INVESTIGADORES
GOMEZ CASATI Diego Fabian
congresos y reuniones científicas
Título:
Mytochondrial dysfunction affects chloroplast functions
Autor/es:
BUSI, M. V.; GOMEZ LOBATO, M.E.; ARAYA, A.; DIEGO FABIAN GOMEZ CASATI
Lugar:
Potrero de los Funes
Reunión:
Congreso; XLVII Reunion SAIB; 2011
Institución organizadora:
SAIB
Resumen:
There are
several reports that address the relationship between mitochondrial
respiration, photosynthesis and chloroplast functions. That process provides
energy for biosynthesis, and its balance with photosynthesis determines the
rate of plant biomass accumulation. These interactions involve transcriptional
control, protein co-localization, distribution of biochemical pathways between
organelles, and the impact of substrate and product concentrations (metabolic
shuttles). Profound changes in gene expression of nuclear-encoded genes were
observed in Arabidopsis plants
exhibiting impaired mitochondrial function. This model, where the mitochondrial
flaw was induced by the expression of the unedited form of the ATP synthase
subunit 9 (u-ATP9), is useful to uncover
the interactions between organelles in plant cells. An interesting point of our
work is the fact that mitochondrial
dysfunction intransgenic plants can
affect photosynthesisby reducing the chlorophyll
levels. In fact, degradationof these pigments may be due
to the increase of Mg2+ dechelatase activity and ROS levels, inducing a dysfunctionof the light-harvesting (antenna) complex. qRT-PCR analysis of LCHI (At1g19150) and PSBQ2
(AT4g05180) mRNA levels shows an increase of about 5-fold in transgenic
lines compared to wild type plants, confirming the induction observed in microarray
experiments.