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Additive genetic variance and covariance between relatives in synthetic wheat crosses with variable parental ploidy levels.
Genetics. 2021 02 09; 217(2)G

Abstract

Cultivated bread wheat (Triticum aestivum L.) is an allohexaploid species resulting from the natural hybridization and chromosome doubling of allotetraploid durum wheat (T. turgidum) and a diploid goatgrass Aegilops tauschii Coss (Ae. tauschii). Synthetic hexaploid wheat (SHW) was developed through the interspecific hybridization of Ae. tauschii and T. turgidum, and then crossed to T. aestivum to produce synthetic hexaploid wheat derivatives (SHWDs). Owing to this founding variability, one may infer that the genetic variances of native wild populations vs improved wheat may vary due to their differential origin and evolutionary history. In this study, we partitioned the additive variance of SHW and SHWD with respect to their breed origin by fitting a hierarchical Bayesian model with heterogeneous covariance structure for breeding values to estimate variance components for each breed category, and segregation variance. Two data sets were used to test the proposed hierarchical Bayesian model, one from a multi-year multi-location field trial of SHWD and the other comprising the two species of SHW. For the SHWD, the Bayesian estimates of additive variances of grain yield from each breed category were similar for T. turgidum and Ae. tauschii, but smaller for T. aestivum. Segregation variances between Ae. tauschii-T. aestivum and T. turgidum-T. aestivum populations explained a sizable proportion of the phenotypic variance. Bayesian additive variance components and the Best Linear Unbiased Predictors (BLUPs) estimated by two well-known software programs were similar for multi-breed origin and for the sum of the breeding values by origin for both data sets. Our results support the suitability of models with heterogeneous additive genetic variances to predict breeding values in wheat crosses with variable ploidy levels.

Authors+Show Affiliations

Departamento de Métodos Cuantitativos y Sistemas de Información, Facultad de Agronomía, Universidad de Buenos Aires, 1417 Ciudad Autónoma de Buenos Aires, Argentina.Biometrics and Statistics Unit. International Maize and Wheat Improvement Center (CIMMYT), Carretera México -Veracruz, Km 45, Col. El Batán, CP 56237, Texcoco, Edo. de México, México. Departamento de Estadística, Colegio de Postgraduados, Montecillo, Edo. de México, CP. 56230, México.Departamento de Producción Animal, Facultad de Agronomía, Universidad de Buenos Aires. Instituto de Investigaciones en Producción Animal (INPA), Consejo Nacional de Investigaciones Científicas y Técnicas, 1417 Ciudad Autónoma de Buenos Aires, Argentina.Departamento de Estadística, Colegio de Postgraduados, Montecillo, Edo. de México, CP. 56230, México.Departamento de Producción Animal, Facultad de Agronomía, Universidad de Buenos Aires. Instituto de Investigaciones en Producción Animal (INPA), Consejo Nacional de Investigaciones Científicas y Técnicas, 1417 Ciudad Autónoma de Buenos Aires, Argentina.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

33724416

Citation

Puhl, L E., et al. "Additive Genetic Variance and Covariance Between Relatives in Synthetic Wheat Crosses With Variable Parental Ploidy Levels." Genetics, vol. 217, no. 2, 2021.
Puhl LE, Crossa J, Munilla S, et al. Additive genetic variance and covariance between relatives in synthetic wheat crosses with variable parental ploidy levels. Genetics. 2021;217(2).
Puhl, L. E., Crossa, J., Munilla, S., Pérez-Rodríguez, P., & Cantet, R. J. C. (2021). Additive genetic variance and covariance between relatives in synthetic wheat crosses with variable parental ploidy levels. Genetics, 217(2). https://doi.org/10.1093/genetics/iyaa048
Puhl LE, et al. Additive Genetic Variance and Covariance Between Relatives in Synthetic Wheat Crosses With Variable Parental Ploidy Levels. Genetics. 2021 02 9;217(2) PubMed PMID: 33724416.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Additive genetic variance and covariance between relatives in synthetic wheat crosses with variable parental ploidy levels. AU - Puhl,L E, AU - Crossa,J, AU - Munilla,S, AU - Pérez-Rodríguez,P, AU - Cantet,R J C, PY - 2020/10/18/received PY - 2020/12/17/accepted PY - 2021/3/16/entrez PY - 2021/3/17/pubmed PY - 2021/9/2/medline KW - additive genetic variance KW - breeding values KW - polyploidy KW - synthetic wheat JF - Genetics JO - Genetics VL - 217 IS - 2 N2 - Cultivated bread wheat (Triticum aestivum L.) is an allohexaploid species resulting from the natural hybridization and chromosome doubling of allotetraploid durum wheat (T. turgidum) and a diploid goatgrass Aegilops tauschii Coss (Ae. tauschii). Synthetic hexaploid wheat (SHW) was developed through the interspecific hybridization of Ae. tauschii and T. turgidum, and then crossed to T. aestivum to produce synthetic hexaploid wheat derivatives (SHWDs). Owing to this founding variability, one may infer that the genetic variances of native wild populations vs improved wheat may vary due to their differential origin and evolutionary history. In this study, we partitioned the additive variance of SHW and SHWD with respect to their breed origin by fitting a hierarchical Bayesian model with heterogeneous covariance structure for breeding values to estimate variance components for each breed category, and segregation variance. Two data sets were used to test the proposed hierarchical Bayesian model, one from a multi-year multi-location field trial of SHWD and the other comprising the two species of SHW. For the SHWD, the Bayesian estimates of additive variances of grain yield from each breed category were similar for T. turgidum and Ae. tauschii, but smaller for T. aestivum. Segregation variances between Ae. tauschii-T. aestivum and T. turgidum-T. aestivum populations explained a sizable proportion of the phenotypic variance. Bayesian additive variance components and the Best Linear Unbiased Predictors (BLUPs) estimated by two well-known software programs were similar for multi-breed origin and for the sum of the breeding values by origin for both data sets. Our results support the suitability of models with heterogeneous additive genetic variances to predict breeding values in wheat crosses with variable ploidy levels. SN - 1943-2631 UR - https://www.unboundmedicine.com/medline/citation/33724416/Additive_genetic_variance_and_covariance_between_relatives_in_synthetic_wheat_crosses_with_variable_parental_ploidy_levels_ L2 - https://academic.oup.com/genetics/article-lookup/doi/10.1093/genetics/iyaa048 DB - PRIME DP - Unbound Medicine ER -