Abstract
Rubber tree breeding programs are mainly driven by selection of individuals with high yield and quality of rubber. Data from 51 open-pollinated progenies tested on six sites in Brazil were analyzed over several traits to estimate the following: genetic parameters such as narrow-sense heritability and additive genetic variance in single- and multi-site analyses, type B correlations to determine the relevance of genotype-by-environment interactions and its effects on alternative selection strategies, additive genetic repeatability correlation for rubber yield based on three consecutive yearly measurements, and type A correlations to evaluate trait-to-trait genetic associations for all measured traits. Average rubber yield (RYm) showed an estimated narrow-sense heritability of 0.31, with an estimated type B correlation of 0.84, indicating low levels of genotype-by-environment interaction. The trait survival and number of latex vessel rings (RG) showed larger genotype-by-environment interaction and the lowest heritabilites. High to moderate type B correlation was found for most traits, with a value of 0.85 between diameter (or girth) and RYm; therefore, it is possible to achieve interesting rubber yield genetic gains (over 3 years of measurements) from indirect selection based on diameter at age 2.
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Acknowledgments
This work was supported by the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), and Secretaria de Agricultura e Abastecimento do Estado de São Paulo, Brazil. We want to thank several researchers responsible for the trials: Mario Luiz Teixeira de Moraes (Single Island), Elaine Cristine Piffer Gonçalves (Colina), and Erivaldo José Scaloppi Jr. (Votuporanga). And, we also thank Dr. Rowland Burdon for his dedicated comments on this manuscript.
Data Archiving Statement
We followed standard Tree Genetics and Genomes policy. Data used in the study came from Instituto Agronômico. In addition, supplementary information of original genotype numbers/names and data are included in the Supplemental Files.
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Silva, G.A.P., Gezan, S.A., de Carvalho, M.P. et al. Genetic parameters in a rubber tree population: heritabilities, genotype-by-environment interactions and multi-trait correlations. Tree Genetics & Genomes 10, 1511–1518 (2014). https://doi.org/10.1007/s11295-014-0766-5
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DOI: https://doi.org/10.1007/s11295-014-0766-5