Exome sequencing of bulked segregants identified a novel TaMKK3-A allele linked to the wheat ERA8 ABA-hypersensitive germination phenotype
Exome sequencing of bulked segregants identified a novel TaMKK3-A allele linked to the wheat ERA8 ABA-hypersensitive germination phenotype
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大量分离子的外显子组测序鉴定出与小麦 ERA8 ABA 超敏感发芽表型相关的新型 TaMKK3-A 等位基因
DOI:
10.1101/784652
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Martinez S
中科院分区:
文献类型:
--
作者:
Martinez S
Key messageUsing bulked segregant analysis of exome sequence, we fine-mapped the ABA-hypersensitive mutantERA8in a wheat backcross population to theTaMKK3-Alocus of chromosome 4A.AbstractPreharvest sprouting (PHS) is the germination of mature grain on the mother plant when it rains before harvest. TheENHANCED RESPONSE TO ABA8(ERA8) mutant increases seed dormancy and, consequently, PHS tolerance in soft white wheat ‘Zak.’ERA8was mapped to chromosome 4A in a Zak/‘ZakERA8’ backcross population using bulked segregant analysis of exome sequenced DNA (BSA-exome-seq).ERA8was fine-mapped relative to mutagen-induced SNPs to a 4.6 Mb region containing 70 genes. In the backcross population, theERA8ABA-hypersensitive phenotype was strongly linked to a missense mutation inTaMKK3-A-G1093A(LOD 16.5), a gene associated with natural PHS tolerance in barley and wheat. The map position ofERA8was confirmed in an ‘Otis’/ZakERA8but not in a ‘Louise’/ZakERA8mapping population. This is likely because Otis carries the same natural PHS susceptibleMKK3-A-A660Sallele as Zak, whereas Louise carries the PHS-tolerantMKK3-A-C660Rallele. Thus, the variation for grain dormancy and PHS tolerance in the Louise/ZakERA8population likely resulted from segregation of other loci rather than segregation for PHS tolerance at theMKK3locus. This inadvertent complementation test suggests that theMKK3-A-G1093Amutation causes theERA8phenotype. Moreover,MKK3was a known ABA signaling gene in the 70-gene 4.6 MbERA8interval. None of these 70 genes showed the differential regulation in wild-type Zak versusERA8expected of a promoter mutation. Thus, the working model is that theERA8phenotype results from theMKK3-A-G1093Amutation.
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影响因子:
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作者:
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通讯作者:
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DOI:
--
发表时间:
1989
期刊:
影响因子:
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作者:
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通讯作者:
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DOI:
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发表时间:
2006
期刊:
影响因子:
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