Photosynthetica 2001, 39(2):233-237 | DOI: 10.1023/A:1013739428056
Carbon Dioxide Assimilation, Transpiration, and Leaf Conductance of Bean (Phaseolus Vulgaris L.) Under Blue and Red Radiation
- 1 Institute of Biology, The University of Białystok, Białystok, Poland
In bean (Phaseolus vulgaris L.) seedlings well supplied with water, rates of transpiration (E) and CO2 assimilation (PN) of the primary leaves were measured under blue (BR) or red (RR) irradiance of 150 µmol(photon) m-2 s-1. The leaf conductance to H2O vapour transfer (gH2O), as well as the intercellular concentrations of H2O vapour (ei) and of CO2 (Ci) were calculated. Under BR, gH2O was significantly greater, but PN was lower, and E similar as compared with corresponding values found under RR. The increase of stomata aperture under BR was evident although Ci was higher and ei was lower than under RR. Results agree with the suggestion that BR directly activates guard cell metabolism and in well watered plants determines mainly the stomata aperture.
Additional key words: intercellular CO2 and H2O vapour concentrations; leaf temperature; photosynthesis; stomata responses; water use efficiency
Published: June 1, 2001 Show citation
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