Study conducted on diversity and selection of the continuous-flowering gene, RoKSN, in rose

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 TFL1 homologue. In this work, the researchers studied the origin, the diversity and the selection of the RoKSN gene.

270 accessions were analyzed, including wild and old cultivated Asian and European roses as well as modern roses. By sequencing the RoKSN gene, they proposed that the allele responsible for continuous-flowering, RoKSNcopia, originated from Chinese wild roses (Indicae section), 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, they 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 RoKSN transcripts. A transient selection of this RoKSNA181 allele was observed during the 19th century. This work highlights the selection of different alleles at the RoKSN locus for recurrent blooming in rose.

The study is conducted by Vanessa Soufflet-Freslon, Emilie Araou, Julien Jeauffre,TatianaThouroude, Annie Chastellier, Gilles Michel,
Yuki Mikanagi, Koji Kawamura,MarkBanfield, Cristiana Oghina-Pavie,JérémyClotault, Alix Pernet and Fabrice Foucher.

To read the complete study, go to www.researchgate.net.


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