Rising for the fourth straight day, the Sensex at the Bombay Stock Exchange gained 108 points, to 16,268 in opening trade, this morning, on buying by funds and retail investors, after Prime Minister Manmohan Singh said the government would pursue reforms to feed economic growth. Firming trends in other Asian bourses also lifted domestic market sentiment. Gaining further ground, the Sensex stood 281 points, or 1.7 percent in the green, at 16,440, a short while ago. Hong Kong's Hang Seng index was up 1.2 per cent, while Japan's Nikkei rose 0.5 per cent.