Maize genetic progress in the central Pampas of Argentina: effects of contrasting sowing dates
Delayed sowing date of maize (Zea mays L.) has become a broadly adopted practice in the Pampas region of Argentina, because late-sown crops frequently experience a more favorable water balance around flowering and a reduction in the year-to-year yield variation. However, breeding efforts in this reg...
| Autores principales: | , , , , , |
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| Formato: | info:ar-repo/semantics/artículo |
| Lenguaje: | Inglés |
| Publicado: |
Elsevier
2022
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| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.12123/11968 https://www.sciencedirect.com/science/article/pii/S0378429022000636 https://doi.org/10.1016/j.fcr.2022.108492 |
| _version_ | 1855036670251892736 |
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| author | Amas, Juan Ignacio Fernandez, Javier A. Curin, Facundo Cirilo, Alfredo Gabriel Ciampitti, Ignacio A. Otegui, María Elena |
| author_browse | Amas, Juan Ignacio Ciampitti, Ignacio A. Cirilo, Alfredo Gabriel Curin, Facundo Fernandez, Javier A. Otegui, María Elena |
| author_facet | Amas, Juan Ignacio Fernandez, Javier A. Curin, Facundo Cirilo, Alfredo Gabriel Ciampitti, Ignacio A. Otegui, María Elena |
| author_sort | Amas, Juan Ignacio |
| collection | INTA Digital |
| description | Delayed sowing date of maize (Zea mays L.) has become a broadly adopted practice in the Pampas region of Argentina, because late-sown crops frequently experience a more favorable water balance around flowering and a reduction in the year-to-year yield variation. However, breeding efforts in this region have been focused on early sowing date environments. In addition, there has been no research on genetic progress of grain yield and the underlying attributes under late-sowing conditions. The aim of this study was to compare genetic progress in grain yield and secondary traits for hybrids released between 1980 and 2016 when grown in early- versus late sowing environments in the central Pampas region. Grain yield, its components (kernel number and kernel weight), and its physiological determinants (total shoot biomass and harvest index) were assessed in two contrasting sowing dates during three years. Biomass at silking (BR1) and during the post-silking period (BR1-R6), plant growth rate and source-sink ratios during the critical and the effective kernel-filling periods were also analyzed. Grain yield genetic progress was similar for early (0.9% y-1) relative to late sowing dates (0.8% y-1). Kernel number increase with the year of release (YOR) was more important in early (0.6% y-1) than in late (0.4% y-1) sowings, whereas the opposite trend was documented for kernel weight (0.2% and 0.3% y-1, respectively). Newer hybrids showed greater biomass production in both sowing dates (0.8% y-1 for early, 0.6% y-1 for late) and a slight increase in harvest index in late sowings (0.2% y-1). Breeding effects on shoot biomass production were exclusively attributed to the post-silking period (1.2% y-1 for early and 0.9% y-1 for late), as BR1 remained unchanged with YOR. Assimilate availability per kernel during the effective kernel filling increased with YOR in both sowing dates (1.0% y-1 for early and 0.9% y-1 for late), promoting a longer kernel filling duration. Results demonstrated that breeding efforts focused on early sowings as the main target environment, have also impacted yield gains in late sowings. However, the enhanced importance of kernel weight on grain yield determination among late- than among early sowings will demand future breeding strategies to pay special attention to unfavorable photothermal conditions during kernel filling. |
| format | info:ar-repo/semantics/artículo |
| id | INTA11968 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2022 |
| publishDateRange | 2022 |
| publishDateSort | 2022 |
| publisher | Elsevier |
| publisherStr | Elsevier |
| record_format | dspace |
| spelling | INTA119682022-05-30T16:14:44Z Maize genetic progress in the central Pampas of Argentina: effects of contrasting sowing dates Amas, Juan Ignacio Fernandez, Javier A. Curin, Facundo Cirilo, Alfredo Gabriel Ciampitti, Ignacio A. Otegui, María Elena Maíz Fecha de Siembra Fitomejoramiento Rendimiento Factores Ambientales Granos Maize Sowing Date Plant Breeding Yields Environmental Factors Grain Grano de Maíz Región Pampeana Delayed sowing date of maize (Zea mays L.) has become a broadly adopted practice in the Pampas region of Argentina, because late-sown crops frequently experience a more favorable water balance around flowering and a reduction in the year-to-year yield variation. However, breeding efforts in this region have been focused on early sowing date environments. In