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Histochemical assay of GUS expression in organs of P. tabuliformis, P. yunnanensis, and Picea crassifolia transformed by agroinfiltration. GUS expression was examined in organ cross-sections at 24, 48, and 72 h after infection. a Callus and b hypocotyl and needles of P. tabuliformis. c Hypocotyl of Picea crassifolia. d Hypocotyl of P. yunnanensis. Negative controls (without pBI121). Each treatment comprised 30 explants and was performed in triplicate
