Dominance in self-compatibility between subgenomes of allopolyploid Arabidopsis kamchatica shown by transgenic restoration of self-incompatibility

Chow-Lih Yew, Takashi Tsuchimatsu, Rie Shimizu-Inatsugi, Shinsuke Yasuda, Masaomi Hatakeyama, Hiroyuki Kakui, Takuma Ohta, Keita Suwabe, Masao Watanabe, Seiji Takayama and Kentaro K. Shimizu ()
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Chow-Lih Yew: University of Zurich
Takashi Tsuchimatsu: University of Zurich
Rie Shimizu-Inatsugi: University of Zurich
Shinsuke Yasuda: Nara Institute of Science and Technology
Masaomi Hatakeyama: University of Zurich
Hiroyuki Kakui: University of Zurich
Takuma Ohta: Mie University
Keita Suwabe: Mie University
Masao Watanabe: Tohoku University
Seiji Takayama: Nara Institute of Science and Technology
Kentaro K. Shimizu: University of Zurich

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract The evolutionary transition to self-compatibility facilitates polyploid speciation. In Arabidopsis relatives, the self-incompatibility system is characterized by epigenetic dominance modifiers, among which small RNAs suppress the expression of a recessive SCR/SP11 haplogroup. Although the contribution of dominance to polyploid self-compatibility is speculated, little functional evidence has been reported. Here we employ transgenic techniques to the allotetraploid plant A. kamchatica. We find that when the dominant SCR-B is repaired by removing a transposable element insertion, self-incompatibility is restored. This suggests that SCR was responsible for the evolution of self-compatibility. By contrast, the reconstruction of recessive SCR-D cannot restore self-incompatibility. These data indicate that the insertion in SCR-B conferred dominant self-compatibility to A. kamchatica. Dominant self-compatibility supports the prediction that dominant mutations increasing selfing rate can pass through Haldane’s sieve against recessive mutations. The dominance regulation between subgenomes inherited from progenitors contrasts with previous studies on novel epigenetic mutations at polyploidization termed genome shock.

Date: 2023
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DOI: 10.1038/s41467-023-43275-2

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