Equity benchmark indices opened lower on Wednesday with the BSE Sensex falling by 111.85 points to 81,809.44 and the NSE Nifty declining by 39.2 points to 25,001.90 due to weak trends in Asian markets and selling pressure in Tata Motors. Gains were recorded in Asian Paints, Bharti Airtel, ITC, and Hindustan Unilever.