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Ovate family proteins (OFPs) are a family of plant growth regulators that play diverse roles in many aspects of physiological processes. OFPs have been characterized in various plant species including tomato,  Arabidopsis , and rice. However, little is known about OFPs in woody species. Here, a total of 30  PtOFP  genes were identified from the genome of  Populus trichocarpa  and were further grouped into four subfamilies based on their sequence similarities. Gene expression analysis indicated that some members of the  PtOFP  gene family displayed tissue/organ-specific patterns. Analysis of  cis -acting elements in the promoter as well as gene expression by hormone treatment revealed putative involvement of  PtOFPs  in hormonal response. Furthermore, PtOFP1 (Potri.006G107700) was further experimentally demonstrated to act as a transcriptional repressor. Yeast two-hybrid assay showed physical interactions of PtOFP1 with other proteins, which suggests that they might function in various cellular processes by forming protein complexes. In addition, overexpression of  PtOFP1  in  Arabidopsis  conferred enhanced tolerance to PEG-induced drought stress at seedling stage, as well as a higher survival rate than the wild type at mature stage. These results provide a systematic analysis of the  Populus OFP  gene family and lay a foundation for functional characterization of this gene family.

frontiers in plant science

Identification, Expression, and Interaction Analysis of Ovate Family Proteins in Populus trichocarpa Reveals a Role of PtOFP1 Regulating Drought Stress Response