negative regulation of brassinosteroid biosynthetic process
Any process that stops, prevents, or reduces the frequency, rate or extent of the chemical reactions and pathways resulting in the formation of brassinosteroids.
GO:0010422
regulation of brassinosteroid biosynthetic process
is_a
GO:0090032
negative regulation of steroid hormone biosynthetic process
is_a
GO:0016132
brassinosteroid biosynthetic process
negatively_regulates