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Pollen  sterility is one of the main hindrances against the utilization of strong  intersubspecific (indica-japonica) heterosis in rice. We looked  for neutral alleles at known pollen sterility loci Sd and Se that  could overcome this pollen sterility characteristic. Taichung 65, a typical japonica cultivar, and its near isogenic lines E7 and E8 for pollen sterility loci Sd and Se were employed as tester lines for crossing with 13 accessions  of wild rice (O. rufipogon). Pollen fertility and genotypic segregations  of the molecular markers tightly linked with Sd and Se loci were  analyzed in the paired F(1)s and F(2) populations.  One accession of wild rice (GZW054) had high pollen fertility in the paired F(1)s  between Taichung 65 and E7 or E8. Genotypic segregations of the molecular  markers tightly linked with Sd and Se loci fit the expected  Mendelian ratio (1:2:1), and non-significances were shown among the mean pollen  fertilities with the maternal, parental, and heterozygous genotypes of each  molecular markers tightly linked with Sd and Se loci.  Evidentially, it indicated that the alleles of Sd and Se loci for  GZW054 did not interact with those of Taichung 65 and its near isogenic lines,  and, thus were identified as neutral alleles Sd(n) and Se(n). These  neutral genes could become important germplasm resources for overcoming pollen  sterility in indica-japonica hybrids, making utilization of  strong heterosis in such hybrids viable.

Identification of neutral genes at pollen sterility loci Sd and Se of cultivated rice (Oryza sativa) with wild rice (O. rufipogon) origin