INVESTIGADORES
AGUIRREZABAL Luis Adolfo Nazareno
artículos
Título:
Genetic variability for leaf growth rate and duration under water deficit in sunflower. Analysis of responses at cell, organ, and plant level.
Autor/es:
PEREYRA IRUJO, G.; VELÁSQUEZ, L.; LECHNER, L.; LUIS ADOLFO NAZARENO AGUIRREZABAL
Revista:
Journal of Experimental Botany
Editorial:
Oxford Journals
Referencias:
Año: 2008 vol. 59 p. 2221 - 2232
ISSN:
0022-0957
Resumen:
Abstract
Plants under water deficit reduce leaf growth, thereby
reducing transpiration rate at the expense of reduced
photosynthesis. The objective of this work was to
analyse the response of leaf growth to water deficit in
several sunflower genotypes in order to identify and
quantitatively describe sources of genetic variability
for this trait that could be used to develop crop
varieties adapted to specific scenarios. The genetic
variability of the response of leaf growth to water
deficit was assessed among 18 sunflower (Helianthus
annuus L.) inbred lines representing a broad range of
genetic diversity. Plants were subjected to long-term,
constant-level, water-deficit treatments, and the response
to water deficit quantified by means of growth
models at cell-, leaf-, and plant-scale. Significant
variation among lines was found for the response of
leaf expansion rate and of leaf growth duration, with an
equal contribution of these responses to the variability
in the reduction of leaf area. Increased leaf growth
duration under water deficit is usually suggested to be
caused by changes in the activity of cell-wall enzymes,
but the present results suggest that the duration of
epidermal cell division plays a key role in this response.
Intrinsic genotypic responses of rate and
duration at a cellular scale were linked to genotypic
differences in whole-plant leaf area profile to water
deficit. The results suggest that rate and duration
responses are the result of different physiological
mechanisms, and therefore capable of being combined
to increase the variability in leaf area response to
water deficit.
genetic diversity. Plants were subjected to long-term,
constant-level, water-deficit treatments, and the response
to water deficit quantified by means of growth
models at cell-, leaf-, and plant-scale. Significant
variation among lines was found for the response of
leaf expansion rate and of leaf growth duration, with an
equal contribution of these responses to the variability
in the reduction of leaf area. Increased leaf growth
duration under water deficit is usually suggested to be
caused by changes in the activity of cell-wall enzymes,
but the present results suggest that the duration of
epidermal cell division plays a key role in this response.
Intrinsic genotypic responses of rate and
duration at a cellular scale were linked to genotypic
differences in whole-plant leaf area profile to water
deficit. The results suggest that rate and duration
responses are the result of different physiological
mechanisms, and therefore capable of being combined
to increase the variability in leaf area response to
water deficit.
annuus L.) inbred lines representing a broad range of
genetic diversity. Plants were subjected to long-term,
constant-level, water-deficit treatments, and the response
to water deficit quantified by means of growth
models at cell-, leaf-, and plant-scale. Significant
variation among lines was found for the response of
leaf expansion rate and of leaf growth duration, with an
equal contribution of these responses to the variability
in the reduction of leaf area. Increased leaf growth
duration under water deficit is usually suggested to be
caused by changes in the activity of cell-wall enzymes,
but the present results suggest that the duration of
epidermal cell division plays a key role in this response.
Intrinsic genotypic responses of rate and
duration at a cellular scale were linked to genotypic
differences in whole-plant leaf area profile to water
deficit. The results suggest that rate and duration
responses are the result of different physiological
mechanisms, and therefore capable of being combined
to increase the variability in leaf area response to
water deficit.
genetic diversity. Plants were subjected to long-term,
constant-level, water-deficit treatments, and the response
to water deficit quantified by means of growth
models at cell-, leaf-, and plant-scale. Significant
variation among lines was found for the response of
leaf expansion rate and of leaf growth duration, with an
equal contribution of these responses to the variability
in the reduction of leaf area. Increased leaf growth
duration under water deficit is usually suggested to be
caused by changes in the activity of cell-wall enzymes,
but the present results suggest that the duration of
epidermal cell division plays a key role in this response.
Intrinsic genotypic responses of rate and
duration at a cellular scale were linked to genotypic
differences in whole-plant leaf area profile to water
deficit. The results suggest that rate and duration
responses are the result of different physiological
mechanisms, and therefore capable of being combined
to increase the variability in leaf area response to
water deficit.
Helianthus
annuus L.) inbred lines representing a broad range of
genetic diversity. Plants were subjected to long-term,
constant-level, water-deficit treatments, and the response
to water deficit quantified by means of growth
models at cell-, leaf-, and plant-scale. Significant
variation among lines was found for the response of
leaf expansion rate and of leaf growth duration, with an
equal contribution of these responses to the variability
in the reduction of leaf area. Increased leaf growth
duration under water deficit is usually suggested to be
caused by changes in the activity of cell-wall enzymes,
but the present results suggest that the duration of
epidermal cell division plays a key role in this response.
Intrinsic genotypic responses of rate and
duration at a cellular scale were linked to genotypic
differences in whole-plant leaf area profile to water
deficit. The results suggest that rate and duration
responses are the result of different physiological
mechanisms, and therefore capable of being combined
to increase the variability in leaf area response to
water deficit.
genetic diversity. Plants were subjected to long-term,
constant-level, water-deficit treatments, and the response
to water deficit quantified by means of growth
models at cell-, leaf-, and plant-scale. Significant
variation among lines was found for the response of
leaf expansion rate and of leaf growth duration, with an
equal contribution of these responses to the variability
in the reduction of leaf area. Increased leaf growth
duration under water deficit is usually suggested to be
caused by changes in the activity of cell-wall enzymes,
but the present results suggest that the duration of
epidermal cell division plays a key role in this response.
Intrinsic genotypic responses of rate and
duration at a cellular scale were linked to genotypic
differences in whole-plant leaf area profile to water
deficit. The results suggest that rate and duration
responses are the result of different physiological
mechanisms, and therefore capable of being combined
to increase the variability in leaf area response to
water deficit.
L.) inbred lines representing a broad range of
genetic diversity. Plants were subjected to long-term,
constant-level, water-deficit treatments, and the response
to water deficit quantified by means of growth
models at cell-, leaf-, and plant-scale. Significant
variation among lines was found for the response of
leaf expansion rate and of leaf growth duration, with an
equal contribution of these responses to the variability
in the reduction of leaf area. Increased leaf growth
duration under water deficit is usually suggested to be
caused by changes in the activity of cell-wall enzymes,
but the present results suggest that the duration of
epidermal cell division plays a key role in this response.
Intrinsic genotypic responses of rate and
duration at a cellular scale were linked to genotypic
differences in whole-plant leaf area profile to water
deficit. The results suggest that rate and duration
responses are the result of different physiological
mechanisms, and therefore capable of being combined
to increase the variability in leaf area response to
water deficit.