title: miR172 regulates soybean nodulation.
abstract: Micro-RNAs (miRNAs) play a pivotal role in the control of gene expression and regulate plant developmental processes. miRNA 172 (miR172) is a conserved miRNA in plants reported to control the expression of genes involved in developmental phase transition, floral organ identity, and flowering time. However, the specific role of miR172 in legume nodulation is undefined. Ectopic expression of soybean miR172 resulted in an increase in nodule numbers in transgenic roots and an increase in the expression of both symbiotic leghemoglobin and nonsymbiotic hemoglobin. These nodules showed higher levels of nitrogenase activity. Further analysis revealed a complex regulatory circuit in which miR156 regulates miR172 expression and controls the level of an AP2 transcription factor. The latter, either directly or indirectly, controls the expression of nonsymbiotic hemoglobin, which is essential for regulating the levels of nodulation.
authors: Zhe
authors: Z
authors: Yan
authors: Md Shakhawat
authors: MS
authors: Hossain
authors: Jun
authors: J
authors: Wang
authors: Oswaldo
authors: O
authors: Valdés-López
authors: Yan
authors: Y
authors: Liang
authors: Marc
authors: M
authors: Libault
authors: Lijuan
authors: L
authors: Qiu
authors: Gary
authors: G
authors: Stacey
mesh_terms: D018507:Gene Expression Regulation, Developmental; D018506:Gene Expression Regulation, Plant; D006454:Hemoglobins / Q000235:genetics; D035683:MicroRNAs / Q000235:genetics* / Q000378:metabolism; D008954:Models, Biological; D009591:Nitrogenase / Q000378:metabolism; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D055170:Plant Root Nodulation; D018517:Plant Roots / Q000033:anatomy & histology / Q000235:genetics / Q000502:physiology; D030821:Plants, Genetically Modified; D018749:RNA, Plant / Q000235:genetics / Q000378:metabolism; D013025:Glycine max / Q000033:anatomy & histology / Q000235:genetics* / Q000502:physiology; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism
chemical_list: D006454:Hemoglobins; D035683:MicroRNAs; D010940:Plant Proteins; D018749:RNA, Plant; D014157:Transcription Factors; D009591:Nitrogenase