ArticleTAG. Theoretical and applied genetics. Theoretische und angewandte Genetik2025
Chromosomal structural variation loci HSS1 and HSS6 lead to hybrid sterility in rice.
Article in TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
key messageChromosomal structural variation leads to rice hybrid sterility, and this study has established a new inheritance model and offers a novel insight into hybrid sterility in rice. The utilization of heterosis among different species significantly enhances rice yield. However, the direct application of this advantage is hindered by hybrid sterility (HS). Here we identify a stable semi-sterile inbred line (SSIL) in the hybridization between rice species O. sativa indica and wild rice O. longistaminata. Both pollen and spikelet fertility in heterozygous SSIL plants are semi-sterile, and the homozygous plants show normal fertility. Interestingly, unlike previously reported hybrid sterility loci, SSIL does not induce segregation distortion in progeny. The genotypes of chromosome 1 (Chr.1) exhibit tight pseudo-linkage on Chr.6 in SSIL population. HSS1 and HSS6 are named as the two loci of Chr.1 and Chr.6. Cytological observations revealed abnormalities in male and female gametes during meiosis, ultimately resulting in semi-sterile pollen and spikelet. HSS1 was narrowed down to a 190.6-kb interval and HSS6 to a 1391.6-kb region using an SSIL population of 10,393 plants. Through high-throughput sequencing and observation of chromosomal behavior during meiosis, a reciprocal translocation between the short arm of Chr.1 and the end of Chr.6 in the translocated RD23-type (R
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