INVESTIGADORES
BARTOLI Carlos Guillermo
congresos y reuniones científicas
Título:
Hormonal control on ascorbic acid synthesis and its interaction with respiration
Autor/es:
MAZORRA, LUIS MIGUEL; SENN, MARÍA EUGENIA; GERGOFF GROZEFF, GUSTAVO; FANELLO, DIEGO DARÍO; CARRIÓN, CRISTIAN; NÚÑEZ MIRIAM; BISHOP, GERARD; BARTOLI, CARLOS GUILLERMO
Lugar:
Rosario
Reunión:
Congreso; 8th International Conference for Plant Mitochondria Biology; 2013
Resumen:
Ascorbic acid (AA)
regulates photosynthesis, stomata closure, cell growth and plays an important
role in the detoxification of reactive oxygen species. The
last step of AA biosynthesis in plants is catalysed by the mitochondrial flavoenzyme L-galactono-1,4-lactone
dehydrogenase (L-GalLDH). Brassinosteroids
(BR) are plant steroid hormones that control cell elongation, growth and
photosynthesis but their participation in mitochondria activity remains to be
studied. Similarly, the hormonal control on AA levels is still largely unknown.
The aim of this work is to study the participation of hormones in L-GalLDH
activity and its interaction with respiration. The experiments were carried out
using BR deficient (dx)
or BR over-accumulating tomato plants, in combination with exogenous
BR application. In addition, since dx leaves
presented increased ethylene production the application of 1-methylcyclopropene
was used to inhibit ethylene sensitivity.
The results
presented here show antagonistic effects of BR and ethylene on leaf AA
synthesis, displayed by isolated mitochondria or whole leaf tissues. The BR/ethylene
level ratio regulating plant mitochondria metabolism will be discussed.