Significant segregation of spikelet fertility occurred in an F2 population derived from a spikelet fertility-normal F1 hybrid produced by a cross between ‘Palawan’, a japonica variety, and ‘IR42’, an indica variety. To identify factors controlling the fertility segregation, we used 104 RFLP markers covering all 12 rice chromosomes to investigate the association of spikelet fertility and marker segregation. We found that the segregation of two sets of gene pairs was significantly (P < 0.001) associated with fertility segregation. The first pair of genes was linked to RFLP marker RG778 on chromosome 12 and RFLP markers RG690/RG369 on chromosome 1. A significant reduction in fertility was observed when the plants were homozygote at RG778 with the indica allele as well as homozygote at RG690/RG369 with the japonica allele. The second pair of genes was linked to RG218 on chromosome 12 and RG650 on chromosome 7, respectively. The recombinant homozygote at these two loci showed a significant reduction on spikelet fertility. The non-allelic interaction effect was further modified by a gene linked to RG778, resulting in even lower fertility. The results of this study provides the first evidence of chromosomal localization of sporophytic sterility genes whose interaction can result in a reduction of spikelet fertility in the F2 derived from fertility-normal F1.
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Wu, P., Zhang, G., Huang, N. et al. Non-allelic interaction conditioning spikelet sterility in an F2 population of indica/japonica cross in rice. Theoret. Appl. Genetics 91, 825–829 (1995). https://doi.org/10.1007/BF00223887
- Oryza sativa L
- Spikelet fertility
- Non-allelic interaction
- Restriction fragment length polymorphism (RFLP)