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Floral color evolution in Petunia demonstrates that complex traits can be regained. A single mutation restored the AN2 gene, reintroducing purple pigmentation and highlighting its role in speciation.

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Area of Science:

  • Evolutionary Biology
  • Plant Genetics
  • Molecular Evolution

Background:

  • Phenotypic evolution and reversibility are key questions in biology.
  • Floral pigmentation loss is common in angiosperms, but color regain is rare.
  • The R2R3-MYB transcription factor AN2 influences floral color and pollinator preference in Petunia.

Purpose of the Study:

  • Investigate the mechanism of floral color regain in Petunia.
  • Determine the role of AN2 in the re-evolution of floral pigmentation.
  • Explore AN2's function as a potential speciation gene.

Main Methods:

  • Comparative genomics analysis of AN2 in Petunia species.
  • Identification of mutations affecting AN2 function.
  • Functional characterization of AN2 variants.

Main Results:

  • Described the independent re-gain of floral color in Petunia secreta.
  • Identified a single reading-frame-restoring mutation in AN2 responsible for color restoration.
  • Demonstrated AN2's crucial role in floral color transitions and pollinator shifts.

Conclusions:

  • Floral color evolution in Petunia is mechanistically linked to AN2 functionality.
  • AN2 acts as a hotspot for color transitions and a driver of speciation.
  • Phenotypic transitions, including color regain, are possible through specific genetic mechanisms.