Figure 4

BdCESA4 and BdCESA7 are expressed in cells undergoing secondary wall deposition in the stem. Expression of CESA4 (A, B) and CESA7 (D, E) analyzed by in situ hybridization at three weeks of development when the inflorescence was just emerging from the flag leaf. Cross sections through the first internode were labeled with anti-sense probes, imaged at 10x (A, D) and 40x (B, E); and sense probes, imaged at 40x (C, F). xv, xylem vessel; p, phloem; ep, epidermis; Scale bar = 50 μm.