New auxin analogues offer less toxic PGR alternatives
A new class of reduced toxicity plant growth regulators (PGRs) has been developed by researchers from the US Purdue University (Lafayette, Indiana) and a consortium of Japanese universities. The new PGRs, known as alkoxy-auxin analogues, are 5-alkoxy derivatives of indole 3-acetic acid and 7-alkoxy derivatives of naphthalene 1-acetic acid. Their hexyloxy and benzyloxy derivatives act as potent inhibitors of auxin action in plants. Unlike current growth regulators, they have no intrinsic hormonal activity and do not affect other plant processes.