Shares in Anil Ambani-led Reliance Natural Resources and Reliance Power rose more than 4 percent each on Friday on market talk the two firms may be merged,dealers said. A spokeswoman for Anil Dhirubhai Ambani Group declined to comment when contacted by Reuters. At 2:02 p.m. (0832 GMT),the Reliance Natural and Reliance Power were up 4 percent and 4.3 percent respectively,while the main stock index was trading 0.2 percent higher.