Ethylene

Ethylene is present in the tissues of ripening fruits, in the nodes of stems, and in senescent leaves and flowers. It leads to the release of the dormancy state and stimulates root and shoot growth as well as differentiation. Ethylene opens up flowers and ripens fruit, and it is responsible for leaf and fruit abscission.
Ethylene caused the bulb to awaken from its dormant state and similarly stimulated shoot and root growth.