Fig. 7.
GUS activity in roots of transgenic PtrMATE1p::GUS plants. The PtrMATE1 gene promoter-driven GUS expression vector was introduced into P. tomentosa Carr. Transgenic plant seedlings were treated with 500 μM Al3+ for 0 h (A) and 12 h (B), respectively. GUS staining was observed in the mature roots of transgenic poplar. Scale bars, 1 mm. (C) Quantitative GUS activity in the roots of transgenic plants. Student’s t-test, *P<0.05. Results are shown as mean expression ± standard deviation (SD) of three independent experiments.