They threw gelatin sticks into the room where she was sleeping, police said.
One of their relatives, who procured the sticks, was also arrested, they said.
23-year-old Ragapriya, working in a software firm in Bangalore, fell in love with a colleague Tharamanaglam and they got married at a registrar's office in Salem district on March 14, police said.
Police said her parents got their relative, who had taken a loan from them, to contact the quarry owner and get the gelatine sticks.
This morning, they threw the sticks in but it exploded in a room adjacent to the one in which the couple were sleeping, police said.