addition, there has been no research on genetic progress of grain yield and the underlying attributes under late-sowing conditions. The aim of this study was to compare genetic progress in grain yield and secondary traits for hybrids released between 1980 and 2016 when grown in early- versus late sowing environments in the central Pampas region. Grain yield, its components (kernel number and kernel weight), and its physiological determinants (total shoot biomass and harvest index) were assessed in two contrasting sowing dates during three years. Biomass at silking (BR1) and during the post-silking period (BR1-R6), plant growth rate and source-sink ratios during the critical and the effective kernel-filling periods were also analyzed. Grain yield genetic progress was similar for early (0.9% y-1) relative to late sowing dates (0.8% y-1). Kernel number increase with the year of release (YOR) was more important in early (0.6% y-1) than in late (0.4% y-1) sowings, whereas the opposite trend was documented for kernel weight (0.2% and 0.3% y-1, respectively). Newer hybrids showed greater biomass production in both sowing dates (0.8% y-1 for early, 0.6% y-1 for late) and a slight increase in harvest index in late sowings (0.2% y-1). Breeding effects on shoot biomass production were exclusively attributed to the post-silking period (1.2% y-1 for early and 0.9% y-1 for late), as BR1 remained unchanged with YOR. Assimilate availability per kernel during the effective kernel filling increased with YOR in both sowing dates (1.0% y-1 for early and 0.9% y-1 for late), promoting a longer kernel filling duration. Results demonstrated that breeding efforts focused on early sowings as the main target environment, have also impacted yield gains in late sowings. However, the enhanced importance of kernel weight on grain yield determination among late- than among early sowings will demand future breeding strategies to pay special attention to unfavorable photothermal conditions during kernel filling. EEA Pergamino Fil: Amas, Juan I. Instituto Nacional de Tecnología Agropecuaria (INTA). Centro Regional Buenos Aires Norte. Estación Experimental Agropecuaria Pergamino; Argentina Fil: Amas, Juan I. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Fernandez, Javier A. Kansas State University. Department of Agronomy; Estados Unidos Fil: Curín, Facundo. Centro de Investigaciones y Transferencias del Noroeste de la Provincia de Buenos Aires (CIT-NOBA-CONICET); Argentina Fil: Cirilo, Alfredo Gabriel. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Pergamino. Ecofisiología; Argentina Fil: Ciampitti, Ignacio A. Kansas State University. Department of Agronomy; Estados Unidos Fil: Otegui, María E. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Otegui, María Elena. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Pergamino. Ecofisiología; Argentina Fil: Otegui, María E. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Producción Vegetal; Argentina 2022-05-30T16:09:54Z 2022-05-30T16:09:54Z 2022-05 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.12123/11968 https://www.sciencedirect.com/science/article/pii/S0378429022000636 0378-4290 https://doi.org/10.1016/j.fcr.2022.108492 eng info:eu-repo/semantics/restrictedAccess application/pdf Elsevier Field Crops Research Volume 281 (15) : 108492. (May 2022) |
| spellingShingle | Maíz Fecha de Siembra Fitomejoramiento Rendimiento Factores Ambientales Granos Maize Sowing Date Plant Breeding Yields Environmental Factors Grain Grano de Maíz Región Pampeana Amas, Juan Ignacio Fernandez, Javier A. Curin, Facundo Cirilo, Alfredo Gabriel Ciampitti, Ignacio A. Otegui, María Elena Maize genetic progress in the central Pampas of Argentina: effects of contrasting sowing dates |
| title | Maize genetic progress in the central Pampas of Argentina: effects of contrasting sowing dates |
| title_full | Maize genetic progress in the central Pampas of Argentina: effects of contrasting sowing dates |
| title_fullStr | Maize genetic progress in the central Pampas of Argentina: effects of contrasting sowing dates |
| title_full_unstemmed | Maize genetic progress in the central Pampas of Argentina: effects of contrasting sowing dates |
| title_short | Maize genetic progress in the central Pampas of Argentina: effects of contrasting sowing dates |
| title_sort | maize genetic progress in the central pampas of argentina effects of contrasting sowing dates |
| topic | Maíz Fecha de Siembra Fitomejoramiento Rendimiento Factores Ambientales Granos Maize Sowing Date Plant Breeding Yields Environmental Factors Grain Grano de Maíz Región Pampeana |
| url | http://hdl.handle.net/20.500.12123/11968 https://www.sciencedirect.com/science/article/pii/S0378429022000636 https://doi.org/10.1016/j.fcr.2022.108492 |
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