Development of near-isogenic lines for shattering habit by crossing japonica rice cultivars with different grain-shattering traits and the genetic analysis of the shattering habit
2017
Okubo, K. (Res. Inst. for Agric., Okayama Pref. Tech. Cent. Agric. Forest. Fish., Akaiwa (Japan)) | Inoue, C. | Tsujimura, Y. | Ishikawa, R.
Easy-shattering habit of the rice plant increases head loss in the Japanese head-feeding combine harvester, while the non-shattering habit increases processing loss in the conventional combine harvester. Thus, the performance of combine harvesters depends on the grain-shattering trait of the rice plant. To evaluate the effects of the grain-shattering trait on various losses at combine harvesting, we developed pairs of near-isogenic lines (NILs) for shattering habit by the selfing method. The NILs were derived from a cross between japonica rice cultivars, namely, 'Asahi' and 'Setokogane'; 'Asahi' has an easily shattering habit, while 'Setokogane' has a hard-to-shatter habit. We developed eleven pairs of NILs. Alleles at qSH1 locus were found to be associated with either easily shattering or hard-to-shatter in the pairs of NILs. Grain-shattering habits of eleven hard-to-shatter lines were not significantly different from each other, but, those of some easily shattering lines were significantly different. This shows that the genetic background affected the grain-shattering degree in the lines with shattering. These data suggest that additional loci with minor effects on the grain-shattering habit may exist in the cross between 'Asahi' and 'Setokogane'. Additionally, the non-functional allele at qSH1 which involves the hard-to-shatter habit, may behave epistatic to other loci. Thus, the NILs would be used to conveniently evaluate the effects of the grain-shattering trait on various losses at combine harvesting and the genetic analysis of grain-shattering in japonica rice.
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