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Abstract Detail

Hybrids and Hybridization

Granados Mendoza, Carolina [1], Wanke, Stefan [2], Salomo, Karsten [2], Goetghebeur, Paul [1], Samain, Marie-Stéphanie [1].

Facilitating wide hybridization in Hydrangea s. l. cultivars: a phylogenetic and marker-assisted breeding approach.

Hydrangea s. l., belonging to the upscale market segment of ornamental cultivars, currently faces a renaissance in horticulture. Hence, novel molecular-assisted breeding approaches are timely. Wide hybridization, i.e. crosses between distantly related species, has shown to be problematic. Recent studies have considerably improved our knowledge of the phylogenetic relationships between the ornamental Hydrangea s. l. species. Based on an extensive marker selection including 13 highly variable chloroplast markers, a fully resolved and highly supported phylogenetic tree is currently available. This robust phylogenetic framework includes the majority of widely cultivated Hydrangea s. l. species that have been the center of attention in a number of crossing projects. The present study is based on this highly supported phylogenetic hypothesis. Here we aim to guide the selection of the best candidates for future successful breeding projects, involving interspecific crosses of both closely and distantly related Hydrangeas. l. lineages. Therefore, we integrated the phylogenetic relatedness of potential parental lines along with genetic distances calculated from a wide plastid marker selection. Direct crosses between two species were found to be successful up to an average genetic distance of 0.01065, while failure can be expected at an average genetic distance of 0.01385 and higher. In order to overcome this genetic distance threshold, we propose Hydrangea arborescens, H. sargentiana, H. integrifolia, and H. seemannii as the best candidates for future bridge-cross projects with currently available fertile hybrids. We expect that our results will allow breeders to overcome long-standing wide crossing difficulties and motivate breeding initiatives of potential economic value.

Broader Impacts:

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Related Links:
Research Group Spermatophytes. Hydrangeaceae research

1 - Ghent University, Department of Biology, Research Group Spermatophytes, K.L. Ledeganckstraat 35, Gent, 9000, Belgium
2 - Technische Universität Dresden, Department of Biology, Institut für Botanik, Zellescher Weg 20b, Dresden, 01062, Germany

Chloroplast markers
Interspecific hybridization
Bridge-cross breeding
Genetic distances.

Presentation Type: Oral Paper:Papers for Topics
Session: 22
Location: Rosedown/Riverside Hilton
Date: Tuesday, July 30th, 2013
Time: 9:00 AM
Number: 22001
Abstract ID:69
Candidate for Awards:Margaret Menzel Award

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