Heat stress in temperate and tropical maize hybrids: a novel approach for assessing sources of kernel loss in field conditions

Autores
Rattalino Edreira, Juan Ignacio; Otegui, Maria Elena
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Temperate and tropical maize differ in their tolerance to heat stress but the ecophysiological bases for genotypic differences are poorly Understood. Our objectives were (i) to assess the sources of kernel loss, and (ii) to identify the main differences in these traits among genotypes of contrasting genetic background. We used the classic relationships that associate final kernel number per plant (KNP) with plant (PGRCP) and ear (EGRCP) growth rates during the critical period for kernel set and Developed an alternative approach based on the combined analysis of these relationships for assessing sources of kernel loss in field conditions. We identified three sources of loss associated with (i) PGRCP reductions (KNP1), (ii)changes in biomass partitioning to the ear (KNP2), and (iii) constraints not directly related to assimilate allocation to the ear (KNP3). A partitioning index was also established (PI = EGRCP PGRCP −1). Field experiments included three contrasting maize hybrids (Te: temperate; Tr: tropical; TeTr: Te×Tr) grown under two temperature regimes (control and heated) during daytime hours. We tested heating (ca. 33–40 ◦C at ear level) along two 15-d periods (GS1: pre-anthesis; GS2: from silking onwards). Final KNP was severely reduced by heating, and this negative effect was larger (i) when it occurred during silking (−75% for GS2)than before anthesis (−52% for GS1), and (ii) for the Te hybrid (−77%) than the TeTr (−69%) and the Tr (−44%) hybrids. The contribution of each source of loss to the decrease in KNP was 47% for KNP1, 27% for KNP2, and 32% for KNP3. Variations in KNP2 were explained by changes in PI (r2 = 0.85, P < 0.001), and a critical PI value (0.25) for avoiding kernel loss due to KNP2 was established. A similar pattern among genotypes was found for the response of KNP to variations in both PGRCP and EGRCP, but the new approach indicated that enhanced tolerance of the tropical genotype was mainly associated with reduced KNP3.
Fil: Rattalino Edreira, Juan Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; Argentina;
Fil: Otegui, Maria Elena. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; Argentina;
Materia
Zea Mays (L)
Temperate And Tropical Hybrids
Heat Stress
Kernel Set
Kernel Numbers
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/998

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oai_identifier_str oai:ri.conicet.gov.ar:11336/998
network_acronym_str CONICETDig
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network_name_str CONICET Digital (CONICET)
spelling Heat stress in temperate and tropical maize hybrids: a novel approach for assessing sources of kernel loss in field conditionsRattalino Edreira, Juan IgnacioOtegui, Maria ElenaZea Mays (L)Temperate And Tropical HybridsHeat StressKernel SetKernel Numbershttps://purl.org/becyt/ford/4https://purl.org/becyt/ford/4.1Temperate and tropical maize differ in their tolerance to heat stress but the ecophysiological bases for genotypic differences are poorly Understood. Our objectives were (i) to assess the sources of kernel loss, and (ii) to identify the main differences in these traits among genotypes of contrasting genetic background. We used the classic relationships that associate final kernel number per plant (KNP) with plant (PGRCP) and ear (EGRCP) growth rates during the critical period for kernel set and Developed an alternative approach based on the combined analysis of these relationships for assessing sources of kernel loss in field conditions. We identified three sources of loss associated with (i) PGRCP reductions (KNP1), (ii)changes in biomass partitioning to the ear (KNP2), and (iii) constraints not directly related to assimilate allocation to the ear (KNP3). A partitioning index was also established (PI = EGRCP PGRCP −1). Field experiments included three contrasting maize hybrids (Te: temperate; Tr: tropical; TeTr: Te×Tr) grown under two temperature regimes (control and heated) during daytime hours. We tested heating (ca. 33–40 ◦C at ear level) along two 15-d periods (GS1: pre-anthesis; GS2: from silking onwards). Final KNP was severely reduced by heating, and this negative effect was larger (i) when it occurred during silking (−75% for GS2)than before anthesis (−52% for GS1), and (ii) for the Te hybrid (−77%) than the TeTr (−69%) and the Tr (−44%) hybrids. The contribution of each source of loss to the decrease in KNP was 47% for KNP1, 27% for KNP2, and 32% for KNP3. Variations in KNP2 were explained by changes in PI (r2 = 0.85, P < 0.001), and a critical PI value (0.25) for avoiding kernel loss due to KNP2 was established. A similar pattern among genotypes was found for the response of KNP to variations in both PGRCP and EGRCP, but the new approach indicated that enhanced tolerance of the tropical genotype was mainly associated with reduced KNP3.Fil: Rattalino Edreira, Juan Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; Argentina;Fil: Otegui, Maria Elena. