Photoacoustic characterization of plants adapted to different light intensity conditions / Caracterização fotoacustica de plantas crescidas sob diferentes condições de luminosidade

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

Ilumination level of plants during its growth is determinant for structure of leaves, specially refering to quantity and distribution of chloroplasts. The aim of this project is to use the photoacoustic technique to show physiological differences among plants adapted to different light intensity conditions. Tobacco plants were grown up under two distint irradiance levels. Congeneric plants, coming from different habitats (cerrado and florest), grown up under the same light level, were also studied. Since photoacoustic technique is sensitive to O2 produced by photosynthesis, photosynthetic response of plants from different light conditions were studied through PA measurements of photosynthetic induction. The energy storage was also determined in these plants. From the oxygen component of the photoacoustic signal it was possible to obtain action spectra for all the samples. Results showed that plants adapted to sunlight present lower efficiency in storing energy to photochemical reactions. The induction curves indicated these plants also take a longer time to reach a steady state of O2 production, after remaining a period in the dark. Photoinhibition experiments showed that plants grown up under lower light are more susceptible to excess of saturating light. It was also observed O2 uptake after photoinhibition in plants grown under full sunlight, which was associated to a competition between photosynthesis and photorespiration. The action spectra, obtained for the first time with photoacoustic measurements of O2 production, showed a good agreement with literature

ASSUNTO(S)

fotossintese espectroscopia fotoacustica oxygen evolution photosynthesis open photoacoustic cell photoacoustic spectroscopy evolução de oxigenio celula fotoacustica aberta

ACESSO AO ARTIGO

Documentos Relacionados