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Breeding has developed better yielding maize hybrids for low N environments, which also have delayed leaf senescence (‘stay green’ trait, SG). Here, we studied whether the SG trait can further improve yield of modern hybrids under N-limiting conditions. In two field experiments, four maize hybrids with different senescence behaviour were grown under three N fertilization levels, from 0 to 200 kg N ha 1 (N0, N100 and N200). After silking, hybrids differed
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dc.contributor.author | Antonietta, Mariana | |
dc.contributor.author | Acciaresi, Horacio Abel | |
dc.contributor.author | Guiamet, Juan José | |
dc.coverage.spatial | Argentina (nation) | |
dc.date.accessioned | 2017-08-07T12:02:25Z | |
dc.date.available | 2017-08-07T12:02:25Z | |
dc.date.issued | 2016-06 | |
dc.identifier.issn | 0931-2250 | |
dc.identifier.other | DOI: 10.1111/jac.12136 | |
dc.identifier.uri | http://hdl.handle.net/20.500.12123/905 | |
dc.identifier.uri | http://onlinelibrary.wiley.com/doi/10.1111/jac.12136/abstract | |
dc.description.abstract | Breeding has developed better yielding maize hybrids for low N environments, which also have delayed leaf senescence (‘stay green’ trait, SG). Here, we studied whether the SG trait can further improve yield of modern hybrids under N-limiting conditions. In two field experiments, four maize hybrids with different senescence behaviour were grown under three N fertilization levels, from 0 to 200 kg N ha 1 (N0, N100 and N200). After silking, hybrids differed for senescence depending on the canopy layer (P < 0.05): the SG AX878 only delayed senescence at the mid and upper canopy layers while the SG NK880 delayed senescence of all layers. Across N doses, higher yields were achieved by both SG hybrids, AX878 and NK880 (P < 0.05) but yield was not only determined by senescence behaviour. Kernel weight (KW) response to N availability was larger for SGs than for their non-‘stay green’ counterparts. Delayed senescence in SG hybrids was not related to higher post-silking N uptake but to higher (P < 0.05) %N in leaves and lower (P < 0.05) %N in kernels at harvest (below the critical 1.1 % under N deficiency). Across N levels, KW positively related to N content per kernel, with a steeper slope (P < 0.05) for the SG hybrids. Taken together, our results suggest that a condition where N limits kernel growth, in a scenario of saturating C availability, may be common to stay green genotypes of maize. | eng |
dc.format | application/pdf | eng |
dc.language.iso | eng | |
dc.rights | info:eu-repo/semantics/restrictedAccess | eng |
dc.source | Journal of agronomy and crop science 202 (3) : 231-242. (2016) | eng |
dc.subject | Maíz | es_AR |
dc.subject | Maize | eng |
dc.subject | Nitrógeno | es_AR |
dc.subject | Nitrogen | eng |
dc.subject | Híbridos | es_AR |
dc.subject | Hybrids | eng |
dc.subject | Deficiencia de Nutrientes | |
dc.subject | Nutrient Deficiencies | eng |
dc.title | Responses to N Deficiency in Stay Green and Non-Stay Green Argentinean Hybrids of Maize | eng |
dc.type | info:ar-repo/semantics/artículo | es_AR |
dc.type | info:eu-repo/semantics/article | eng |
dc.type | info:eu-repo/semantics/publishedVersion | eng |
dc.description.fil | Fil: Antonietta, Mariana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Fisiología Vegetal. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Fisiología Vegetal; Argentina | |
dc.description.fil | Fil: Acciaresi, Horacio Abel.. Universidad Nacional de La Plata. Facultad de Ciencias Agrarias y Forestales; Argentina. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Pergamino; Argentina | |
dc.description.fil | Fil: Guiamet, Juan Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Fisiología Vegetal; Argentina; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Agrarias y Forestales; Argentina | |
dc.subtype | cientifico |
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