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resumen

Resumen
Maize (Zea mays L.) breeding based primarily on final grain yield has been successful in improving this trait since the introduction of hybrids. Contrarily, understanding of the variation in ecophysiological processes responsible of this improvement is limited, especially between parental inbred lines and their hybrids. This limitation may hinder future progress in genetic gain, especially in environments where heritability estimation is reduced because [ver mas...]
dc.contributor.authorD'Andrea, Karina Elizabeth
dc.contributor.authorOtegui, María Elena
dc.contributor.authorCirilo, Alfredo Gabriel
dc.contributor.authorEyherabide, Guillermo
dc.date.accessioned2020-05-07T14:55:25Z
dc.date.available2020-05-07T14:55:25Z
dc.date.issued2009-10
dc.identifier.issn0378-4290
dc.identifier.otherhttps://doi.org/10.1016/j.fcr.2009.07.016
dc.identifier.urihttp://hdl.handle.net/20.500.12123/7203
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0378429009002032
dc.description.abstractMaize (Zea mays L.) breeding based primarily on final grain yield has been successful in improving this trait since the introduction of hybrids. Contrarily, understanding of the variation in ecophysiological processes responsible of this improvement is limited, especially between parental inbred lines and their hybrids. This limitation may hinder future progress in genetic gain, especially in environments where heritability estimation is reduced because grain yield is severely affected by abiotic stresses. The objective of this study was to analyze the genotypic variation between inbred lines and derived hybrids in the physiological determinants of maize grain yield at the crop level, and how differences among hybrids and parental inbreds may effect contrasting responses to N stress. Special emphasis was given to biomass production and partitioning during the critical period for kernel number determination. Phenotyping included the evaluation of 26 morpho-physiological attributes for 6 maize inbred lines and 12 derived hybrids, cropped in the field at contrasting N supply levels (N0: no N added; N400: 400 kg N ha−1 applied as urea) during three growing seasons. Tested genotypes differed in the response to reduce N supply for most measured traits. Grain yield was always larger for hybrids than for inbreds, but N deficiency affected the former more than the latter (average reduction in grain yield of 40% for hybrids and of 24% for inbreds). We also found (i) a common pattern across genotypes and N levels for the response of kernel number per plant to plant growth rate during the critical period, (ii) a reduced apical ear reproductive capacity (i.e., kernel set per unit of ear growth rate) of inbreds as compared to hybrids, (iii) similar RUE during the critical period and N absorption at maturity at low N levels for both groups of genotypes, but enhanced RUE and N absorption of hybrids at high N supply levels, and (iv) an improved N utilization efficiency of hybrids across all levels of N supply. Results are indicative of a more efficient use of absorbed N by hybrids than by parental inbreds. Larger grain yield of hybrids than of inbreds at N0 was associated to (i) enhanced dry matter accumulation due to improved light interception during the life cycle and (ii) enhanced biomass partitioning to the grain.eng
dc.formatapplication/pdfes_AR
dc.language.isoenges_AR
dc.publisherElsevieres_AR
dc.rightsinfo:eu-repo/semantics/restrictedAccesses_AR
dc.sourceField Crops Research 114 (1) : 147-158. (October 2009)es_AR
dc.subjectGenéticaes_AR
dc.subjectGeneticseng
dc.subjectMaízes_AR
dc.subjectMaizeeng
dc.subjectVariación Genéticaes_AR
dc.subjectGenetic Variationeng
dc.subjectRendimiento de Cultivoses_AR
dc.subjectCrop Yieldeng
dc.subjectHíbridoses_AR
dc.subjectHybridseng
dc.subjectNitrógenoes_AR
dc.subjectNitrogeneng
dc.subject.otherEcofisiologíaes_AR
dc.titleEcophysiological traits in maize hybrids and their parental inbred lines: Phenotyping of responses to contrasting nitrogen supply levelses_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: D'Andrea, Karina Elizabeth. Consejo Nacional de Investigaciones, Científicas y Técnicas - Universidad de Buenos Aires. Facultad de Agronomía (CONICET- FAUBA); Argentinaes_AR
dc.description.filFil: Otegui, María E. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET); Argentina. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Producción Vegetal; Argentinaes_AR
dc.description.filFil: Cirilo, Alfredo Gabriel. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Pergamino. Ecofisiología; Argentinaes_AR
dc.description.filFil: Eyhérabide, Guillermo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Pergamino. Departamento de Laboratorio Biotecnología; Argentinaes_AR
dc.subtypecientifico


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