The bifurcation from the static petal pattern to the fluctuating petal pattern in a liquid crystal light valve with optical rotational feedback is investigated experimentally. At a threshold voltage of the bifurcation, rotationally propagating patches arises on the petals. When increasing the applied voltage, the motion of the patches becomes irregular and the pattern develops into space-time fluctuations. By measuring the time correlation function for the major spatial wave numbers, the characteristic features of the spatiotemporal fluctuations are analyzed in detail.