INVESTIGADORES
LAGORIO MarÍa Gabriela
congresos y reuniones científicas
Título:
Spectroscopic study on forage species irrigated with arsenic solutions and exposed to different resource levels
Autor/es:
GABRIELA B. CORDON; ANALIA IRIEL; ALICIA FERNÁNDEZ CIRELLI; JOSÉ PARUELO; MARÍA GABRIELA LAGORIO
Lugar:
Córdoba
Reunión:
Congreso; 16th International Congress on Photobiology; 2014
Institución organizadora:
International Union on Photobiology
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, FPSII, 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.
Acknowledgments: Financial support from UBA
(UBACyT 20020100100814) and ANPCyT (PICT 2012-2357). GC, AI, AFC and JMP are
members of the Carrera de Investigador científico y tecnológico del CONICET.
[1] A. Iriel, J.
Mendes Novo, G. B. Cordon and M. G. Lagorio, Photoch. Photobiol. 2014, 90,
107.