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Three genomes differentially contribute to the seedling lateral root number in allohexaploid wheat:Evidence from phenotype evolution and gene expression

Huifang Wang  Zhaorong Hu  Ke Huang  Yao Han  Aiju Zhao  Haiming Han  Long Song  Chaofeng Fan  Run Li  Mingming Xin  Huiru Peng  Yingyin Yao  Qixin Sun  Zhongfu Ni  
【摘要】:Common wheat is an allohexaploid(BBAADD) that originated from the hybridization and polyploidization of the diploid Aegilops tauschii(DD) with the allotetraploid Triticumturgidum(BBAA).Phenotypic changes often arise with the formation and evolution of allopolyploid wheat,but little is known about their evolution in different wheat species with varying ploidy levels.Here,we reported that the lateral root nvimber onthe primary root(LRNPR) of synthetic and natural allohexaploid wheats(BBAADD)is significantly higher than that of their allotetraploid(BBAA) and diploid progenitors(AA and SS) but much lower than that of their diploid progenitors(DD).The expression of the wheat gene TaLBD16,an orthologue of the Arabidopsis LATERAL ORGAN BOUNDARIES-DOMAIN 16/ASYMMETRIC LEAVES2-LIKE18(LBDI6),which is involved in lateral root development in Arabidopsis,was positively correlated with the LRNPR in diploid and allopolyploid wheats.In natural and synthetic allohexaploid wheats,the transcript of the TaLBD16 from the D genome(TaLBD16-D) was relatively more abundant compared to TaLBD16-Aand TaLBD16-B.Consistent with the observed variation in LRNPR,the divergence in the expression of TaLBD16 homoeologous genes occurred before the formation of polyploidy wheat.Collectively,our observations indicate that the D genome played a crucial role in the increased lateral root number of allohexaploid wheats compared to their allotetraploid progenitors,and TaLBD16-D was one of the key genes involved in the formation of lateral root number during wheat evolution.

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