INVESTIGADORES
MELCHIORRE Mariana Noemi
artículos
Título:
GENES, CÉLULA, ORGANISMO y SENESCENCIA AUTOINDUCIDA
Autor/es:
TRIPPI, VS, LASCANO HR, MELCHIORRE M
Revista:
Academia Nacional de Ciencias
Editorial:
ACADEMIA NACIONAL DE CIENCIAS EXACTAS FÃ?SICAS Y NATURALES
Referencias:
Año: 2008 p. 1 - 40
ISSN:
0325-3406
Resumen:
This review suggests that plant senescence is a self-induced process. This proposition is base
on changing relations among cells and organs in a growing system, originated by growth
itself, and differentiation due to adaptation to internal and external environments conditions,
which are also changing conditions during development. This succession of events has
been called stress-functions or emerged features. Among them are mentioned: growth in
height restricting water supply to the most distal parts; the seed germination, modifying the
relations with oxygen during the change from anaerobic metabolisms to an aerobic one; leaf
growth and differentiation generating toxic hyperoxic conditions in autotrophic cells; the
source-sink relations, inducing senescence in source organs by deficiency; sugar accumulation
and growth regulators or hormones inducing oxidative process.
The reactive oxygen species (ROS), generated under different stress condition, should be
major modulators of growth and differentiation processes that became in senescence of both
autotrophic organs, which are more sensitive to oxidative process and heterotrophic ones,
which being more tolerant to oxidations assure specie perpetuation.