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; Argentina;Elsevier Science Bv2013-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/998Rattalino Edreira, Juan Ignacio; Otegui, Maria Elena; Heat stress in temperate and tropical maize hybrids: a novel approach for assessing sources of kernel loss in field conditions; Elsevier Science Bv; Field Crops Research; 142; 1-2013; 58-670378-4290enginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.fcr.2012.11.009info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T14:22:52Zoai:ri.conicet.gov.ar:11336/998instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-15 14:22:52.345CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Heat stress in temperate and tropical maize hybrids: a novel approach for assessing sources of kernel loss in field conditions
title Heat stress in temperate and tropical maize hybrids: a novel approach for assessing sources of kernel loss in field conditions
spellingShingle Heat stress in temperate and tropical maize hybrids: a novel approach for assessing sources of kernel loss in field conditions
Rattalino Edreira, Juan Ignacio
Zea Mays (L)
Temperate And Tropical Hybrids
Heat Stress
Kernel Set
Kernel Numbers
title_short Heat stress in temperate and tropical maize hybrids: a novel approach for assessing sources of kernel loss in field conditions
title_full Heat stress in temperate and tropical maize hybrids: a novel approach for assessing sources of kernel loss in field conditions
title_fullStr Heat stress in temperate and tropical maize hybrids: a novel approach for assessing sources of kernel loss in field conditions
title_full_unstemmed Heat stress in temperate and tropical maize hybrids: a novel approach for assessing sources of kernel loss in field conditions
title_sort Heat stress in temperate and tropical maize hybrids: a novel approach for assessing sources of kernel loss in field conditions
dc.creator.none.fl_str_mv Rattalino Edreira, Juan Ignacio
Otegui, Maria Elena
author Rattalino Edreira, Juan Ignacio
author_facet Rattalino Edreira, Juan Ignacio
Otegui, Maria Elena
author_role author
author2 Otegui, Maria Elena
author2_role author
dc.subject.none.fl_str_mv Zea Mays (L)
Temperate And Tropical Hybrids
Heat Stress
Kernel Set
Kernel Numbers
topic Zea Mays (L)
Temperate And Tropical Hybrids
Heat Stress
Kernel Set
Kernel Numbers
purl_subject.fl_str_mv https://purl.org/becyt/ford/4
https://purl.org/becyt/ford/4.1
dc.description.none.fl_txt_mv Temperate and tropical maize differ in their tolerance to heat stress but the ecophysiological bases for genotypic differences are poorly Understood. Our objectives were (i) to assess the sources of kernel loss, and (ii) to identify the main differences in these traits among genotypes of contrasting genetic background. We used the classic relationships that associate final kernel number per plant (KNP) with plant (PGRCP) and ear (EGRCP) growth rates during the critical period for kernel set and Developed an alternative approach based on the combined analysis of these relationships for assessing sources of kernel loss in field conditions. We identified three sources of loss associated with (i) PGRCP reductions (KNP1), (ii)changes in biomass partitioning to the ear (KNP2), and (iii) constraints not directly related to assimilate allocation to the ear (KNP3). A partitioning index was also established (PI = EGRCP PGRCP −1). Field experiments included three contrasting maize hybrids (Te: temperate; Tr: tropical; TeTr: Te×Tr) grown under two temperature regimes (control and heated) during daytime hours. We tested heating (ca. 33–40 ◦C at ear level) along two 15-d periods (GS1: pre-anthesis; GS2: from silking onwards). Final KNP was severely reduced by heating, and this negative effect was larger (i) when it occurred during silking (−75% for GS2)than before anthesis (−52% for GS1), and (ii) for the Te hybrid (−77%) than the TeTr (−69%) and the Tr (−44%) hybrids. The contribution of each source of loss to the decrease in KNP was 47% for KNP1, 27% for KNP2, and 32% for KNP3. Variations in KNP2 were explained by changes in PI (r2 = 0.85, P < 0.001), and a critical PI value (0.25) for avoiding kernel loss due to KNP2 was established. A similar pattern among genotypes was found for the response of KNP to variations in both PGRCP and EGRCP, but the new approach indicated that enhanced tolerance of the tropical genotype was mainly associated with reduced KNP3.
