Fig 4. Expression analysis of GUS under the control of PMusaVND7 in leaves and petiole.
(A) GUS staining observed in banana leaf due to activity of PMusaVND7. (B) Transverse section of GUS stained leaf showing prominent and specific GUS staining in cells of the vascular bundle. Note the absence of staining in other cells. (C) Close-up of one of the leaf vascular bundle showing GUS staining in vessels and tracheids of the xylem. (D) Transverse section of the petiole indicating the vascular specific activity of the MusaVND7 promoter. Note the GUS activity in the central vessel cells and surrounding tracheary elements.