Fig. 4From: A 1232 bp upstream sequence of glutamine synthetase 1b from Eichhornia crassipes is a root-preferential promoter sequenceGUS expression in transgenic tobacco root. a The tobacco root transformed with plasmid pBI121; b The tobacco root transformed with plasmid p1200::GUS; c The tobacco root transformed with plasmid p900::GUS; d The tobacco root transformed with plasmid p600::GUS; e The tobacco root transformed with plasmid p400::GUS; f The tobacco root transformed with plasmid pBI101; g The wild tobacco rootBack to article page