title: MULTI-FLORET SPIKELET1, which encodes an AP2/ERF protein, determines spikelet meristem fate and sterile lemma identity in rice.
abstract: The spikelet is a unique inflorescence structure of grass. The molecular mechanism that controls the development of the spikelet remains unclear. In this study, we identified a rice (Oryza sativa) spikelet mutant, multi-floret spikelet1 (mfs1), that showed delayed transformation of spikelet meristems to floral meristems, which resulted in an extra hull-like organ and an elongated rachilla. In addition, the sterile lemma was homeotically converted to the rudimentary glume and the body of the palea was degenerated in mfs1. These results suggest that the MULTI-FLORET SPIKELET1 (MFS1) gene plays an important role in the regulation of spikelet meristem determinacy and floral organ identity. MFS1 belongs to an unknown function clade in the APETALA2/ethylene-responsive factor (AP2/ERF) family. The MFS1-green fluorescent protein fusion protein is localized in the nucleus. MFS1 messenger RNA is expressed in various tissues, especially in the spikelet and floral meristems. Furthermore, our findings suggest that MFS1 positively regulates the expression of LONG STERILE LEMMA and the INDETERMINATE SPIKELET1 (IDS1)-like genes SUPERNUMERARY BRACT and OsIDS1.
authors: Rice Research Institute, Southwest University, Chongqing 400715, China.
authors: Deyong
authors: D
authors: Ren
authors: Yunfeng
authors: Y
authors: Li
authors: Fangming
authors: F
authors: Zhao
authors: Xianchun
authors: X
authors: Sang
authors: Junqiong
authors: J
authors: Shi
authors: Nan
authors: N
authors: Wang
authors: Shuang
authors: S
authors: Guo
authors: Yinghua
authors: Y
authors: Ling
authors: Changwei
authors: C
authors: Zhang
authors: Zhenglin
authors: Z
authors: Yang
authors: Guanghua
authors: G
authors: He
mesh_terms: D035264:Flowers / Q000166:cytology / Q000235:genetics*; D018506:Gene Expression Regulation, Plant; D049452:Green Fluorescent Proteins / Q000235:genetics / Q000378:metabolism; D018519:Meristem / Q000235:genetics*; D009154:Mutation; D012275:Oryza / Q000235:genetics* / Q000502:physiology; D010802:Phylogeny; D010940:Plant Proteins / Q000235:genetics* / Q000378:metabolism; D030821:Plants, Genetically Modified; D017434:Protein Structure, Tertiary; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism
chemical_list: D010940:Plant Proteins; D011993:Recombinant Fusion Proteins; D049452:Green Fluorescent Proteins
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