The BSE benchmark index Sensex today rose by nearly 137 points in early trade .The 30-share BSE index, which had gained 56.67 points in the past two sessions, rallied further by 136.79 points, or 0.79 per cent, to 17,324.13 with all sectoral indices, led by realty and IT, trading in the positive zone clocking gains of up to 1.43 per cent.The wide-based National Stock Exchange index (Nifty) moved up by 32.70 points, or 0.63 per cent, to 5,241.70.