The stay green mutations d1 and d2 increase water stress susceptibility in soybeans

The stay green mutant genotype d1d1d2d2 inhibits the breakdown of chloroplast components in senescing leaves of soybean (Glycine max L. Merr.). Together with G (a gene that preserves chlorophyll in the seed coat) they may extend photosynthetic activity in some conditions. While wild-type soybeans ma...

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Detalles Bibliográficos
Autores principales: Luquez, Virginia Martha Cristina, Guiamet, Juan José
Formato: Articulo
Lenguaje:Inglés
Publicado: 2002
Materias:
Ciencias Naturales
Drought
Senescence
Soybean
Stay green
Stress tolerance
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84443
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84443
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Drought
Senescence
Soybean
Stay green
Stress tolerance
spellingShingle Ciencias Naturales
Drought
Senescence
Soybean
Stay green
Stress tolerance
Luquez, Virginia Martha Cristina
Guiamet, Juan José
The stay green mutations d1 and d2 increase water stress susceptibility in soybeans
topic_facet Ciencias Naturales
Drought
Senescence
Soybean
Stay green
Stress tolerance
description The stay green mutant genotype d1d1d2d2 inhibits the breakdown of chloroplast components in senescing leaves of soybean (Glycine max L. Merr.). Together with G (a gene that preserves chlorophyll in the seed coat) they may extend photosynthetic activity in some conditions. While wild-type soybeans maintain high leaf water potentials right up to abscission, leaves of (GG)d1d1d2d2 dehydrate late in senescence, which suggests that water relations may be altered in the mutant. Three-week-old plants were subjected to a moderate water deficit (soil water potential=-0.7 MPa) for 7-10 d. Leaf water potential and relative water content decreased significantly more in response to water deficit in unifoliate leaves of GGd1d1d2d2 than in a near-isogenic wild-type line. Down-regulation of stomatal conductance in response to drought was similar in mutant and wild-type leaves. Likewise, exogenously applied ABA reduced stomatal conductance to a similar extent in the mutant and the wild type, and applied ABA failed to restore water deficit tolerance in GGd1d1d2d2. Experiments with explants lacking roots indicate that the accelerated dehydration of GGd1d1d2d2 is probably not due to alterations in the roots. In a comparison of near-isogenic lines carrying different combinations of d1, d2 and G, only d1d1d2d2 and GGd1d1d2d2 (i.e. the genotypes that cause the stay green phenotype) were more susceptible to water deficit than the wild type. These data suggest that pathways involved in chloroplast disassembly and in the regulation of stress responses may be intertwined and controlled by the same factors.
format Articulo
Articulo
author Luquez, Virginia Martha Cristina
Guiamet, Juan José
author_facet Luquez, Virginia Martha Cristina
Guiamet, Juan José
author_sort Luquez, Virginia Martha Cristina
title The stay green mutations d1 and d2 increase water stress susceptibility in soybeans
title_short The stay green mutations d1 and d2 increase water stress susceptibility in soybeans
title_full The stay green mutations d1 and d2 increase water stress susceptibility in soybeans
title_fullStr The stay green mutations d1 and d2 increase water stress susceptibility in soybeans
title_full_unstemmed The stay green mutations d1 and d2 increase water stress susceptibility in soybeans
title_sort stay green mutations d1 and d2 increase water stress susceptibility in soybeans
publishDate 2002
url http://sedici.unlp.edu.ar/handle/10915/84443
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