IIB   20738
INSTITUTO DE INVESTIGACIONES BIOLOGICAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
AUXIN SIGNALING INTEGRATES GROWTH RESPONSES AND ADAPTATIVE MECHANISMS DURING SALT STRESS
Autor/es:
IGLESIAS, M. J.; TERRILE, C.; BARTOLI, C.; CASALONGUE, C.
Lugar:
San Miguel de Tucumán
Reunión:
Congreso; XLV Reunión Anual Sociedad Argentina de Investigación en Bioquímica y Biología Molecular; 2009
Institución organizadora:
SAIB
Resumen:
The plant hormone auxin is required for diverse aspects of plant
growth and development. In addition, there is an increasing body of
evidence on the participation of auxin signaling during the
adaptative response to adverse conditions. We have previously
reported that the Arabidopsis thaliana double mutant for auxin
receptors, TIR1 and AFB2, modifies root growth and is rather
tolerant to abiotic stress. The aim of this work was to study the
mechanism involved in the adaptative response of tir1/afb2 mutant
under salt and oxidative stress. We demonstrated that tir1/afb2
under salt and oxidative stress. We demonstrated that tir1/afb2
receptors, TIR1 and AFB2, modifies root growth and is rather
tolerant to abiotic stress. The aim of this work was to study the
mechanism involved in the adaptative response of tir1/afb2 mutant
under salt and oxidative stress. We demonstrated that tir1/afb2
under salt and oxidative stress. We demonstrated that tir1/afb2
Arabidopsis thaliana double mutant for auxin
receptors, TIR1 and AFB2, modifies root growth and is rather
tolerant to abiotic stress. The aim of this work was to study the
mechanism involved in the adaptative response of tir1/afb2 mutant
under salt and oxidative stress. We demonstrated that tir1/afb2
under salt and oxidative stress. We demonstrated that tir1/afb2
tir1/afb2 mutant
under salt and oxidative stress. We demonstrated that tir1/afb2tir1/afb2
mutant presents lower levels of superoxide ion and hydrogen
peroxide compared to wild-type. Furthermore, this double mutant
displays increased gene expression and activity of antioxidant
enzymes such as catalase, glutation-S-transferase and ascorbate
peroxidase. Under salinity, total and reduced ascorbate content in
tir1/afb2 mutant was 3 folds higher than in wild-type plants. These
data suggest that auxin could transduce and integrate
developmental and environmental signals by modulating
components of the antioxidant metabolism.
data suggest that auxin could transduce and integrate
developmental and environmental signals by modulating
components of the antioxidant metabolism.
mutant was 3 folds higher than in wild-type plants. These
data suggest that auxin could transduce and integrate
developmental and environmental signals by modulating
components of the antioxidant metabolism.
Partially supported by CONICET; UNMDP; ANPCyT.