Figure 6.

Cytokinins (CKs) accumulate in P. populi-infected poplar stems. Samples were collected from separate trees at each time point. Relative levels of CKs were quantified by LC-tandem mass spectrometry. Data were analyzed by Student’s t-test (*, p ≤ 0.05; **, p < 0.01; and ***, p < 0.001; ns, non-significant). Data presented in figures are mean ± SE (n = 5). IPR, isopentenyladenine riboside; cZR, cis-zeatin riboside; oT, ortho-topolin; IP7G, isopentenyladenine-N⁷-glucoside; tZ9G, trans-zeatin N⁹-glucoside; cZROG, cis-zeatin riboside-O-glucoside; dpi, days post inoculation; DW dry weight.