Abstract
In order to increase genetic diversity in cereals, interspecific or even intergeneric crosses are worthwhile, especially wheat by rye crosses for triticale production. However, these crosses often fail due to inhibiting genes. To overcome this obstacle, crossability trait, present in a few wheat cultivars, can be transferred into other wheat lines of agronomical interest. Nevertheless, this transfer remains tedious through conventional backcrossing methods because it is a recessive trait, which requires selfing generations and complex evaluation by many crosses. Here, we present a marker-assisted backcrossing method to transfer this trait more quickly and easily. We chose to introduce the recessive crossability skr, located on chromosome 5BS and originating from Asian wheat, into Barok, a non-crossable French wheat cultivar, with good agronomic characteristics. Six molecular markers, close to the Skr locus, were used to check the transfer of the gene at each of the three backcrosses, without selfing generation nor crosses with rye. Finally, we crossed the predicted crossable lines with rye to validate their crossability. We obtained sixteen lines, morphologically similar to Barok, exhibiting high crossability rate (30%). The markers were thus efficient to transfer the skr crossability but they remain too far from the Skr locus to be considered as diagnostic markers. Indeed, genotyping and phenotyping on other wheat cultivars showed some discrepancies. Nevertheless, this opens the way to enhance genetic diversity more easily and to improve traits of agronomic interest in triticale or wheat as well as to study further barriers to intergeneric crosses.
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Abbreviations
- cv:
-
cultivar
- BC:
-
Back-Cross
- ISBP:
-
Insertion site-based polymorphism
- SSR:
-
Simple Sequence Repeat
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Communicated by L. Bona
This article was presented on the 9th International Triticale Symposium, May 23–27, 2016, in Szeged, Hungary.
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Bouguennec, A., Lesage, V.S., Gateau, I. et al. Transfer of Recessive skr Crossability Trait into Well-adapted French Wheat Cultivar Barok through Marker-assisted Backcrossing Method. CEREAL RESEARCH COMMUNICATIONS 46, 604–615 (2018). https://doi.org/10.1556/0806.46.2018.043
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DOI: https://doi.org/10.1556/0806.46.2018.043