Mitochondrial gene in the nuclear genome induces reproductive barrier in rice

Hybrid incompatibility in F₁ hybrids or later generations is often observed as sterility or inviability. This incompatibility acts as postzygotic reproductive isolation, which results in the irreversible divergence of species. Here, we show that the reciprocal loss of duplicated genes encoding mitoc...

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Published inProceedings of the National Academy of Sciences - PNAS Vol. 107; no. 4; pp. 1494 - 1499
Main Authors Yamagata, Yoshiyuki, Yamamoto, Eiji, Aya, Kohichiro, Win, Khin Thanda, Doi, Kazuyuki, Sobrizal, Ito, Tomoko, Kanamori, Hiroyuki, Wu, Jianzhong, Matsumoto, Takashi, Matsuoka, Makoto, Ashikari, Motoyuki, Yoshimura, Atsushi
Format Journal Article
LanguageEnglish
Published United States National Academy of Sciences 26.01.2010
National Acad Sciences
Subjects
Alleles
Anthers
Biological Sciences
Cell Nucleus - genetics
gene duplication
Gene Expression Regulation, Plant
Genes, Mitochondrial
Genetic loci
Genetic Variation
Genome, Plant
Genomes
Genomics
Hybridity
hybrids
interspecific hybridization
Microscopy, Electron
mitochondria
mitochondrial DNA
Molecular Sequence Data
nuclear genome
nucleocytoplasmic interaction
Oryza
Oryza - genetics
Oryza - growth & development
Oryza - ultrastructure
Oryza glumaepatula
Oryza sativa
Plant Infertility
Plant reproduction
Plants
Pollen
Pollen - genetics
Pollen - growth & development
Pollen - ultrastructure
Polymerase chain reaction
Proteins
ribosomal proteins
Rice
sexual reproduction
wild relatives
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Summary:Hybrid incompatibility in F₁ hybrids or later generations is often observed as sterility or inviability. This incompatibility acts as postzygotic reproductive isolation, which results in the irreversible divergence of species. Here, we show that the reciprocal loss of duplicated genes encoding mitochondrial ribosomal protein L27 causes hybrid pollen sterility in F₁ hybrids of the cultivated rice Oryza sativa and its wild relative O. glumaepatula. Functional analysis revealed that this gene is essential for the later stage of pollen development, and distribution analysis suggests that the gene duplication occurred before the divergence of the AA genome species. On the basis of these results, we discuss the possible contribution of the "founder effect" in establishing this reproductive barrier.
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1Present address: Graduate School of Bioagricultural Sciences, Nagoya University, Furo, Chikusa, Nagoya, Aichi 464-8601, Japan.
2Present address: National Nuclear Energy Agency, Center for the Application of Isotopes and Radiation Technology, Jalan Lebak Bulus Raya, P.O. Box 7002, JKSL, Jakarta 12070, Indonesia.
Author contributions: Y.Y., M.A., and A.Y. designed research; Y.Y., E.Y., K.A., K.T.W., and K.D. performed research; S. and A.Y. developed the plant materials; T.I., H.K., J.W., and T.M. undertook the BAC clone analysis; M.M. provided advice on the experiments and writing; and Y.Y. and A.Y. wrote the paper.
Edited by Gurdev S. Khush, University of California, Davis, CA, and approved November 25, 2009 (received for review July 28, 2009)
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.0908283107