Fig. 5

Effects of MeJA on long-stalk glandular trichomes. a Exogenous MeJA application induced the initiation of long-stalk glandular trichomes. Scale bar = 100 μm. b Trichome density affected by MeJA application. Different letters show significant differences (P ≤ 0.05). c Transcript levels of NtHD-ZIP IVs upon 5.0 mM MeJA application. The lowest transcript level for each gene was regarded as a standard. L25 was selected as a control gene. The results were calculated by the 2^-ΔΔCT method