Abstract
Segregation distortion of molecular markers is closely related to hybrid incompatibility in progeny from intraspecific crosses. Recent reports in higher plants have demonstrated that hybrid sterility results in segregation distortion at the causal gene regions in progeny of intraspecific crosses. Ne1 and Ne2 complementary loci are known to control hybrid necrosis in intraspecific crosses of common wheat cultivars. Here, we examine the effect of a weak necrosis allele Ne1 w on the segregation ratio of molecular markers in recombinant inbred lines (RILs) of common wheat. Some RILs showed accelerated cell death in the leaves at the heading stage due to the epistatic interaction between two quantitative trait loci (QTL) on chromosomes 5B and 2B. Chromosomal localization of these QTL corresponding to Ne1 w and Ne2 showed distorted segregation ratios of assigned markers having oppositely biased direction. Although the Ne1 w and Ne2 interaction had no obvious effect on seed fertility, Ne1 w reduced completion of grain development under the Ne2-homozygous background. This reduction might be one of causes that induces segregation distortion in the 5B and 2B chromosomal regions of RILs. The present study demonstrated that weak hybrid necrosis has limited phenotypic effects; it causes segregation distortion in progeny from intraspecific crosses.
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Acknowledgments
The authors thank emeritus professor Dr. Koichiro Tsunewaki for helpful discussion and supplying seeds of cultivars Ne1-S615 and Ne2-S615. This work was supported by Grants-in-Aid for Scientific Research (B) No. 21380005 and No. 25292008 to ST from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan.
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Takumi, S., Motomura, Y., Iehisa, J.C.M. et al. Segregation distortion caused by weak hybrid necrosis in recombinant inbred lines of common wheat. Genetica 141, 463–470 (2013). https://doi.org/10.1007/s10709-013-9745-2
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DOI: https://doi.org/10.1007/s10709-013-9745-2