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Article|01 Apr 2021|OPEN
Diversity and selection of the continuous-flowering gene, RoKSN, in rose
Emilie Araou1, Julien Jeauffre1, Tatiana Thouroude1, Annie Chastellier1, Gilles Michel1, Yuki Mikanagi2, Koji Kawamura3, Mark Banfield4, Cristiana Oghina-Pavie5, Jeremy Clotault1, Alix Pernet1, Vanessa Soufflet-Freslon1, & Fabrice Foucher1,
1Univ Angers, Institut Agro, INRAE, IRHS, SFR QUASAV, F-49000 Angers, France, 49071 Beaucouze, France
2Natural History Museum and Institute, Chiba, Japan
3Osaka Institute of Technology, Osaka, Japan
4Department of Biological Chemistry, John Innes Centre, Norwich Research Park, Norwich, UK
5Univ Angers, CNRS, TEMOS, SFR CONFLUENCES, Angers F-49000, France

Horticulture Research 8,
Article number: 76 (2021)
doi: 10.1038/hortres.2021.76
Views: 227

Received: 04 Nov 2020
Revised: 11 Jan 2021
Accepted: 01 Mar 2021
Published online: 01 Apr 2021

Abstract

Blooming seasonality is an important trait in ornamental plants and was selected by humans. Wild roses flower only in spring whereas most cultivated modern roses can flower continuously. This trait is explained by a mutation of a floral repressor gene, RoKSN, a TFL1homologue. In this work, we studied the origin, the diversity and the selection of the RoKSNgene. We analyzed 270 accessions, including wild and old cultivated Asian and European roses as well as modern roses. By sequencing the RoKSN gene, we proposed that the allele responsible for continuous-flowering, RoKSNcopia, originated from Chinese wild roses (Indicaesection), with a recent insertion of the copia element. Old cultivated Asian roses with the RoKSNcopia allele were introduced in Europe, and the RoKSNcopia allele was progressively selected during the 19th and 20th centuries, leading to continuous-flowering modern roses. Furthermore, we detected a new allele, RoKSNA181, leading to a weak reblooming. This allele encodes a functional floral repressor and is responsible for a moderate accumulation of RoKSNtranscripts. A transient selection of this RoKSNA181 allele was observed during the 19th century. Our work highlights the selection of different alleles at the RoKSN locus for recurrent blooming in rose.