Identification of Brassinosteroids That Appear to Be Derived from Campesterol and Cholesterol in Tomato Shoots

Abstract

To obtain information about the biosynthesis of brassinosteroids (BRs) in tomato shoots, we examined endogenous BRs by gas chromatography-mass spectrometry. We identified two C M BRs, namely, castasterone and 6-deoxocastasterone, and a C 27 BR, 28-norcastasterone. Our findings suggest that the major BRs in tomato are derived from campesterol and cholesterol.