3,3’-diaminobenzidine (DAB) staining and trypan blue staining were performed as previously described [53, 54] on 5-leaf old seedlings cultivated in a phytotron for 3 days under 16 h of light / 8 h of dark at 4°C. The leaves from individual lines were used for DAB staining and trypan blue staining. Three biological replicates were performed.
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