INVESTIGADORES
TRAVAGLIA Claudia Noemi
artículos
Título:
Exogenous ABA increases yield in field-grown wheat with a moderate water restriction
Autor/es:
CLAUDIA TRAVAGLIA, HERMINDA REINOSO, ANA COHEN, CELINA LUNA, EZEQUIEL TOMMASINO, CARLOS CASTILLO, RUBÉN BOTTINI.
Revista:
JOURNAL OF PLANT GROWTH REGULATION
Editorial:
SPRINGER
Referencias:
Año: 2010 vol. 29 p. 366 - 374
ISSN:
0721-7595
Resumen:
Water stress is one of the most important
environmental factors that regulate a plants growth and
development. In agronomic practice the effects of water
stress are translated into low yield and/or reduced quality.
Abscisic acid (ABA) sprays (1 mM) were applied to wheat
plants at different phenological stages and the effects on
several physiological variables and on yield were evaluated
under field conditions at different water regimes. Studies
were conducted in the field across three consecutive winter
spring seasons. ABA treatments were applied at the
beginning of shoot enlargement and repeated at anthesis.
Exogenous ABA increased shoot dry weight and maintained
a high concentration of photosynthetic pigments for
a longer period of time during grain growth and maturation.
Although ABA applications increased stomatal closure
immediately after its application, the longer-term
effect was to allow for a greater ostiolar opening of the
stomatal pore which resulted in increased conductance of
gases and water vapor. ABA also improved the transport of
photoassimilates from the leaves and stem to the developing
grains, that is, it effectively increased the sink
strength of the grains. This correlated with a yield increase
without significantly changing the protein quality in the
grains. Thus, elevated ABA levels from exogenous application
or genetic selection could help improve agricultural
production of grains in arid areas where irrigation is not
possible.
beginning of shoot enlargement and repeated at anthesis.
Exogenous ABA increased shoot dry weight and maintained
a high concentration of photosynthetic pigments for
a longer period of time during grain growth and maturation.
Although ABA applications increased stomatal closure
immediately after its application, the longer-term
effect was to allow for a greater ostiolar opening of the
stomatal pore which resulted in increased conductance of
gases and water vapor. ABA also improved the transport of
photoassimilates from the leaves and stem to the developing
grains, that is, it effectively increased the sink
strength of the grains. This correlated with a yield increase
without significantly changing the protein quality in the
grains. Thus, elevated ABA levels from exogenous application
or genetic selection could help improve agricultural
production of grains in arid areas where irrigation is not
possible.
beginning of shoot enlargement and repeated at anthesis.
Exogenous ABA increased shoot dry weight and maintained
a high concentration of photosynthetic pigments for
a longer period of time during grain growth and maturation.
Although ABA applications increased stomatal closure
immediately after its application, the longer-term
effect was to allow for a greater ostiolar opening of the
stomatal pore which resulted in increased conductance of
gases and water vapor. ABA also improved the transport of
photoassimilates from the leaves and stem to the developing
grains, that is, it effectively increased the sink
strength of the grains. This correlated with a yield increase
without significantly changing the protein quality in the
grains. Thus, elevated ABA levels from exogenous application
or genetic selection could help improve agricultural
production of grains in arid areas where irrigation is not
possible.
. ABA treatments were applied at the
beginning of shoot enlargement and repeated at anthesis.
Exogenous ABA increased shoot dry weight and maintained
a high concentration of photosynthetic pigments for
a longer period of time during grain growth and maturation.
Although ABA applications increased stomatal closure
immediately after its application, the longer-term
effect was to allow for a greater ostiolar opening of the
stomatal pore which resulted in increased conductance of
gases and water vapor. ABA also improved the transport of
photoassimilates from the leaves and stem to the developing
grains, that is, it effectively increased the sink
strength of the grains. This correlated with a yield increase
without significantly changing the protein quality in the
grains. Thus, elevated ABA levels from exogenous application
or genetic selection could help improve agricultural
production of grains in arid areas where irrigation is not
possible.