Fig. 2

The expression levels of GhREVs family members in root (a), stem (b), the youngest expanded leaf (c) and shoot apex (d) at cotyledonary, the 2^nd, 4^th, 6^th, and 8^th leaf stages. The expression of GhREV1 in stem was regarded as ‘1’. GhActin9 was used as the internal control. There were no data of roots at the 8^th leaf stage due to the failure of RNA extraction