Abstract
AbstractThe transpiration responses of primary Avena leaves to blue‐light pulses were investigated. Only light with wave length shorter than 524 nm can produce the rapid transpiration response. The action spectrum has a maximum around 450 nm. The rapid transpiration response induced by blue‐light pulses successively disappeared in long‐term experiments if the plant was kept in darkness between the pulses. However, if visible light was given to the plant between the pulses, the rapid response was restored.The magnitude of the rapid transpiration response was investigated under different conditions of background illumination and blue‐light exposure. Saturation of the response was obtained with an irradiation level of 1.5–2 mW.cm−2 (5 min pulses) and with a pulse duration of 4 min (pulse irradiance 2 mW.cm−2). A pulse duration of 3 s was sufficient to produce a significant rapid response at an irradiation level of 2 mW.cm−2.
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