The genetic basis of cytoplasmic male sterility and fertility restoration in wheat

Joanna Melonek, Jorge Duarte, Jerome Martin, Laurent Beuf, Alain Murigneux, Pierrick Varenne, Jordi Comadran, Sebastien Specel, Sylvain Levadoux, Kalia Bernath-Levin, François Torney, Jean-Philippe Pichon, Pascual Perez and Ian Small ()
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Joanna Melonek: The University of Western Australia
Jorge Duarte: Groupe Limagrain, Centre de Recherche, Route d’Ennezat
Jerome Martin: Groupe Limagrain, Centre de Recherche, Route d’Ennezat
Laurent Beuf: Groupe Limagrain, Centre de Recherche, Route d’Ennezat
Alain Murigneux: Groupe Limagrain, Centre de Recherche, Route d’Ennezat
Pierrick Varenne: Groupe Limagrain, Centre de Recherche, Route d’Ennezat
Jordi Comadran: Groupe Limagrain, Centre de Recherche, Route d’Ennezat
Sebastien Specel: Groupe Limagrain, Centre de Recherche, Route d’Ennezat
Sylvain Levadoux: Groupe Limagrain, Centre de Recherche, Route d’Ennezat
Kalia Bernath-Levin: The University of Western Australia
François Torney: Groupe Limagrain, Centre de Recherche, Route d’Ennezat
Jean-Philippe Pichon: Groupe Limagrain, Centre de Recherche, Route d’Ennezat
Pascual Perez: Groupe Limagrain, Centre de Recherche, Route d’Ennezat
Ian Small: The University of Western Australia

Nature Communications, 2021, vol. 12, issue 1, 1-14

Abstract: Abstract Hybrid wheat varieties give higher yields than conventional lines but are difficult to produce due to a lack of effective control of male fertility in breeding lines. One promising system involves the Rf1 and Rf3 genes that restore fertility of wheat plants carrying Triticum timopheevii-type cytoplasmic male sterility (T-CMS). Here, by genetic mapping and comparative sequence analyses, we identify Rf1 and Rf3 candidates that can restore normal pollen production in transgenic wheat plants carrying T-CMS. We show that Rf1 and Rf3 bind to the mitochondrial orf279 transcript and induce cleavage, preventing expression of the CMS trait. The identification of restorer genes in wheat is an important step towards the development of hybrid wheat varieties based on a CMS-Rf system. The characterisation of their mode of action brings insights into the molecular basis of CMS and fertility restoration in plants.

Date: 2021
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DOI: 10.1038/s41467-021-21225-0

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