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We screened steroid derivatives and found that spironolactone, an inhibitor of both 17β-hydroxysteroid dehydrogenase (17β-HSD) and aldosterone receptor, is an inhibitor of phytohormone brassinosteroid (BR) action in plants. Under both dark and light growing conditions, spironolactone induced morphological changes in Arabidopsis, characteristic of brassinosteroid-deficient mutants. Spironolactone-treated...
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