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KMID : 0368420110540010010
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Journal of Plant Biology
2011 Volume.54 No. 1 p.10 ~ p.14
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Stereoisomers of Castasterone, 3-Epicastasterone and 2,3-Diepicastasterone, in Immature Seeds of Phaseolus vulgaris
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Lee Sang-Cheul
Joo Se-Hwan
Kim Seong-Ki
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Abstract
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A capillary GC-MS analysis revealed that two stereoisomers of castasterone are contained in immature seeds of Phaseolus vulgaris. 400 MHz proton NMR analysis of the stereoisomers determined they are A ring epimers of castasterone, 3-epicastasterone and 2,3-diepicastasterone. In rice lamina inclination assay, 3-epicastasterone and 2,3-diepicastasterone showed reduced biological activity than that of castasterone. Together with our previous finding that 2-epicastasterone exhibits a less biological activity than CS, this result indicates that epimerization of hydroxyl at C-2 or/and C-3 is/are inactive processes to reduce biological activity of CS after exerting as a bioactive brassinosteroid in P. vulgaris.
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KEYWORD
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Brassinosteroids, 3-Epicastasterone, 2,3-Diepicastasterone, Structure elucidation, Biological activity
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