Figure 2.

Influence of H₂S exposure on thiol, Met, and sulfate in shoot phloem exudates of wild-type and transgenic poplar. Six- to 8-week-old wild-type poplar (□, ambient air; ▩, H₂S) and transgenic poplar (▪, ambient air; ▨, H₂S) were exposed for 48 h to ambient air or 0.25 μL L⁻¹ H₂S, respectively. The data shown are means ± sd with phloem exudates from six to seven poplar plants each. Significant differences at P < 0.05 between treatments are indicated with different indices. Significant differences between the two poplar lines were indicated with A and B. n.d., Not detected. Note: 10-fold higher scale for sulfate and glutathione (GSH). FW, Fresh weight.