Source-sink relations and kernel weight in maize inbred lines and hybrids : responses to contrasting nitrogen supply levels
Maize (Zea mays, L.) kernel weight (KW) is regulated by the source-sink relationship at the early grain-filling period, when potential kernel size is defined, and at the effective grain-filling period, when final KW is established. The relative importance of each period is expected to depend upon th...
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| Format: | Artículo |
| Language: | Inglés |
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Elsevier
2019
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| Online Access: | http://hdl.handle.net/20.500.12123/5324 https://www.sciencedirect.com/science/article/pii/S0378429018308591 https://doi.org/10.1016/j.fcr.2018.10.011 |
| _version_ | 1855483601978654720 |
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| author | Hisse, Ignacio R. D'Andrea, Karina Elizabeth Otegui, María Elena |
| author_browse | D'Andrea, Karina Elizabeth Hisse, Ignacio R. Otegui, María Elena |
| author_facet | Hisse, Ignacio R. D'Andrea, Karina Elizabeth Otegui, María Elena |
| author_sort | Hisse, Ignacio R. |
| collection | INTA Digital |
| description | Maize (Zea mays, L.) kernel weight (KW) is regulated by the source-sink relationship at the early grain-filling period, when potential kernel size is defined, and at the effective grain-filling period, when final KW is established. The relative importance of each period is expected to depend upon the occurrence or not of environmental restrictions to plant growth. The objective of this study was to analyze the effect of nitrogen (N) availability on KW determination in two different groups of genotypes (inbreds and hybrids) when it is caused by changes in the source-sink relationship at mentioned periods. Six inbred lines of different genetic background and their F1 derived hybrids were tested in the field under two contrasting soil N levels (N0: low; N1: high). Almost all evaluated traits had greater mean values (P < 0.001) at N1 than at N0 level, except the plant growth rate per kernel during the critical period for kernel set (PGRCP kernel−1). However, the magnitude of the response to increased N was considerably higher for hybrids than for inbreds. Under contrasting N availability, plant growth during grain filling (PGGF) was the main determinant of increments registered in the source-sink ratio during this stage (i.e. PGGF kernel−1), and KW was chiefly associated with this ratio (r2 ≥ 0.50, P < 0.001). By contrast, the association between KW and PGRCP kernel-1 was important only at N1, and more robust for hybrids (r2 = 0.61, P < 0.001) than for inbreds (r2 = 0.34, P < 0.001). The uncoupling between both source-sink ratios observed at N0, as a result of a decreased post-flowering growth in this treatment, was responsible for differences in KW response to the PGRCP kernel−1 detected between N levels. The KW of inbreds was almost unaffected by mentioned N effects on the analyzed source-sink ratios, a trend attributed to negative inbreeding depression effects on traits controlling seed expansion. These differential responses between genotypic groups should be considered in breeding programs targeting KW increase. |
| format | Artículo |
| id | INTA5324 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2019 |
| publishDateRange | 2019 |
| publishDateSort | 2019 |
| publisher | Elsevier |
| publisherStr | Elsevier |
| record_format | dspace |
| spelling | INTA53242024-08-19T12:56:39Z Source-sink relations and kernel weight in maize inbred lines and hybrids : responses to contrasting nitrogen supply levels Hisse, Ignacio R. D'Andrea, Karina Elizabeth Otegui, María Elena Maíz Granos Nitrógeno Genotipos Híbridos Evaluación Maize Grain Nitrogen Genotypes Hybrids Assessment Llenado de grano Peso del grano Maize (Zea mays, L.) kernel weight (KW) is regulated by the source-sink relationship at the early grain-filling period, when potential kernel size is defined, and at the effective grain-filling period, when final KW is established. The relative importance of each period is expected to depend upon the occurrence or not of environmental restrictions to plant