The BSE benchmark Sensex rose over 88 points in early trade on sustained buying by funds and retailers today.The 30-share barometer, which gained 100.47 pointsyesterday, rose further by 88.51 points, or 0.45 per cent, to 19,6 50. in the first five minutes of trading.Similarly, the wide-based National Stock Exchange index Nifty, moved up by 25.35 points, or 0,43 per cent, to 5,947.85.