Two Loci Contribute Epistastically to Heterospecific Pollen Rejection, a Postmating Isolating Barrier Between Species

G3 : Genes - Genomes - Genetics
Jennafer A P HamlinLeonie C Moyle

Abstract

Recognition and rejection of heterospecific male gametes occurs in a broad range of taxa, although the complexity of mechanisms underlying these components of postmating cryptic female choice is poorly understood. In plants, the arena for postmating interactions is the female reproductive tract (pistil), within which heterospecific pollen tube growth can be arrested via active molecular recognition and rejection. Unilateral incompatibility (UI) is one such postmating barrier in which pollen arrest occurs in only one direction of an interspecific cross. We investigated the genetic basis of pistil-side UI between Solanum species, with the specific goal of understanding the role and magnitude of epistasis between UI QTL. Using heterospecific introgression lines (ILs) between Solanum pennellii and S. lycopersicum, we assessed the individual and pairwise effects of three chromosomal regions (ui1.1, ui3.1, and ui12.1) previously associated with interspecific UI among Solanum species. Specifically, we generated double introgression ('pyramided') genotypes that combined ui12.1 with each of ui1.1 and ui3.1, and assessed the strength of UI pollen rejection in the pyramided lines, compared to single introgression genotypes. We found that ...Continue Reading

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Citations

Jul 20, 2019·The Plant Journal : for Cell and Molecular Biology·Roger T ChetelatRicardo Pertuzé
Sep 11, 2019·Annual Review of Genetics·Lila Fishman, Mariah McIntosh
Apr 22, 2020·Evolution Letters·Jennafer A P HamlinLeonie C Moyle
Feb 13, 2021·Plant Physiology·Xiaoqiong Qin, Roger T Chetelat
Jun 19, 2021·Annual Review of Plant Biology·Amanda K Broz, Patricia A Bedinger

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Datasets Mentioned

BETA
LA0716
LA3475

Methods Mentioned

BETA
genotyping
PCR

Software Mentioned

RStudio
ImageJ
AutoStitch

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