Fig. 7From: A 1232 bp upstream sequence of glutamine synthetase 1b from Eichhornia crassipes is a root-preferential promoter sequenceGUS activity measurement. Note: Different letters in the group indicate significant differences in data within the group (P < 0.01). a The GUS activity in one line of transgenic tobacco tissue. b The GUS activity in root of transgenic tobacco under different light conditionsBack to article page