Genetic progress, adaptability and stability of maize cultivars for value of cultivation and use trials



Título del documento: Genetic progress, adaptability and stability of maize cultivars for value of cultivation and use trials
Revue: Acta scientiarum. Agronomy
Base de datos: PERIÓDICA
Número de sistema: 000460102
ISSN: 1679-9275
Autores: 1
2
3
4
5
3
Instituciones: 1Universidade Eduardo Mondlane, Escola Superior de Desenvolvimento Rural, Maputo. Mozambique
2Escola Superior de Negocios e Empreendedorismo de Chibuto, Chibuto, Gaza. Mozambique
3Universidade Federal de Lavras, Departamento de Estatistica, Lavras, Minas Gerais. Brasil
4Empresa Brasileira de Pesquisa Agropecuaria, Milho e Sorgo, Sete Lagoas, Minas Gerais. Brasil
5Universidade Federal de Lavras, Departamento de Agricultura, Lavras, Minas Gerais. Brasil
Año:
Volumen: 41
País: Brasil
Idioma: Inglés
Tipo de documento: Artículo
Enfoque: Analítico, descriptivo
Resumen en inglés Maize breeding programs conduct multi-environment trials every year to assess the performance of new cultivars in pre-releasing tests. The data are combined across sites and seasons to perform a joint analysis in order to obtain information that will help breeders to select the best cultivars for different environments. Beyond this, it is essential to understand the different factors that can hamper the selection and genetic progress (i.e., genetic variability, selection intensity and genotype-by-environment interactions). In this study, the genetic progress (GP) was estimated and the adaptability and stability of 81 maize genotypes were evaluated in a series of trials for the value of cultivation and use (VCU) between the 2010/11 and 2014/15 growing seasons. The genotypes were composed of open-pollinated varieties, topcross hybrids, intervarietal hybrids, and single, double and three-way cross hybrids and were assessed in 117 environments in the central region of Brazil, from which 22 presented environmental stresses. For grain yield, an annual GP of 331.5 kg ha-1 was observed, thus showing efficiency in the selection of superior cultivars. Additionally, it was observed that some low-cost seed cultivars showed yield potential, adaptability and stability estimates that were compatible with commercial hybrids, thus making them quite attractive for cultivation in environments with or without abiotic stresses
Disciplinas: Agrociencias,
Biología
Palabras clave: Gramíneas,
Genética,
Maíz,
Modelos mixtos,
Ganancia genética,
Biplot
Keyword: Gramineae,
Genetics,
Corn,
Mixed models,
Genetic gain,
Biplot
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