Efficiency of high-nitrogen selection environments for improving maize for low-nitrogen target environments
Most maize (Zea mays L.) in the tropics is grown under low‐nitrogen (N) conditions, raising the need to assess efficient breeding strategies for such conditions. This study assesses the value of low‐N vs. high‐N selection environments for improving lowland tropical maize for low‐N target environment...
| Main Authors: | , , |
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| Format: | Journal Article |
| Language: | Inglés |
| Published: |
Wiley
1997
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| Online Access: | https://hdl.handle.net/10568/167236 |
| _version_ | 1855517334719954944 |
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| author | Bänziger, M. Betrán, F.J. Lafitte, H.R. |
| author_browse | Betrán, F.J. Bänziger, M. Lafitte, H.R. |
| author_facet | Bänziger, M. Betrán, F.J. Lafitte, H.R. |
| author_sort | Bänziger, M. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Most maize (Zea mays L.) in the tropics is grown under low‐nitrogen (N) conditions, raising the need to assess efficient breeding strategies for such conditions. This study assesses the value of low‐N vs. high‐N selection environments for improving lowland tropical maize for low‐N target environments. Fourteen replicated trials grown under low (no N applied) and high (200 kg N Ha−1 applied) N at CIMMYT, México, between 1986 and 1995 were analyzed for broad‐sense heritability of grain yield, genetic correlation between grain yields under low and high N, and predicted response of grain yield under low N to selection under either low or high N. Broad‐sense heritabilities for grain yield under low N were on average 29% sm ller than under high N because of lower genotypic variances under low N. Error variances were similar at low and highN. Genetic correlations between grain yields under low and high N were generally positive. They decreased with increasing relative yield reduction under low N, indicating that specific adaptation to either low or high N became more important the more low‐N and high‐N experiments differed in grain yield. Selection under high N for performance under low N was predicted significantly less efficient than selection under low N when relative yield reduction due to N stress exceeded 43%. Maize breeding programs targeting low‐N environments in the tropics should include low‐N selection environments to maximize selection gains. |
| format | Journal Article |
| id | CGSpace167236 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1997 |
| publishDateRange | 1997 |
| publishDateSort | 1997 |
| publisher | Wiley |
| publisherStr | Wiley |
| record_format | dspace |
| spelling | CGSpace1672362025-05-14T10:39:31Z Efficiency of high-nitrogen selection environments for improving maize for low-nitrogen target environments Bänziger, M. Betrán, F.J. Lafitte, H.R. Most maize (Zea mays L.) in the tropics is grown under low‐nitrogen (N) conditions, raising the need to assess efficient breeding strategies for such conditions. This study assesses the value of low‐N vs. high‐N selection environments for improving lowland tropical maize for low‐N target environments. Fourteen replicated trials grown under low (no N applied) and high (200 kg N Ha−1 applied) N at CIMMYT, México, between 1986 and 1995 were analyzed for broad‐sense heritability of grain yield, genetic correlation between grain yields under low and high N, and predicted response of grain yield under low N to selection under either low or high N. Broad‐sense heritabilities for grain yield under low N were on average 29% sm ller than under high N because of lower genotypic variances under low N. Error variances were similar at low and highN. Genetic correlations between grain yields under low and high N were generally positive. They decreased with increasing relative yield reduction under low N, indicating that specific adaptation to either low or high N became more important the more low‐N and high‐N experiments differed in grain yield. Selection under high N for performance under low N was predicted significantly less efficient than selection under low N when relative yield reduction due to N stress exceeded 43%. Maize breeding programs targeting low‐N environments in the tropics should include low‐N selection environments to maximize selection gains. 1997-07 2024-12-19T12:57:09Z 2024-12-19T12:57:09Z Journal Article https://hdl.handle.net/10568/167236 en Wiley Bänziger, M.; Betrán, F. J. and Lafitte, H. R. 1997. Efficiency of high-nitrogen selection environments for improving maize for low-nitrogen target environments. Crop Science, Volume 37 no. 4 p. 1103-1109 |
| spellingShingle | Bänziger, M. Betrán, F.J. Lafitte, H.R. Efficiency of high-nitrogen selection environments for improving maize for low-nitrogen target environments |
| title | Efficiency of high-nitrogen selection environments for improving maize for low-nitrogen target environments |
| title_full | Efficiency of high-nitrogen selection environments for improving maize for low-nitrogen target environments |
| title_fullStr | Efficiency of high-nitrogen selection environments for improving maize for low-nitrogen target environments |
| title_full_unstemmed | Efficiency of high-nitrogen selection environments for improving maize for low-nitrogen target environments |
| title_short | Efficiency of high-nitrogen selection environments for improving maize for low-nitrogen target environments |
| title_sort | efficiency of high nitrogen selection environments for improving maize for low nitrogen target environments |
| url | https://hdl.handle.net/10568/167236 |
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