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FRIZZY PANICLE drives supernumerary spikelets in bread wheat
Oxana Dobrovolskaya1, Caroline Pont2, Richard Sibout2
1Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia (O.D., Y.L.O., E.S., L.L.);Institut National de la Recherche Agronomique-Université Blaise Pascal Unité Mixte de Recherche-1095, 63100 Clermont-Ferrand cedex 2, France (Ca.P., F.M., A.C., V.G., Ch.P., J.S.);Institut National de la Recherche Agronomique, Unité Mixte de Recherche-1318, Institut Jean-Pierre Bourgin, Saclay Plant Sciences, F-78000 Versailles, France (R.S.); AgroParisTech, Institut Jean-Pierre Bourgin, RD10, F-78000 Versailles, France (R.S.);Agrotest Fyto, Ltd., 767 01 Kromeriz, Czech Republic (P.M.);Vavilov Institute of General Genetics, Russian Academy of Sciences, 3119333 Moscow, Russia (E.B.);College of Agriculture, Ibaraki University, 3-21-1 Chuuo, Ami, Inashiki, Ibaraki 300-0393, Japan (N.W.);Institut National de la Recherche Agronomique, Centre National de Ressources Génomiques Végétales, 31326 Castanet Tolosan cedex, France (E.P., N.G., H.B.);Novosibirsk State University, 630090 Novosibirsk, Russia (Y.O.); andCentral Siberian Botanical Garden, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia (A.A.K.) oxanad@bionet.nsc.ru jsalse@clermont.inra.fr.
Abstract:
Bread wheat (Triticum aestivum) inflorescences, or spikes, are characteristically unbranched and normally bear one spikelet per rachis node. Wheat mutants on which supernumerary spikelets (SSs) develop are particularly useful resources for work towards understanding the genetic mechanisms underlying wheat inflorescence architecture and, ultimately, yield components. Here, we report the characterization of genetically unrelated mutants leading to the identification of the wheat FRIZZY PANICLE (FZP) gene, encoding a member of the APETALA2/Ethylene Response Factor transcription factor family, which drives the SS trait in bread wheat. Structural and functional characterization of the three wheat FZP homoeologous genes (WFZP) revealed that coding mutations of WFZP-D cause the SS phenotype, with the most severe effect when WFZP-D lesions are combined with a frameshift mutation in WFZP-A. We provide WFZP-based resources that may be useful for genetic manipulations with the aim of improving bread wheat yield by increasing grain number.
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