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MORE FLORET1 Encodes a MYB Transcription Factor That Regulates Spikelet Development in Rice. 2020

Deyong Ren, and Yuchun Rao, and Haiping Yu, and Qiankun Xu, and Yuanjiang Cui, and Saisai Xia, and Xiaoqi Yu, and He Liu, and Haitao Hu, and Dawei Xue, and Dali Zeng, and Jiang Hu, and Guangheng Zhang, and Zhenyu Gao, and Li Zhu, and Qiang Zhang, and Lan Shen, and Longbiao Guo, and Qian Qian
State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou 310006, People's Republic of China.

Rice (Oryza sativa) spikelets have a unique inflorescence structure, and the mechanisms regulating their development are not yet fully understood. Moreover, approaches to manipulate spikelet development have the potential to increase grain yield. In this study, we identified and characterized a recessive spikelet mutant, namely more floret1 (mof1). The mof1 mutant has a delayed transition from the spikelet to the floral meristem, inducing the formation of extra lemma-like and palea-like organs. In addition, the main body of the palea was reduced, and the sterile lemma was enlarged and partially acquired hull (lemma and/or palea) identity. We used map-based cloning to identify the MOF1 locus and confirmed our identification by complementation and by generating new mof1 alleles using CRISPR-Cas9 gene editing. MOF1 encodes a MYB domain protein with the typical ethylene response factor-associated amphiphilic repression motifs, is expressed in all organs and tissues, and has a strong repression effect. MOF1 localizes to the nucleus and interacts with TOPLESS-RELATED PROTEINs to possibly repress the expression of downstream target genes. Taken together, our results reveal that MOF1 plays an important role in the regulation of organ identity and spikelet determinacy in rice.

UI MeSH Term Description Entries
D010940 Plant Proteins Proteins found in plants (flowers, herbs, shrubs, trees, etc.). The concept does not include proteins found in vegetables for which PLANT PROTEINS, DIETARY is available. Plant Protein,Protein, Plant,Proteins, Plant
D000483 Alleles Variant forms of the same gene, occupying the same locus on homologous CHROMOSOMES, and governing the variants in production of the same gene product. Allelomorphs,Allele,Allelomorph
D012275 Oryza A genus of grass family (Poaceae) that include several rice species. Oryza sativa,Rice,Rices
D014157 Transcription Factors Endogenous substances, usually proteins, which are effective in the initiation, stimulation, or termination of the genetic transcription process. Transcription Factor,Factor, Transcription,Factors, Transcription
D056626 Inflorescence A cluster of FLOWERS (as opposed to a solitary flower) arranged on a main stem of a plant. Flower Head,Inflorescence Types,Tassel,Flower Heads,Head, Flower,Heads, Flower,Inflorescence Type,Inflorescences,Tassels,Type, Inflorescence,Types, Inflorescence
D018506 Gene Expression Regulation, Plant Any of the processes by which nuclear, cytoplasmic, or intercellular factors influence the differential control of gene action in plants. Plant Gene Expression Regulation,Regulation of Gene Expression, Plant,Regulation, Gene Expression, Plant
D018519 Meristem A group of plant cells that are capable of dividing infinitely and whose main function is the production of new growth at the growing tip of a root or stem. (From Concise Dictionary of Biology, 1990) Root Tip,Meristems,Root Tips,Tip, Root,Tips, Root
D035264 Flowers The reproductive organs of plants. Blooms, Plant,Blossoms,Pistil,Plant Style,Anther, Plant,Carpal, Plant,Carpals, Plant,Filament, Flower,Flower Filament,Ovary, Plant,Petals, Plant,Plant Anther,Plant Calyx,Plant Carpals,Plant Corolla,Plant Ovary,Plant Petals,Plant Sepals,Plant Stamen,Plant Stigma,Sepals, Plant,Stamen, Plant,Stigma, Plant,Style, Plant,Anthers, Plant,Bloom, Plant,Blossom,Calyx, Plant,Calyxs, Plant,Corolla, Plant,Corollas, Plant,Filaments, Flower,Flower,Flower Filaments,Ovaries, Plant,Petal, Plant,Pistils,Plant Anthers,Plant Bloom,Plant Blooms,Plant Calyxs,Plant Carpal,Plant Corollas,Plant Ovaries,Plant Petal,Plant Sepal,Plant Stamens,Plant Stigmas,Plant Styles,Sepal, Plant,Stamens, Plant,Stigmas, Plant,Styles, Plant

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