Journal
PLANT CELL REPORTS
Volume 40, Issue 1, Pages 171-186Publisher
SPRINGER
DOI: 10.1007/s00299-020-02624-x
Keywords
DNA methylation; Gene action; Parent-of-origin; Reciprocal effect; Reciprocal hybrids; Solanum lycopersicum
Categories
Funding
- Agencia Nacional de Promocion Cientifica y Tecnologica [FONCyT PICT 2015-0424]
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET) [PIP2015-008, PUE0043]
- Universidad Nacional de Rosario (PID UNR AGR) [247]
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Reciprocal effects were found between tomato fruit quality and DNA methylation, indicating potential involvement of DNA methylation in parent-of-origin effects. Phenotypic differences were detected in the reciprocal hybrids, with the highest number of traits showing reciprocal effects in crosses between recombinant inbred lines.
Key message 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. 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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