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Fruit quality and DNA methylation are affected by parental order in reciprocal crosses of tomato

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Abstract

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Reciprocal effects were found for tomato fruit quality and DNA methylation. The epigenetic identity of reciprocal hybrids indicates that DNA methylation might be one of the mechanisms involved in POEs.

Abstract

Crosses between different genotypes and even between different species are commonly used in plant breeding programs. Reciprocal hybrids are obtained by changing the cross direction (or the sexual role) of parental genotypes in a cross. Phenotypic differences between these hybrids constitute reciprocal effects (REs). The aim of this study was to evaluate phenotypic differences in tomato fruit traits and DNA methylation profiles in three inter- and intraspecific reciprocal crosses. REs were detected for 13 of the 16 fruit traits analyzed. The number of traits with REs was the lowest in the interspecific cross, whereas the highest was found in the cross between recombinant inbred lines (RILs) derived from the same interspecific cross. An extension of gene action analysis was proposed to incorporate parent-of-origin effects (POEs). Maternal and paternal dominance were found in four fruit traits. REs and paternal inheritance were found for epiloci located at coding and non-coding regions. The epigenetic identity displayed by the reciprocal hybrids accounts for the phenotypic differences among them, indicating that DNA methylation might be one of the mechanisms involved in POEs.

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Data availability

The datasets generated and analyzed in the study are available in the GenBank repository, https://www.ncbi.nlm.nih.gov/nucleotide/ and IDs are provided in the manuscript.

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Acknowledgements

We thank the Tomato Genetic Resources Center, University of California, Davis, California, USA for kindly providing seeds of the wild accession LA0722 of S. pimpinellifolium and Estación Experimental Agropecuaria—Instituto Nacional de Tecnología Agropecuaria Cerrillos, Salta, Argentina for kindly providing seeds of the ‘Caimanta’ cultivar. We thank Dra. Liliana Picardi for her valuable comments. We thank Gabriela Venturi for her careful revision of the English manuscript and valuable comments.

Funding

This work was supported by the Agencia Nacional de Promoción Científica y Tecnológica (FONCyT PICT 2015-0424), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET PIP2015-008 and PUE0043), and Universidad Nacional de Rosario (PID UNR AGR 247).

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MDG conceptualization, investigation, methodology, formal analysis, writing—original draft. DVV investigation, formal analysis, writing—review and editing. FT investigation, formal analysis, writing—review and editing. VC formal analysis, writing—review and editing. GRR conceptualization, investigation, methodology, formal analysis, funding acquisition, writing—original draft.

Corresponding author

Correspondence to Gustavo Rubén Rodríguez.

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Communicated by Neal Stewart.

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Gimenez, M.D., Vazquez, D.V., Trepat, F. et al. Fruit quality and DNA methylation are affected by parental order in reciprocal crosses of tomato. Plant Cell Rep 40, 171–186 (2021). https://doi.org/10.1007/s00299-020-02624-x

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  • DOI: https://doi.org/10.1007/s00299-020-02624-x

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