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SA interactions with JA or LN on PR1a-GUS expression in transgenic tobacco. GUS activity in explants of transgenic tobacco at 24 h following treatment with water or 10, 100, 250 μm SA with either 0, 10, 100, 250 μm JA (A) or 0, 10, 100, 250 μm α-LN (B). Data are given as mean (n = 6) GUS activity; pmol 4-methylumbelliferone min−1 explant ± se.
