The rupee closed flat 72.55 (provisional) against the US dollar on Wednesday as selling pressure in domestic equity markets weighed on investor sentiment.

Losses in the equity markets and a strengthening dollar against major currencies overseas kept the pressure on the rupee, forex traders said.

At the interbank forex market, the local unit opened almost flat at 72.56 against the greenback and witnessed an intra-day high of 72.51 and a low of 72.62.

It finally ended unchanged at 72.55 against the American currency, compared to its previous close.

The dollar index, which gauges the greenback's strength against a basket of six currencies, advanced 0.03 per cent to 91.91.