The Indian equity benchmarks gave up intraday gains to end lower for fourth straight session on Wednesday after the Reserve Bank of India hiked repo rate by 50 basis points to control inflation which has been above its tolerance level of 6 per cent for quite some time now. The markets initially welcomed the central bank's move to increase rates by 50 basis points but gave up gains in last hour of trade. The Sensex fell as much as 741 points from the day's highest level and Nifty 50 index briefly fell below 16,300 after hitting an intraday high of 16,514.