Abstract
Two strategies for selection of plant mutants altered in their ability to hydrolyze IAA conjugates are described. The rationale for both strategies is to form a conjugate between two chemical moieties in which one moiety is a toxin. The first strategy makes use of a toxic auxin analogue. For this approach a series of halogenated IAA analogues were tested for toxic properties to Lemna gibba and Zea mays. Several halogenated analogues were toxic, but only 5-Br-IAA was highly toxic to both species. The second strategy required a toxic compound with suitable functional groups to allow IAA conjugation. The mycotoxin patulin was found to be a suitable candidate. Uptake and hydrolysis of IAA-conjugates was studied in order to better define the conditions required for conjugate analogues to be effectively employed for selections.
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