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Oryza glumaepatula originates from South America continent and contains many valuable traits, such as tolerance to abiotic stress, high yield and good cooking qualities. However, hybrid sterility severely hindered the utilization of favorable genes of O. glumaepatula by interspecific hybridization. In order to further understand the nature of hybrid sterility between O. sativa and O. glumaepatula , a near isogenic line (NIL) was developed using a japonica variety Dianjingyou 1 as the recurrent parent and an accession of O. glumaepatula as the donor parent. A novel gene S56 (t) for pollen sterility was mapped into the region between RM20797 and RM1093 on the short arm of chromosome 7, the physical distance between the two markers was about 469 kb. The genetic behavior of S56 (t) followed one-locus allelic interaction model, the male gametes carrying the alleles of O. sativa in the heterozygotes were aborted completely. These results would help us clone S56 (t) gene and understand the role of S56 (t) in interspecific sterility.

breeding science

Mapping of &lt;i&gt;S56&lt;/i&gt;(t) responsible for interspecific hybrid sterility between &lt;i&gt;Oryza sativa&lt;/i&gt; and &lt;i&gt;Oryza glumaepatula&lt;/i&gt;