INVESTIGADORES
LASCANO Hernan Ramiro
artículos
Título:
- Plant Senescence: a self induced process.
Autor/es:
TRIPPI V. LASCANO HR, MELCHIORRE M.
Revista:
Current Topic in Plant Biology
Editorial:
Research Trends
Referencias:
Año: 2009 vol. 10 p. 1 - 14
ISSN:
0972-4575
Resumen:
ABSTRACT
This review suggests that plant senescence is a
self-induced process. This proposition is based 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 stressfunctions
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.
KEYWORDS: senescence, auto-organization, stresssenescence, auto-organization, stress