Net photosynthetic and transpiration rates in a chlorophyll-deficient isoline of soybean under well-watered and drought conditions

The gas exchange traits of wild type soybeans (cv. Clark) and a near-isogenic, chlorophyll-deficient line homozygous for the recessive allele y9 (y9y9) were compared under either well-watered or water-stress conditions. Mature leaves of y9 had a 65% lower chlorophyll content than wild type. However,...

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Autores principales: Luquez, Virginia Martha Cristina, Guiamet, Juan José, Montaldi, Edgardo Raúl
Formato: Articulo
Lenguaje:Español
Publicado: 1997
Materias:
Ciencias Agrarias
leaf sides
stomata density
stomatal conductance
water content
water use efficiency
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/123284
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-123284
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Español
topic Ciencias Agrarias
leaf sides
stomata density
stomatal conductance
water content
water use efficiency
spellingShingle Ciencias Agrarias
leaf sides
stomata density
stomatal conductance
water content
water use efficiency
Luquez, Virginia Martha Cristina
Guiamet, Juan José
Montaldi, Edgardo Raúl
Net photosynthetic and transpiration rates in a chlorophyll-deficient isoline of soybean under well-watered and drought conditions
topic_facet Ciencias Agrarias
leaf sides
stomata density
stomatal conductance
water content
water use efficiency
description The gas exchange traits of wild type soybeans (cv. Clark) and a near-isogenic, chlorophyll-deficient line homozygous for the recessive allele y9 (y9y9) were compared under either well-watered or water-stress conditions. Mature leaves of y9 had a 65% lower chlorophyll content than wild type. However, the net photosynthetic rate (PN) of y9 leaves was only 20% lower than in the wild type, irrespective of water availability. Transpiration rates (E) were significantly higher in leaves of y9, compared to the wild type, either under well-watered or stress conditions. The higher E of y9 correlated with increased stomatal conductance, particularly in the abaxial epidermis, where more than 70% of the stomata were located. The combination of lower PN and increased E resulted in a significant decrease of water use efficiency in y9, at both water availability levels. The relative water content decreased in stressed leaves, much more in y9 than in wild type leaves, probably because of the higher E of the mutant line.
format Articulo
Articulo
author Luquez, Virginia Martha Cristina
Guiamet, Juan José
Montaldi, Edgardo Raúl
author_facet Luquez, Virginia Martha Cristina
Guiamet, Juan José
Montaldi, Edgardo Raúl
author_sort Luquez, Virginia Martha Cristina
title Net photosynthetic and transpiration rates in a chlorophyll-deficient isoline of soybean under well-watered and drought conditions
title_short Net photosynthetic and transpiration rates in a chlorophyll-deficient isoline of soybean under well-watered and drought conditions
title_full Net photosynthetic and transpiration rates in a chlorophyll-deficient isoline of soybean under well-watered and drought conditions
title_fullStr Net photosynthetic and transpiration rates in a chlorophyll-deficient isoline of soybean under well-watered and drought conditions
title_full_unstemmed Net photosynthetic and transpiration rates in a chlorophyll-deficient isoline of soybean under well-watered and drought conditions
title_sort net photosynthetic and transpiration rates in a chlorophyll-deficient isoline of soybean under well-watered and drought conditions
publishDate 1997
url http://sedici.unlp.edu.ar/handle/10915/123284
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