Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 107, Issue 4, Pages 1494-1499Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0908283107
Keywords
F-1 pollen sterility; gene duplication; BDM incompatibility; mitochondrial ribosomal protein
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Funding
- Ministry of Agriculture, Forestry, and Fisheries of Japan [GD-2003, QTL-5002]
- Ministry of Education, Culture, Sports, Science, and Technology of Japan [18075006]
- Grants-in-Aid for Scientific Research [18075006] Funding Source: KAKEN
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Hybrid incompatibility in F-1 hybrids or later generations is often observed as sterility or inviability. This incompatibility acts as post-zygotic 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 F-1 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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