  In this paper, we investigate the nature of self-interacting potential that
can support the accelerated expansion of the universe as indicated by
observational data. For this purpose, we consider the Bianchi type I (BI)
universe model in the Brans-Dicke (BD) field scenario and use a power law for
both the scalar field and the scale factor. It is found that the accelerated
expansion of the universe can be discussed for a positive power law potential
with negative values of the BD parameter. We also explore the evolution of
energy density perturbations. This analysis indicates that the model allows
growing modes for negative values of the BD parameter and $m>0$.
