Research Progress on Auxin Responsive Non-canonical Aux/IAA Proteins in Plants
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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