Fig. 5.

Several key regulators are involved during the tuber development, constituting a complex network. A ABA, auxin, SL maintained tuber dormancy. GA and CK stimulate tuber sprouting. B ABA and auxin are inhibitors to germinated tuber while, CK and GA are accelerators in sprouting. C Auxin acts as a stimulator and GA and CK act as a suppressor of root formation. CK enhanced the growth of shoot branching and bud growth, whereas ABA, auxin, GA, and SL are suppressors of shoot development. D At the tuber initiation stage, GA acts as an inhibitor, whereas auxin, CK, and SL stimulate tuberization. E During the tuber development stage, GA has an inhibitory role, whereas auxin and CK promote tuber development