DiscussionAphids have evolved mechanisms to break the structural barrierof the plant cell wall during plant tissue probing and penetra-tion. Subsequent gall induction requires dramatic changes in theplant gene expression and cellular morphology as a response tothe aphid’s effectors. Morphological re-arrangements and physio-logical changes go along with available resource. Here, evidence ispresented that sugars are symplastically transported towards thenodosity and active intercellular trafficking of sugars related to thestarch metabolism occur. In the present work, different approacheswere taken in order to pursue a consolidated line of evidence