DYNAMICS OF WHOLE-PLANT WATER BALANCE AND LEAF GROWTH IN RESPONSE TO EVAPORATIVE DEMAND. II. EFFECT OF CHANGE IN WIND VELOCITY

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Dynamics of whole plant water balance and leaf expansive growth were analyzed in cucumber plants (Cucumis sativus L.) exposed to step change in wind velocity (U). The effect of step increase in U was caused by the hydropassive stomatal response, which appeared more active under the higher irradiance and the higher humidity conditions. Thereafter, the oscillations in whole-plant water balance and leaf growth were induced more actively under the higher irradiance in the lower humidity condition, where evaporative demand (ED_A) and consequently leaf transpiration increased rapidly with increase in U, and then by decrease in U, the oscillations were damped immediately. On the other hand, the oscillations were not induced under the higher humidity condition where ED_A and the transpiration were scarcely affected by change in U. Thus, the effect of change in U appeared in different patterns under different conditions of irradiance and humidity through the processes of water balance affected by change in ED_A.
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