Use of an Acylcyclohexanedione Growth Retardant, LAB 198 999, to Determine Whether Gibberellin A(20) Has Biological Activity per se in Dark-Grown Dwarf (le) Seedlings of Pisum sativum |
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Authors: | Sponsel V M Reid J B |
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Institution: | Department of Agronomy, University of Wisconsin-Madison, Madison, Wisconsin 53706. |
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Abstract: | Dwarf (le5839) seedlings of Pisum sativum respond to gibberellin A20 (GA20) in the dark, although the same dosage of GA20 applied to light-grown le5839 seedlings elicits no growth response. The acylcyclohexanedione growth retardant, LAB 198 999, which is known to inhibit gibberellin oxidation and in particular 3β-hydroxylation such as the conversion of GA20 to GA1, also inhibits the growth response of dark-grown dwarf (le5839) seedlings to GA20. Thus, the biological activity of GA20 in the dark appears to be a consequence of its conversion to GA1, even though it is known from studies with light-grown seedlings that the le mutation reduces the conversion of GA20 to GA1. |
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