growth. The objective of this study was to analyze the effect of nitrogen (N) availability on KW determination in two different groups of genotypes (inbreds and hybrids) when it is caused by changes in the source-sink relationship at mentioned periods. Six inbred lines of different genetic background and their F1 derived hybrids were tested in the field under two contrasting soil N levels (N0: low; N1: high). Almost all evaluated traits had greater mean values (P < 0.001) at N1 than at N0 level, except the plant growth rate per kernel during the critical period for kernel set (PGRCP kernel−1). However, the magnitude of the response to increased N was considerably higher for hybrids than for inbreds. Under contrasting N availability, plant growth during grain filling (PGGF) was the main determinant of increments registered in the source-sink ratio during this stage (i.e. PGGF kernel−1), and KW was chiefly associated with this ratio (r2 ≥ 0.50, P < 0.001). By contrast, the association between KW and PGRCP kernel-1 was important only at N1, and more robust for hybrids (r2 = 0.61, P < 0.001) than for inbreds (r2 = 0.34, P < 0.001). The uncoupling between both source-sink ratios observed at N0, as a result of a decreased post-flowering growth in this treatment, was responsible for differences in KW response to the PGRCP kernel−1 detected between N levels. The KW of inbreds was almost unaffected by mentioned N effects on the analyzed source-sink ratios, a trend attributed to negative inbreeding depression effects on traits controlling seed expansion. These differential responses between genotypic groups should be considered in breeding programs targeting KW increase. EEA Pergamino Fil: Hisse, Ignacio R. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Producción Vigetal; Argentina. Consejo Nacional de Investigación Científicas y Técnicas; Argentina Fil: D'Andrea, Karina Elizabeth. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Producción Vegetal; Argentina. Consejo Nacional de Investigaciones, Científicas y Técnicas; Argentina Fil: Otegui, María. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Pergamino. Departamento de Ecofisiología; Argentina. Consejo Nacional de Investigaciones, Científicas y Técnicas - Universidad de Buenos Aires. Facultad de Agronomía (CONICET- FAUBA); Argentina 2019-06-18T11:07:09Z 2019-06-18T11:07:09Z 2019-01 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.12123/5324 https://www.sciencedirect.com/science/article/pii/S0378429018308591 0378-4290 https://doi.org/10.1016/j.fcr.2018.10.011 eng info:eu-repo/semantics/restrictedAccess application/pdf Elsevier Field Crops Research 230 : 151-159 (January 2019) |
| spellingShingle | Maíz Granos Nitrógeno Genotipos Híbridos Evaluación Maize Grain Nitrogen Genotypes Hybrids Assessment Llenado de grano Peso del grano Hisse, Ignacio R. D'Andrea, Karina Elizabeth Otegui, María Elena Source-sink relations and kernel weight in maize inbred lines and hybrids : responses to contrasting nitrogen supply levels |
| title | Source-sink relations and kernel weight in maize inbred lines and hybrids : responses to contrasting nitrogen supply levels |
| title_full | Source-sink relations and kernel weight in maize inbred lines and hybrids : responses to contrasting nitrogen supply levels |
| title_fullStr | Source-sink relations and kernel weight in maize inbred lines and hybrids : responses to contrasting nitrogen supply levels |
| title_full_unstemmed | Source-sink relations and kernel weight in maize inbred lines and hybrids : responses to contrasting nitrogen supply levels |
| title_short | Source-sink relations and kernel weight in maize inbred lines and hybrids : responses to contrasting nitrogen supply levels |
| title_sort | source sink relations and kernel weight in maize inbred lines and hybrids responses to contrasting nitrogen supply levels |
| topic | Maíz Granos Nitrógeno Genotipos Híbridos Evaluación Maize Grain Nitrogen Genotypes Hybrids Assessment Llenado de grano Peso del grano |
| url | http://hdl.handle.net/20.500.12123/5324 https://www.sciencedirect.com/science/article/pii/S0378429018308591 https://doi.org/10.1016/j.fcr.2018.10.011 |
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