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Dwarf (le(5839)) seedlings of Pisum sativum respond to gibberellin A(20) (GA(20)) in the dark, although the same dosage of GA(20) applied to light-grown le(5839) seedlings elicits no growth response. The acylcyclohexanedione growth retardant, LAB 198 999, which is known to inhibit gibberellin oxidation and in particular 3beta-hydroxylation such as the conversion of GA(20) to GA(1), also inhibits the growth response of dark-grown dwarf (le(5839)) seedlings to GA(20). Thus, the biological activity of GA(20) in the dark appears to be a consequence of its conversion to GA(1), even though it is known from studies with light-grown seedlings that the le mutation reduces the conversion of GA(20) to GA(1).

plant physiology

Use of an Acylcyclohexanedione Growth Retardant, LAB 198 999, to Determine Whether Gibberellin A20 Has Biological Activity per se in Dark-Grown Dwarf (le5839) Seedlings of Pisum sativum