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Presence versus absence of CYP734A50 underlies the style-length dimorphism in primroses.

ABSTRACT: Heterostyly is a wide-spread floral adaptation to promote outbreeding, yet its genetic basis and evolutionary origin remain poorly understood. In Primula (primroses), heterostyly is controlled by the S-locus supergene that determines the reciprocal arrangement of reproductive organs and incompatibility between the two morphs. However, the identities of the component genes remain unknown. Here, we identify the Primula CYP734A50 gene, encoding a putative brassinosteroid-degrading enzyme, as the G locus that determines the style-length dimorphism. CYP734A50 is only present on the short-styled S-morph haplotype, it is specifically expressed in S-morph styles, and its loss or inactivation leads to long styles. The gene arose by a duplication specific to the Primulaceae lineage and shows an accelerated rate of molecular evolution. Thus, our results provide a mechanistic explanation for the Primula style-length dimorphism and begin to shed light on the evolution of the S-locus as a prime model for a complex plant supergene.

SUBMITTER: Huu CN

PROVIDER: S-EPMC5012859 | biostudies-literature | 2016 Sep

REPOSITORIES: biostudies-literature

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Presence versus absence of CYP734A50 underlies the style-length dimorphism in primroses.

Huu Cuong Nguyen CN Kappel Christian C Keller Barbara B Sicard Adrien A Takebayashi Yumiko Y Breuninger Holger H Nowak Michael D MD Bäurle Isabel I Himmelbach Axel A Burkart Michael M Ebbing-Lohaus Thomas T Sakakibara Hitoshi H Altschmied Lothar L Conti Elena E Lenhard Michael M

eLife 20160906

Heterostyly is a wide-spread floral adaptation to promote outbreeding, yet its genetic basis and evolutionary origin remain poorly understood. In Primula (primroses), heterostyly is controlled by the S-locus supergene that determines the reciprocal arrangement of reproductive organs and incompatibility between the two morphs. However, the identities of the component genes remain unknown. Here, we identify the Primula CYP734A50 gene, encoding a putative brassinosteroid-degrading enzyme, as the G ...[more]

PMID: 27596932

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Presence versus absence of CYP734A50 underlies the style-length dimorphism in primroses.

Publications

Presence versus absence of CYP734A50 underlies the style-length dimorphism in primroses.

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