INBA   12521
INSTITUTO DE INVESTIGACIONES EN BIOCIENCIAS AGRICOLAS Y AMBIENTALES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
EFFECT OF PHYTOHORMONES ON OXIDATIVE STRESS IN SOYBEAN ROOTS SUBJECTED TO DROUGHT
Autor/es:
LOPEZ LECUBE, M; CAGGIANAO E; SANTA CRUZ, DM; NORIEGA G.O.; BALESTRASSE, K
Lugar:
a
Reunión:
Congreso; XLVII Reunión Anual Sociedad Argentina de Investigación en Bioquímica y Biología Molecular; 2011
Resumen:
The behaviour of catalase (CAT) and guayacol peroxidase (Gpox)was investigated in soybean plants pretreated with differentphytohormones such as indol acetic (AIA), jasmonic (JA) andsalicylic acids (SA) in soybean plants subjected to drought stress.Seeds were pretreated with 20 μM AIA, 20μM JA or 125 mM SAfor 48 h before 4 days germination in vermiculite. Plants were thensubjected to different polyethylene glycol (PEG) concentrationsranging from 0 to 8% (W/V). Our data showed that CAT as well asGpox activity were enhanced (up to 57% and 69%, respectively) inplants treated with different PEG concentrations. Surprisingly,plants subjected to phytohormones revealed a biphasic behavior.On one hand, under a mild drought stress (2% PEG) anenhancement in CAT activity was observed in the presence of thethree phytohormones (up to 100% in JA treated plants), but Gpoxshowed a different response. Activity diminution was assessed inthe presence of AIA, JA or SA (40%, 30% and 40%, respectively).On the other hand, under PEG concentrations (4% or 8%) asignificant diminution in both activities was detected. In order toget hints on these results, oxidative damage was detected in situ.Plants with diminished CAT and Gpox activities revealed a lessoxidative damage respect to those with elevated peroxidasesactivities, indicating the possible protective role of phytohormonesagainst drought