IIB   20738
INSTITUTO DE INVESTIGACIONES BIOLOGICAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Down-regulation of auxin signalling pathway enhances antioxidant metabolism as an adaptative response to salt stress in Arabidopsis
Autor/es:
IGLESIAS, MJ; TERRILE, MC; BARTOLI, CG; D' IPPOLITO, S; CASALONGUÉ, CA
Lugar:
La Plata
Reunión:
Congreso; XXVIII Reunión Argentina de Fisiología Vegetal; 2010
Institución organizadora:
Asociacion Argentina de Fisiologia Vegetal
Resumen:
The sessile
life style of plants makes them vulnerable to changing environmental
conditions. Salinization is a problem long being associated to agriculture. The
aim of this work was to study how auxin contributes to plant´s ability to grow
under changing conditions. The phytohormone auxin regulates gene expression
through direct physical interaction with TIR1/AFB receptor proteins. We have
previously reported that Arabidopsis double mutant for auxin receptors, tir1
afb2 is rather tolerant to abiotic stresses. In this work we analyzed the
effect of salinity by analyzing the auxin-inducible gene expression in the
BA3:GUS transgenic line. Salinity mediated by NaCl treatments significantly
inhibited the expression of BA3:GUS reporter in a dose-response manner. tir1
afb2 plants showed significantly reduced ROS accumulation as well as high
levels of ascorbic acid and antioxidant enzymatic activities. In addition,
auxin transport decreased under salt stress. Our evidences revealed that auxin
is fundamentally required to redistribute growth and development responses
meanwhile improve the adaptative response against changing salinity. The
cross-talk between auxin and redox-status is emerging as a new regulatory node
by which plants control acclimation responses to environmental stresses.
Partially supported by CONICET; UNMDP.