Multiple loci and genetic interactions involving flowering time genes regulate stem branching among natural variants of Arabidopsis

被引:39
作者
Huang, Xueqing [1 ,2 ]
Ding, Jia [2 ]
Effgen, Sigi [2 ]
Turck, Franziska [3 ]
Koornneef, Maarten [4 ]
机构
[1] Fudan Univ, Sch Life Sci, Inst Plant Biol, State Key Lab Genet Engn, Shanghai 200433, Peoples R China
[2] Max Planck Inst Plant Breeding Res, Dept Plant Breeding & Genet, D-50829 Cologne, Germany
[3] Max Planck Inst Plant Breeding Res, Dept Plant Dev Biol, D-50829 Cologne, Germany
[4] Wageningen Univ, Genet Lab, NL-6708 PE Wageningen, Netherlands
关键词
axillary meristems; epistasis; flowering time; natural variation; QTL analysis; QUANTITATIVE TRAIT LOCI; INBRED LINE POPULATIONS; ALLELIC VARIATION; INFLORESCENCE DEVELOPMENT; SHOOT; THALIANA; MERISTEM; ASSOCIATIONS; CYTOKININ; REVEALS;
D O I
10.1111/nph.12306
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Shoot branching is a major determinant of plant architecture. Genetic variants for reduced stem branching in the axils of cauline leaves of Arabidopsis were found in some natural accessions and also at low frequency in the progeny of multiparent crosses. Detailed genetic analysis using segregating populations derived from backcrosses with the parental lines and bulked segregant analysis was used to identify the allelic variation controlling reduced stem branching. Eight quantitative trait loci (QTLs) contributing to natural variation for reduced stem branching were identified (REDUCED STEM BRANCHING 1-8 (RSB1-8)). Genetic analysis showed that RSB6 and RSB7, corresponding to flowering time genes FLOWERING LOCUS C (FLC) and FRIGIDA (FRI), epistatically regulate stem branching. Furthermore, FLOWERING LOCUS T (FT), which corresponds to RSB8 as demonstrated by fine-mapping, transgenic complementation and expression analysis, caused pleiotropic effects not only on flowering time, but, in the specific background of active FRI and FLC alleles, also on the RSB trait. The consequence of allelic variation only expressed in late-flowering genotypes revealed novel and thus far unsuspected roles of several genes well characterized for their roles in flowering time control.
引用
收藏
页码:843 / 857
页数:15
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