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Background  Modifying plant architecture to increase photosynthesis efficiency and reduce shade avoidance response is very important for further yield improvement when crops are grown in high density. Identification of alleles controlling leaf angle in maize is needed to provide insight into molecular mechanism of leaf development and achieving ideal plant architecture to improve grain yield.    Methodology/Principal Findings  The gene cloning was done by using comparative genomics, and then performing real-time polymerase chain reaction (RT-PCR) analysis to assay gene expression. The gene function was validated by sequence dissimilarity analysis and QTL mapping using a functional cleaved amplified polymorphism (CAP).    Conclusions  The leaf angle is controlled by a major quantitative trait locus,  ZmTAC1  ( Zea mays  L. Leaf Angle Control 1).  ZmTAC1  has 4 exons encoding a protein with 263 amino acids, and its domains are the same as those of the rice  OsTAC1  protein.  ZmTAC1  was found to be located in the region of qLA2 by using the CAP marker and the F 2:3  families from the cross between Yu82 and Shen137. Real-time PCR analysis revealed  ZmTAC1  expression was the highest in the leaf-sheath pulvinus, less in the leaf and shoot apical meristem, and the lowest in the root. A nucleotide difference in the 5′-untranslated region (UTR) between the compact inbred line Yu82 (“CTCC”) and the expanded inbred line Shen137 (“CCCC”) influences the expression level of  ZmTAC1 , further controlling the size of the leaf angle. Sequence verification of the change in the 5′-UTR revealed  ZmTAC1  with “CTCC” was present in 13 compact inbred lines and  ZmTAC1  with “CCCC” was present in 18 expanded inbred lines, indicating  ZmTAC1  had been extensively utilized in breeding with regard to the improvement of the maize plant architecture.

Cloning and Characterization of a Putative TAC1 Ortholog Associated with Leaf Angle in Maize (Zea mays L.)