Prospective genetic gain to improve salinity tolerance in a population of Panicum coloratum var. coloratum with two different selection methods
Panicum coloratum var. coloratum is a subtropical grass for potentially increasing forage production in lowly productive environments where cattle-raising activities have been relocated. Heritability was estimated for characters related to salinity tolerance under saline and non-saline conditions to...
| Autores: | , , , , , |
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| Tipo de documento: | artigo |
| Estado: | Versão publicada |
| Data de publicação: | 2021 |
| País: | Argentina |
| Recursos: | Instituto Nacional de Tecnología Agropecuaria |
| Repositório: | INTA Digital (INTA) |
| Idioma: | inglês |
| OAI Identifier: | oai:localhost:20.500.12123/9882 |
| Acesso em linha: | http://hdl.handle.net/20.500.12123/9882 https://www.tropicalgrasslands.info/index.php/tgft/article/view/868 https://doi.org/10.17138/tgft(9)171-181 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Panicum Coloratum Fitomejoramiento Tolerancia a la Sal Variación Genética Fenotipos Plant Breeding Salt Tolerance Genetic Variation Phenotypes Genetic Gain Mejora Genética |
| Resumo: | Panicum coloratum var. coloratum is a subtropical grass for potentially increasing forage production in lowly productive environments where cattle-raising activities have been relocated. Heritability was estimated for characters related to salinity tolerance under saline and non-saline conditions to explore the possibility of improving tolerance by selection. From a base germplasm collected in a very harsh environment, heritability and gain after selection were calculated using 2 recombination units: individual and phenotypic family mean (PFM). Heritability estimates were very low for all characters both in saline and non-saline conditions, suggesting a complex genetic control of salinity tolerance, with a high proportion of non-additive genetic effects. Estimates were higher using individual selection than with PFM and expected genetic gains were higher for individual selection. When compared in both saline and non-saline conditions, predicted means were greater than for plants of cv. Klein, the most common cultivar in use. It appears that the analyzed germplasm would be a valuable source of genes to be included in breeding programs to increase salinity tolerance in Panicum coloratum. |
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