New Hybrid Spikelet Sterility Gene Found in Interspecific Cross between Oryza sativa and O. meridionalis

Various kinds of reproductive barriers have been reported in intraspecific and interspecific crosses between the AA genome species, to which Asian rice ( ) and African rice ( ) belong. A hybrid seed sterility phenomenon was found in the progeny of the cross between and , which is found in Northern A...

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Bibliographic Details
Published in:Plants (Basel) 2022-01, Vol.11 (3), p.378
Main Authors: Ichitani, Katsuyuki, Toyomoto, Daiki, Uemura, Masato, Monda, Kentaro, Ichikawa, Makoto, Henry, Robert, Sato, Tadashi, Taura, Satoru, Ishikawa, Ryuji
Format: Article
Language:English
Subjects:
Alleles
Chromosome 1
egg-killer
Eggs
Fertility
Genes
Genetic crosses
Genomes
Genotype & phenotype
Heterozygotes
hybrid sterility
Hypotheses
Interspecific hybridization
Linkage analysis
O. meridionalis
O. sativa
Oryza glaberrima
Oryza meridionalis
Oryza sativa
Population genetics
Populations
Progeny
reproductive barrier
Rice
Seeds
Sterility
wild rice
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Summary:Various kinds of reproductive barriers have been reported in intraspecific and interspecific crosses between the AA genome species, to which Asian rice ( ) and African rice ( ) belong. A hybrid seed sterility phenomenon was found in the progeny of the cross between and , which is found in Northern Australia and Indonesia and has diverged from the other AA genome species. This phenomenon could be explained by an egg-killer model. Linkage analysis using DNA markers showed that the causal gene was located on the distal end of chromosome 1. Because no known egg-killer gene was located in that chromosomal region, this gene was named (abbreviated form, ). In heterozygotes, the eggs carrying the allele are killed, causing semi-sterility. This killer system works incompletely: some eggs carrying the allele survive and can be fertilized. The distribution of alleles in wild populations of was discussed from the perspective of genetic differentiation of populations.
ISSN:2223-7747
2223-7747
DOI:10.3390/plants11030378