J. Phys. IV France 125 (2005) 745-748
Photo acoustic study of plants exposed to varying light intensity growth conditions: Spectral and morphological changesR.C. Mesquita1, P.R. Barja2, E.C. da Silva1 and A.M. Mansanares1
1 Instituto de Física "Gleb Wataghin", Universidade Estadual de Campinas, Unicamp, Cx. P. 6165, 13083-970, Campinas, São Paulo, Brazil
2 Instituto de Pesquisa & Desenvolvimento, Universidade Vale do Paraíba, Univap, 12244-000, São José dos Campos, São Paulo, Brazil
In this paper we describe results of photo acoustic (PA) measurements carried out on various plants exposed to varying light intensity conditions. Depending on the species and light intensity conditions, the PA absorption spectra show differences in peaks associated with pigments and the cuticle. These differences are related to the spatial distribution of the pigments that differs from plant to plant. We have also performed systematic study of oxygen evolution at different wavelengths. The obtained oxygen spectra are equivalent to the action spectra usually acquired by determining the CO2 uptake and energy storage. The intensities of oxygen spectra exhibit differences depending on distinct morphology of plant.
© EDP Sciences 2005