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Plants change as they develop. Some of these changes occur gradually over a long period of time, whereas others occur quickly, often resulting in major changes in shoot morphology. This latter phenomenon is termed phase change, and is the primary focus of our research. We are particularly interested in the juvenile-to-adult transition, also known as vegetative phase change. This transition precedes flowering, and is characterized by changes in shoot architecture and patterns of cellular differentiation, by an increase in reproductive competence, and by changes in a variety of physiological processes. Vegetative phase change is promoted by a group of plant-specific transcription factors (SBP/SPL proteins), whose expression is repressed during the juvenile phase by the miRNAs, miR156 and miR157. Vegetative phase change occurs when the levels of miR156/miR157 decline, leading to an increase in the abundance of SBP/SPL proteins. We are studying the temporal regulation of miR156/miR157 and the organization and function of the pathways they control.
We work primarily with Arabidopsis thaliana, but have recently begun to explore the mechanism and evolution of vegetative phase change in the Acacieae, a pantropical family of nitrogen-fixing trees that includes species that do, and do not, undergo major morphological changes during vegetative phase change. In addition to studying the timing of vegetative phase change, we are interested in the molecular mechanism by which miR156/miR157 regulate gene expression, and have identified a number of genes involved in this process.
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G3-GENES GENOMES GENETICSno. 3 (2024)
NEW PHYTOLOGISTno. 3 (2024): 829-831
Plant, cell & environmentno. 4 (2022): 1286-1297
R Scott Poethig, William L Cullina,Erin Doody, Taré Floyd,Jim P Fouracre,Tieqiang Hu,Mingli Xu,Jianfei Zhao
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