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Dof (DNA binding with one finger) proteins, a class of plant-specific transcription factors, are involved in plant growth and developmental processes and stress responses. However, their biological functions remain to be elucidated, especially in rice ( Oryza sativa  L.). Previously, we have reported that  OsDof12  can promote rice flowering under long-day conditions. Here, we further investigated the other important agronomical traits of the transgenic plants overexpressing  OsDof12  and found that overexpressing  OsDof12  could lead to reduced plant height, erected leaf, shortened leaf blade, and smaller panicle resulted from decreased primary and secondary branches number. These results implied that  OsDof12  is involved in rice plant architecture formation. Furthermore, we performed a series of Brassinosteroid (BR)-responsive tests and found that overexpression of  OsDof12  could also result in BR hyposensitivity. Of note, in WT plants the expression of  OsDof12  was found up-regulated by BR treatment while in  OsDof12  overexpression plants two positive BR signaling regulators,  OsBRI1  and  OsBZR1 , were significantly down-regulated, indicating that  OsDof12  may act as a negative BR regulator in rice. Taken together, our results suggested that overexpression of  OsDof12  could lead to altered plant architecture by suppressing BR signaling. Thus,  OsDof12  might be used as a new potential genetic regulator for future rice molecular breeding.

Overexpression of OsDof12 affects plant architecture in rice (Oryza sativa L.)