Mumbai, Jan. 8 -- The Indian rupee edged lower from a one-week high in opening trades on Thursday but manages to stay afloat Rs 90 per dollar mark. INR opened at Rs 89.96 per dollar and fell to a low of 89.97 so far during the day. Yesterday, rupee rose 31 paise to close at 89.87 against the US dollar, on falling international global crude oil prices. Besides, possible intervention by the Reserve Bank of India (RBI) may also have supported the counter, although muted local equities capped upside. Indian shares ended slightly lower on Wednesday to extend losses for a third day running as rising geopolitical tensions and tariff-related concerns overshadowed investor optimism around the earnings outlook. The benchmark S&P/BSE Sensex dropped ...