Promoter activities of the putative thioglucosidase gene At2g44460 and APR2 are differentially suppressed by hormones. Five-day old seedlings grown identically as in Fig. 1 were treated for 48 h under either −S or +S supplemented with 1 μM hormones. CK, no hormone control; IAA, auxin; BA, Cytokinin; ACC, ethylene precursor; BR, brassinosteroids; JA, methyl jasmonic acid; SA, salicylic acid. (A) GUS staining pattern of the putative thioglucosidase gene At2g44460 promoter. (B) GUS staining pattern of the APR2 gene promoter