would provide a stronger foundation for cultivars comparisons.
Dr. Uri Hochberg
Making (Non)sense of Grapevine Cultivars Classification into Iso/anisohydric
Volcani Institute, Agricultural Research Organization, Israel