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KMID : 0368420220650020099
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Journal of Plant Biology
2022 Volume.65 No. 2 p.99 ~ p.109
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Hierarchical Structures and Dissected Functions of MADS-Box Transcription Factors in Rice Development
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Yoon Jin-Mi
Cho Lae-Hyeon
Jung Ki-Hong
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Abstract
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Floral organ development and regulation of flowering time in rice is closely associated with MADS-box transcriptional factors (TFs). MADS-box proteins contain a conserved 60 amino acid MADS-box motif for a sequence-specific DNA-binding activity that also functions in dimerization and accessory factor binding. A systematic understanding of this MADS-box TF subfamily is needed to explain the functional complexity among the gene family members. In total, the function of 33 out of 75 MADS-box TFs in rice has been characterized. Meta-anatomical expression data based on a large collection of spatiotemporal microarray data integrated to the phylogenetic tree context was very effective at explaining the functional complexity or specificity among a large gene family. Subsequently, a cluster of MADS-box TFs consisting of 15 gene members showed preferred expression in floral organs, and their expression patterns are well correlated with previously identified functions in floral organ identity. In addition, the hierarchical structure of a group of MADS-box TFs, based on the expression patterns, was well supported by the genetic studies. OsMADS1 functions in the earliest step of floral organ development and affects the overall floral organ development by identifying downregulation of nine members in the same clade in osmads1 mutant and observed phenotypic changes. The combination of hierarchical structure and possible hetero-dimerization among MADS-box TFs allows for understanding the molecular and genetic regulatory model for floral organ development in rice. This work provides a comprehensive understanding of the functions of MADS-box TFs and will be a useful guide for further studies.
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KEYWORD
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Floral organ identity, MADS-box, Meta-expression analysis, Phylogenomic analysis, Rice
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