Share indices ended lower on Monday, tracking the weakness in Asian markets, but there were several individual stocks in the market that were in action and public sector stocks were among them.The benchmark Nifty 50 ended 0.4% down at 21771.70 points, and the Sensex closed 0.5% lower at 71731.42 points. On the other hand, the Nifty PSE index closed 2% higher at 9189.20 points.