Asian markets are exhibting mixed trend in morning trades.Japan's Nikkei has rallied 156 points to 18,088.China's Shanghai Composite index has plunged 97 points to 3817, and Hong Kong's Hang Seng has slipped 14 points to 21,924.The Taiwan Weighted index has dropped 27 points to 8865.The Straits Times index is marginally (two points) up at 3540, the Seoul Composite index has added five points to 1757.