The four genes displayed lower expression levels in all tested tissues and organs of the columnar cultivar than in the other three cultivars, while expression levels of MdoTAC1a and MdoTAC1b in shoot tips and vegetative buds were highest in the standard cultivar, followed by spur, tip bearing, and columnar cultivars in decreasing order. There was no difference in the coding sequences of each gene in the four cultivars, but several mutated sites were found in their promoters. In addition, MdoLAZY1 and MdoLAZY2 contain a fifth domain (EAR motif) at the C-terminus. Four IGT family members named MdoTAC1a, MdoTAC1b, MdoLAZY1, and MdoLAZY2 were found in the apple genome, sharing four conserved domains. Apple cultivars of four ideotypes (columnar, tip bearer, spur, and standard) were selected to characterize IGT family genes. However, little information is available regarding IGT family genes in apple. The tree architecture of apple (Malus × domestica Borkh.) affects fruit quality and yield. IGT family genes share the highly conserved motif GφL-(A/T) IGT in domain II and play an essential role in plant form. Wang, Limin Cai, Wenbo Du, Chuanhui Fu, Yan Xie, Xuan Zhu, Yuandi The isolation of the IGT family genes in Malus × domestica and their expressions in four idiotype apple cultivars The isolation of the IGT family genes in Malus × domestica and their expressions in four idiotype.
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