APGC特集号論文
A Method for in Situ Evaluation of Transpirational Water Loss from Crop Field by Applying Abscisic Acid to Plants
2005 年 60 巻 6 号 p. 1117-1120
詳細
2005 年 60 巻 6 号 p. 1117-1120
A new method for evaluating rate of tanspirational water loss from the crop field was proposed and examined on the basis of rise in leaf temperature caused by application of abscisic acid (ABA) to plants. ABA is a plant honnone which induces stomatal closure and depression of transpiration without any change in turgidity and spectrum characteristics of leaves. By measuring the rise in leaf temperature after ABA application, transpiration rate in the crop field can be estimated by the following equation:
EL=CpρGEΔTL/λn
where ΔTL is the rise in leaf temperature after ABA application, n is the coefficient of transpiration depression by ABA application, GE is the conductance for sensible heat transfer, Cpρ is the volumetric heat capacity of air and λ is the latent heat for vaporization. ΔTL and GE can be measured by the micrometeorological Observation using a thermography and anemometers, respectively, and n can be evaluated by using the ABA treated plants. Validity of this evaluation method was demonstrated in the preliminary experiments.