Fil: Rattalino Edreira, Juan Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; Argentina;
Fil: Otegui, Maria Elena. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; Argentina;
description Temperate and tropical maize differ in their tolerance to heat stress but the ecophysiological bases for genotypic differences are poorly Understood. Our objectives were (i) to assess the sources of kernel loss, and (ii) to identify the main differences in these traits among genotypes of contrasting genetic background. We used the classic relationships that associate final kernel number per plant (KNP) with plant (PGRCP) and ear (EGRCP) growth rates during the critical period for kernel set and Developed an alternative approach based on the combined analysis of these relationships for assessing sources of kernel loss in field conditions. We identified three sources of loss associated with (i) PGRCP reductions (KNP1), (ii)changes in biomass partitioning to the ear (KNP2), and (iii) constraints not directly related to assimilate allocation to the ear (KNP3). A partitioning index was also established (PI = EGRCP PGRCP −1). Field experiments included three contrasting maize hybrids (Te: temperate; Tr: tropical; TeTr: Te×Tr) grown under two temperature regimes (control and heated) during daytime hours. We tested heating (ca. 33–40 ◦C at ear level) along two 15-d periods (GS1: pre-anthesis; GS2: from silking onwards). Final KNP was severely reduced by heating, and this negative effect was larger (i) when it occurred during silking (−75% for GS2)than before anthesis (−52% for GS1), and (ii) for the Te hybrid (−77%) than the TeTr (−69%) and the Tr (−44%) hybrids. The contribution of each source of loss to the decrease in KNP was 47% for KNP1, 27% for KNP2, and 32% for KNP3. Variations in KNP2 were explained by changes in PI (r2 = 0.85, P < 0.001), and a critical PI value (0.25) for avoiding kernel loss due to KNP2 was established. A similar pattern among genotypes was found for the response of KNP to variations in both PGRCP and EGRCP, but the new approach indicated that enhanced tolerance of the tropical genotype was mainly associated with reduced KNP3.
publishDate 2013
dc.date.none.fl_str_mv 2013-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/998
Rattalino Edreira, Juan Ignacio; Otegui, Maria Elena; Heat stress in temperate and tropical maize hybrids: a novel approach for assessing sources of kernel loss in field conditions; Elsevier Science Bv; Field Crops Research; 142; 1-2013; 58-67
0378-4290
url http://hdl.handle.net/11336/998
identifier_str_mv Rattalino Edreira, Juan Ignacio; Otegui, Maria Elena; Heat stress in temperate and tropical maize hybrids: a novel approach for assessing sources of kernel loss in field conditions; Elsevier Science Bv; Field Crops Research; 142; 1-2013; 58-67
0378-4290
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1016/j.fcr.2012.11.009
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier Science Bv
publisher.none.fl_str_mv Elsevier Science Bv
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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