WLP2, OsFLN2, and OsTRXz form a TRX-FLN regulatory module in the PEP complex. (A) Interaction of WLP2, OsTRXz, and OsFLN2 in a yeast two-hybrid assay. Yeast transformants were spotted on to control medium (SD/-Leu/-Trp [-LT]) and selective medium (SD/-Leu/-Trp/-His/-Ade [-LTHA] plus X-α-gal and Aureobasidin A [AbA]). (B) A bimolecular fluorescence complementation assay showed that OsTRXz can interact with WLP2 and OsFLN2 in rice protoplast cells. Bars=5 μm. (C) In vitro pull-down assay of WLP2, OsFLN2, and OsTRXz. The fusion proteins of WLP2 and OsFLN2 with a His tag (His-WLP2, His-OsFLN2) and OsTRXz with a GST tag (GST-OsTRXz) were detected by anti-His antibody and anti-GST antibody, respectively. (D–F) Levels of mRNA of WLP2 (D), OsFLN2 (E), and OsTRXz (F) under normal (26 °C) or high (32 °C) temperature conditions. (G) Immunoblot analyses of OsTRXz in wild-type (WT), wlp2 mutants, and WLP2 overexpression line 16 (OE-16) in seedlings at the third-leaf stage maintained at 26 °C and 32 °C.