Northern analysis of miR159 and miR172 levels in flower samples. Tissues obtained from healthy tomato (cv Pusa Ruby; lane 3), ToLCNDV infected tomato (cv Pusa Ruby; lane 2) and LA1777 (lane 1) plants were checked for the expression of miR159 (1st panel) and miR172 (2nd panel). The northern blot analyses were carried out in two independent sets. For quantification, the expression of miRNA in LA1777 flower samples was taken as standard. The Ethidium bromide stained gels are shown as loading controls.