Indian domestic stock markets opened slightly lower today amid investor caution over rising global trade tensions. The Sensex dipped 257.89 points to 81,990.72, while the Nifty-50 declined 90.35 points to 25,406.20. Bank Nifty also slipped 91.70 points to 60,627.85. The Indian rupee was trading at 90.10 against the dollar, reflecting the global uncertainty.