Background
Oryza glumaepatula
represents an important resource of genetic diversity that can be used to improve rice production. However, hybrid sterility severely restricts gene flow between
Oryza
species, and hinders the utilization of distant heterosis in hybrid rice breeding.
Results
In order to fully exploit the beneficial genes of
O. glumaepatula
and facilitate the conservation of these gene resources, a set of chromosome single-segment substitution lines (SSSLs) was developed using an
indica
variety HJX74 as the recurrent parent and an accession of
O. glumaepatula
as the donor parent. During the process of SSSLs development,
S23
, a locus conferring hybrid male sterility between
O. sativa
and
O. glumaepatula
, was identified and fine mapped to 11.54 kb and 7.08 kb genomic region in
O. sativa
and
O. glumaepatula
, respectively, encoding three and two candidate ORFs, respectively. qRT-PCR and sequence analysis excluded one common
ORF
as the candidate gene. In addition, hybrid male sterility caused by
S23
was environment-sensitive, and could be observed only in natural short-day (NSD).
Conclusion
Identification and candidate genes analysis of
S23
in this study provides a valuable example to study the crosstalk between interspecific F
1
hybrid male sterility and environment-conditioned male sterility in rice, facilitates reserving and utilizing favorable genes or alleles of wild
Oryza
species, and allows for a more efficient exploitation of distant heterosis in hybrid rice breeding.
Electronic supplementary material
The online version of this article (10.1186/s12284-019-0271-4) contains supplementary material, which is available to authorized users.
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