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Abstract
Delayed canopy senescence or ‘stay-green’ (SG) trait in maize (Zea mays L.) could improve drought tolerance. Two field trials comparing four to six maize hybrids with different senescence rate were carried out at Buenos Aires, Argentina, varying water availability during the reproductive period. Green leaf area at maturity was related to kernel weight (r2 = 0.94***) but its relationship with yield was weaker (r2 = 0.51–53*) and post-silking dry matter [ver mas...]
dc.contributor.authorAntonietta, Mariana
dc.contributor.authorMaydup, María Luján
dc.contributor.authorCano, María Gabriela
dc.contributor.authorFanello, Diego Darío
dc.contributor.authorAcciaresi, Horacio Abel
dc.contributor.authorGuiamet, Juan José
dc.date.accessioned2021-12-28T13:49:37Z
dc.date.available2021-12-28T13:49:37Z
dc.date.issued2021-05
dc.identifier.issn1445-4408
dc.identifier.issn1445-4416 (online)
dc.identifier.otherhttps://doi.org/10.1071/FP21138
dc.identifier.urihttp://hdl.handle.net/20.500.12123/11005
dc.identifier.urihttps://www.publish.csiro.au/FP/FP21138
dc.description.abstractDelayed canopy senescence or ‘stay-green’ (SG) trait in maize (Zea mays L.) could improve drought tolerance. Two field trials comparing four to six maize hybrids with different senescence rate were carried out at Buenos Aires, Argentina, varying water availability during the reproductive period. Green leaf area at maturity was related to kernel weight (r2 = 0.94***) but its relationship with yield was weaker (r2 = 0.51–53*) and post-silking dry matter remobilisation was negatively related with the SG trait (r2 = 0.84**). Two additional experiments were carried out in 63 L pots by withholding irrigation in half of the pots after silking. The SG hybrid achieved lower root biomass at silking, a shallower root distribution and larger root growth in the post-silking period. Under drought conditions, stomatal conductance was lower in the SG hybrid but photosynthetic electron transport rate was higher. Higher post-silking dry matter assimilation in the SG hybrid was compensated for by higher dry matter remobilisation in the non-SG. Higher kernel number per plant in the non-SG hybrid with no ability to compensate for by higher kernel weight in the SG, resulted in slightly higher yields in the non-SG under drought. A water conservation strategy associated with a shallower root system could be linked to the SG trait, promoting faster water depletion at upper soil levels and reduced stomatal conductance at the leaf level but with no conclusive yield advantage.eng
dc.formatapplication/pdfes_AR
dc.language.isoenges_AR
dc.publisherCSIRO Publishinges_AR
dc.rightsinfo:eu-repo/semantics/restrictedAccesses_AR
dc.sourceFunctional Plant Biology 48 (11) : 1124-1138. (2021)es_AR
dc.subjectMaízes_AR
dc.subjectZea mayses_AR
dc.subjectFotosíntesises_AR
dc.subjectPhotosynthesiseng
dc.subjectAbsorción de Aguaes_AR
dc.subjectWater Uptakeeng
dc.subjectAsimilaciónes_AR
dc.subjectAssimilationeng
dc.subjectConductancia Estomáticaes_AR
dc.subjectStomatal Conductanceeng
dc.subjectMaizeeng
dc.subject.otherBiomasa Radiculares_AR
dc.titleYield determinants, root distribution and soil water uptake in maize (Zea mays) hybrids differing in canopy senescence under post-silking droughtes_AR
dc.typeinfo:ar-repo/semantics/artículoes_AR
dc.typeinfo:eu-repo/semantics/articlees_AR
dc.typeinfo:eu-repo/semantics/publishedVersiones_AR
dc.description.origenEEA Pergaminoes_AR
dc.description.filFil: Antonietta, M. Universidad Nacional de La Plata – CONICET. Instituto de Fisiología Vegetal (INFIVE); Argentinaes_AR
dc.description.filFil: Maydup, M. L. Universidad Nacional de La Plata – CONICET. Instituto de Fisiología Vegetal (INFIVE); Argentinaes_AR
dc.description.filFil: Cano, M. G. Universidad Nacional de La Plata – CONICET. Instituto de Fisiología Vegetal (INFIVE); Argentinaes_AR
dc.description.filFil: Fanello, D. D. Universidad Nacional de La Plata – CONICET. Instituto de Fisiología Vegetal (INFIVE); Argentinaes_AR
dc.description.filFil: Acciaresi, Horacio. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Pergamino. Departamento de Malezas; Argentinaes_AR
dc.description.filFil: Acciaresi, Horacio. Universidad Nacional de La Plata. Facultad de Ciencias Agrarias y Forestales. Cátedra de Cerealicultura; Argentinaes_AR
dc.description.filFil: Guiamet, J. J. Universidad Nacional de La Plata – CONICET. Instituto de Fisiología Vegetal (INFIVE); Argentinaes_AR
dc.subtypecientifico


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