INPA   24560
UNIDAD EJECUTORA DE INVESTIGACIONES EN PRODUCCION ANIMAL
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Spectroscopic study on forage species irrigated with arsenic solutions and exposed to different resource levels
Autor/es:
GABRIELA CORDON; ANALIA IRIEL; ALICIA FERNÁNDEZ CIRELLI; JOSE M. PARUELO; M. GABRIELA LAGORIO
Reunión:
Congreso; 16th International Congress on Photobiology; 2014
Resumen:
The presence of arsenic in groundwater is a major problem in several areas in Latin America. In the present work, we explore non-destructive approaches to monitor the effects of arsenic on forage plants (Cichorium intubus a herbaceous Asteraceae and Avena sativa a C3 Poaceae). We evaluate the effect at different levels of water and radiation on them. Plants were grown in a greenhouse, watered daily with arsenic solutions and exposed to different water and/or light conditions during four months using a three factors (arsenic, water, radiation) and two levels of resource (23) factorial design Kinetic parameters from chlorophyll fluorescence (registered with a pulse modulated fluorometer) and reflectance spectra (recorded with a spectroradiometer) were obtained in vivo for completely developed leaves. Additionally, initial clorophyll fluorescence under low photon flux was measured in detached leaves (with a standard steady-state fluorometer). All data were obtained in triplicates. The maximum efficiency of photosynthesis, Fv/Fm, the quantum efficiency of PSII, PSII, the parameters of photochemical quenching, qP, the non-photochemical quenching parameters, qNP, QNP, the photochemical reflectance index, PRI (a measure of the radiation use efficiency) the normalized difference vegetation index, NDVI (a measure of photosynthetic active radiation absorption), the fluorescence ratio Fred/Ffar-red and the first derivate of reflectance spectra were collected weekly during a month (july, 2013). The first derivative of reflectance spectra in the green region was the only parameter displaying significative differences for all the studied cases.