The plant hormone auxin regulates many processes of plant growth and development,including embryonic development,organogenesis,and tropism,as well as environmental adaptation.To perform these functions,auxin mainly depends on the typical TIR1/AFB-auxin-Aux/IAA-ARF signaling pathway.In this pathway,the canonical Aux/IAA proteins composed of four conserved domains play a key role in auxin signaling as co-receptor with TIR1/AFB.Recently,some non-canonical Aux/IAA proteins lacking conserved domain(s)were also found to be involved in the auxin response.This review focuses on the research advances of non-canonical Aux/IAA proteins on their structure,biological function and roles in auxin signal transduction,and discusses the future research directions of these proteins.
auxinAux/IAA proteinnon-canonical Aux/IAA proteinstructure and functionsignal transduction
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