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A stigmatic gene confers interspecies incompatibility in the Brassicaceae


Fujii, Sota; Tsuchimatsu, Takashi; Kimura, Yuka; Ishida, Shota; Tangpranomkorn, Surachat; Shimosato-Asano, Hiroko; Iwano, Megumi; Furukawa, Shoko; Itoyama, Wakana; Wada, Yuko; Shimizu, Kentaro K; Takayama, Seiji (2019). A stigmatic gene confers interspecies incompatibility in the Brassicaceae. Nature Plants, 5:731-741.

Abstract

Pre-zygotic interspecies incompatibility in angiosperms is a male–female relationship that inhibits the formation of hybrids between two species. Here, we report on the identification of STIGMATIC PRIVACY 1 (SPRI1), an interspecies barrier gene in Arabidopsis thaliana. We show that the rejection activity of this stigma-specific plasma membrane protein is effective against distantly related Brassicaceae pollen tubes and is independent of self-incompatibility. Point-mutation experiments and functional tests of synthesized hypothetical ancestral forms of SPRI1 suggest evolutionary decay of SPRI1-controlled interspecies incompatibility in self-compatible A. thaliana. Hetero-pollination experiments indicate that SPRI1 ensures intraspecific fertilization in the pistil when pollen from other species are present. Our study supports the idea that SPRI1 functions as a barrier mechanism that permits entrance of pollen with an intrinsic signal from self species.

Abstract

Pre-zygotic interspecies incompatibility in angiosperms is a male–female relationship that inhibits the formation of hybrids between two species. Here, we report on the identification of STIGMATIC PRIVACY 1 (SPRI1), an interspecies barrier gene in Arabidopsis thaliana. We show that the rejection activity of this stigma-specific plasma membrane protein is effective against distantly related Brassicaceae pollen tubes and is independent of self-incompatibility. Point-mutation experiments and functional tests of synthesized hypothetical ancestral forms of SPRI1 suggest evolutionary decay of SPRI1-controlled interspecies incompatibility in self-compatible A. thaliana. Hetero-pollination experiments indicate that SPRI1 ensures intraspecific fertilization in the pistil when pollen from other species are present. Our study supports the idea that SPRI1 functions as a barrier mechanism that permits entrance of pollen with an intrinsic signal from self species.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Evolutionary Biology and Environmental Studies
Dewey Decimal Classification:570 Life sciences; biology
590 Animals (Zoology)
Scopus Subject Areas:Life Sciences > Plant Science
Language:English
Date:1 July 2019
Deposited On:25 Jul 2019 12:21
Last Modified:29 Jul 2020 10:58
Publisher:Nature Publishing Group
ISSN:2055-026X
OA Status:Closed
Publisher DOI:https://doi.org/10.1038/s41477-019-0444-6

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