Abstract
Since 1995 the role of fungal hypaphorine in plants has been widely investigated and its IAA‐antagonist activity recognized. Evidence of competitive antagonism includes organ development, gene expression or molecule–molecule interaction levels. Based on present knowledge, three sites of hypaphorine/IAA competition and subsequent signalling pathways have been hypothesized: the extracellular signalling pathway, the intracellular signalling pathway, and the transmembrane signalling pathway. Hypaphorine with other active indole alkaloids should be regarded as a new class of IAA antagonist finely regulating specific steps of plant growth or development.
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