INSTITUTO DE FISIOLOGIA VEGETAL
Unidad Ejecutora - UE
congresos y reuniones científicas
Role of Rht-1 altered function alleles in the antioxidant response during acclimation of wheat plants to phosphate deprivation
OLIFERUK, SONIA; MORICONI, JI; SIMONTACCHI, M; SANTA-MARÍA, GE
Congreso; VIII International Congress Society for Free radical Biology and Medicine South American Group; 2013
Phosphate (P) availability is a major constrain for crop yield. We explored the role of altered function Rht-B1b/Rht-D1b alleles of Rht-1 genes during plant responses to P-deprivation. Near Isogenic Lines of wheat (Triticum aestivum) bearing either Rht-B1a/Rht-D1a ?wild type? alleles (WT) or Rht-B1b/Rht-D1b alleles, which encode altered-function proteins which determine a double-dwarf (DD) phenotype were grown at 0.5 mM P or in the absence of P addition. After a 16 d P-deprivation period, DD plants showed a P-concentration higher, and a lower relative reduction of plant biomass accumulation, than WT plants. We hypothesized that these growth and developmental differential responses could be explained by differences in the antioxidant defense. Thus, the activity of ascorbate peroxidase (APX) and catalase (CAT) was determined. While APX activity increased after a 16 d P-deprivation period in both WT and DD plants. In turn, catalase activity (CAT) was lower in WT than in DD plants deprived of P. These results suggest that altered function alleles modulate the antioxidant response of wheat plants under conditions of low P-supply and that this modulation correlates with improved performance.