Leaf water potential and stomatal conductance of rubber (Hevea brasiliensis) as influenced by soil moisture and leaf age

Abstract

Stomatal conductance and transpiration and leaf water potential of rubber (Hevea brasiliensis), clone PB 86, subjected to water stress were measured with a steady-state porometer and a pressure bomb, respectively. In well watered plants young leaves showed a higher stomatal conductance than mature leaves. In water stressed plants young leaves always exhibited a lower stomatal conductance than mature leaves. Increase in soil dehydration reduced the leaf water potential, stomatal conductance and the rate of transpiration.