The genetic effects in hybrid lines of tropical corn (Zea mays L.) III. Lodging, uncovered ears and ear rot.
This study report genetic effects for lodging, uncovered ears and ear rot, of 42 single cross hybrids made with seven lines developed in the humid tropic of México, and six lines developed in the dry tropic, using a North Caroline II mating design. Hybrid variation was mainly due to GCA variance, and scanty to SCA variance for all the three attributes, although for ear rot, SCA variance had a considerable role, too. Partitioning GCA variance, revealed humid tropic lines had highest contribution to lodging and ear covering variance, and dry tropic lines the highest contribution to ear rot variance. In addition, humid tropic lines had higher GCAxEnvironment interaction variance than dry tropic lines. In conclusion, GCA effects, which reveal additive genetic variance, were the main effects for all the three attributes, and that GCA effects were higher in humid tropic lines than those of the dry tropic, maybe due to their mobilization in a more ample and diverse region.
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oai:portal.ucr.ac.cr:article247882023-06-16T13:58:54Z The genetic effects in hybrid lines of tropical corn (Zea mays L.) III. Lodging, uncovered ears and ear rot. Efectos genéticos en híbridos de maíz tropical (Zea mays L.) III. Acame, mala cobertura y pudrición de mazorca. Martínez, Gaspar de León-Castillo, Humberto This study report genetic effects for lodging, uncovered ears and ear rot, of 42 single cross hybrids made with seven lines developed in the humid tropic of México, and six lines developed in the dry tropic, using a North Caroline II mating design. Hybrid variation was mainly due to GCA variance, and scanty to SCA variance for all the three attributes, although for ear rot, SCA variance had a considerable role, too. Partitioning GCA variance, revealed humid tropic lines had highest contribution to lodging and ear covering variance, and dry tropic lines the highest contribution to ear rot variance. In addition, humid tropic lines had higher GCAxEnvironment interaction variance than dry tropic lines. In conclusion, GCA effects, which reveal additive genetic variance, were the main effects for all the three attributes, and that GCA effects were higher in humid tropic lines than those of the dry tropic, maybe due to their mobilization in a more ample and diverse region. En este trabajo se estimaron los efectos genéticos del acame, cobertura y pudrición de mazorca, en 42 híbridos simples hechos entre seis líneas desarrolladas en el trópico seco de México y siete en el trópico húmedo, usando un diseño de apareamiento II de Carolina del Norte. La variación entre los híbridos fue principalmente debida a la varianza de la ACG, y en una pequeña proporción a la varianza de la ACE en los tres caracteres, aunque para pudrición de mazorca la varianza de la ACE tuvo un papel considerable. La partición de la varianza de la ACG mostró que las líneas del trópico húmedo tuvieron mayor aportación en el acame de planta y cobertura de mazorca; en tanto que para pudrición de mazorca, las líneas del trópico seco tuvieron mayor contribución. Se observó interacción de los efectos de ACG con los ambientes de prueba, mayor en las líneas del trópico húmedo que en las del trópico seco. Las conclusiones fueron que los efectos de ACG, los cuales indican varianza aditiva, son mayores para los tres caracteres y que, a su vez, fueron mayores en las líneas del trópico húmedo, aparentemente debido a su movilización en una región más amplia y diversa durante su desarrollo genotécnico. Universidad de Costa Rica 2016-06-02 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Article application/pdf https://revistas.ucr.ac.cr/index.php/agromeso/article/view/24788 10.15517/am.v7i1.24788 Agronomía Mesoamericana; 1996: Agronomía Mesoamericana: Vol. 7, Issue 1 (January-June); 47-52 Agronomía Mesoamericana; 1996: Agronomía Mesoamericana: Vol 7, Nº 1 (Enero-junio); 47-52 Agronomía Mesoamericana; 1996: Agronomía Mesoamericana: Vol. 7, Issue 1 (January-June); 47-52 2215-3608 1021-7444 spa https://revistas.ucr.ac.cr/index.php/agromeso/article/view/24788/25001 |
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Bibioteca de la Facultad de Agronomía |
| language |
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| author |
Martínez, Gaspar de León-Castillo, Humberto |
| spellingShingle |
Martínez, Gaspar de León-Castillo, Humberto The genetic effects in hybrid lines of tropical corn (Zea mays L.) III. Lodging, uncovered ears and ear rot. |
| author_facet |
Martínez, Gaspar de León-Castillo, Humberto |
| author_sort |
Martínez, Gaspar |
| title |
The genetic effects in hybrid lines of tropical corn (Zea mays L.) III. Lodging, uncovered ears and ear rot. |
| title_short |
The genetic effects in hybrid lines of tropical corn (Zea mays L.) III. Lodging, uncovered ears and ear rot. |
| title_full |
The genetic effects in hybrid lines of tropical corn (Zea mays L.) III. Lodging, uncovered ears and ear rot. |
| title_fullStr |
The genetic effects in hybrid lines of tropical corn (Zea mays L.) III. Lodging, uncovered ears and ear rot. |
| title_full_unstemmed |
The genetic effects in hybrid lines of tropical corn (Zea mays L.) III. Lodging, uncovered ears and ear rot. |
| title_sort |
genetic effects in hybrid lines of tropical corn (zea mays l.) iii. lodging, uncovered ears and ear rot. |
| description |
This study report genetic effects for lodging, uncovered ears and ear rot, of 42 single cross hybrids made with seven lines developed in the humid tropic of México, and six lines developed in the dry tropic, using a North Caroline II mating design. Hybrid variation was mainly due to GCA variance, and scanty to SCA variance for all the three attributes, although for ear rot, SCA variance had a considerable role, too. Partitioning GCA variance, revealed humid tropic lines had highest contribution to lodging and ear covering variance, and dry tropic lines the highest contribution to ear rot variance. In addition, humid tropic lines had higher GCAxEnvironment interaction variance than dry tropic lines. In conclusion, GCA effects, which reveal additive genetic variance, were the main effects for all the three attributes, and that GCA effects were higher in humid tropic lines than those of the dry tropic, maybe due to their mobilization in a more ample and diverse region. |
| publisher |
Universidad de Costa Rica |
| publishDate |
2016 |
| url |
https://revistas.ucr.ac.cr/index.php/agromeso/article/view/24788 |
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