INFIVE   05416
INSTITUTO DE FISIOLOGIA VEGETAL
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Participación del estrés oxidativo en la transición cloroplasto-cromoplasto
Autor/es:
STEELHEART, CHARLOTTE; ROTHAN, CHRISTOPHE; GERGOFF GROZEFF, GUSTAVO; ALEGRE, MATÍAS LEONEL; JUST, DANIELE; BARTOLI CARLOS GUILLERMO; BALDET, PIERRE; BRES, CECILE
Lugar:
Córdoba
Reunión:
Congreso; XVI Congreso Latinoamericano de Fisiología Vegetal; 2018
Institución organizadora:
Sociedad Argentina de Fisiología Vegetal
Resumen:
The transformation of chloroplasts into chromoplasts is acrucial part of the fruit development involving several processes. The disassembling of chloroplast structure and synthesis and accumulation of lycopene constitute dominating aspects of this ripening step.The increase of reactive oxygen species concentration during this transition has been observed but it may be a side-associated effect. The aim of this work is to demonstrateif oxidative stress plays an active role during chloroplast-chromoplast transition. Plants with reduced ascorbic acid (AA) content are prone to develop oxidative stress especially under changing environments.Tomato deficient plants in GDP-L-galactose phosphorylase, the first enzyme committed to the synthesis of AA were used. Wild type and AA deficient plants with green mature fruits were transferred to high light conditions to trigger oxidative stress. Hydrogen peroxide production and oxidative damage increased during transition from green to red stages, but unexpectedly was more pronounced in wild type fruits. Associated with this increment of oxidative stress an acceleration of ripening was observed suggesting the participation of reactive oxygen species in fruit development.