Turkey's benchmark index started the day with a 180.81-point decrease to open at 90,472.99 points on Tuesday.
On the second transaction day of the week, the BIST 100 index dropped by 0.20 percent.
The banking sector index was down 0.36 percent while the holding sector index was flat.
Among all sectors, the insurance sector index was the best performer -- up 0.98 percent -- while the information technology index started the day with the biggest decline, falling by 0.73 percent.
The BIST 100 was up 590.10 points or 0.66 percent to reach 90,653.80 with a total trading volume of 3.5 billion Turkish liras (approximately $954 million) at the close on Monday.
The U.S. dollar/Turkish lira exchange rate rose to 3.6930 at 9.30 a.m. local time (0630GMT) Tuesday, compared with 3.6640 at Monday’s close.