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MeJA treatment negatively affects cell proliferation in leaves and roots by down-regulating the expression of CYCB1;1. Leaf 3 at 12 DAS (A; bar = 1 mm) and root tip at 6 DAS (B; bar = 50 µm) of Arabidopsis seedlings carrying pCYCB1;1:Dbox-GUS were transferred for 48 h on medium without (−MeJA) or with (+MeJA) 50 µm MeJA. Blue staining indicates mitotic activity. Representative images of numerous independent biological replicates are shown.
