HomeInternational Rice Research Notesvol. 27 no. 1 (2002)

Maintaining predawn leaf water potential in two upland rice cultivars during drought stress and recovery

N. Trillana | R. Chaudhary | T. Inamura | T. Horie

Discipline: Agriculture



Differences in leaf water potential (LWP) among indica, japonica, and aus rice are possibly due to the magnitude or activity of the root system, and are assumed to result from a difference in root system extent (O'Toole and Cruz 1980). Measuring LWP at predawn, when the plant water potential more closely approaches equilibrium with the water potential of the soil around the roots, is likely to provide a measure of the effects of long-term water stress (Jones 1990). Root length density (RLD) is often used to characterize root system development of rice cultivars because its distribution in the root system is an important indicator of the potential of water uptake. This study carefully examined predawn LWP during a period of water exclusion and during recovery with root system development measured through relative RLD.