Non-canonical Auxin Signaling Pathway in Plants

doi:10.13560/j.cnki.biotech.bull.1985.2020-0523

Abstract

Abstract: Phytohormone auxin is involved in various processes of plant growth and development,including embryogenesis,organogenesis,tropism and so on. Plants precisely regulate growth and development by coordinating auxin biosynthesis and metabolism,polar transport and signal transduction. The biological function of auxin relies on the diverse downstream responses converted by signal transduction cascades after being sensed. The canonical auxin signaling pathway starts from its perception by the SCF^TIR1/AFB receptor in nucleus,followed by the ubiquitination-based degradation of Aux/IAA transcription repressors and the release of ARF transcription factors,finally regulates gene transcription. Although this canonical signaling pathway illustrates the molecular mechanisms of auxin in regulating many plant developmental processes,there still have many auxin actions that cannot be explained by this pathway. This review focuses on the regulatory mechanisms of non-canonical auxin signaling pathways and its critical role in plant growth and development,as well as discusses and prospects the challenges and the future research directions in this field.

Key words: Aux/IAAs, transcriptional regulation, non-transcriptional regulation, TIR1/AFBs, TMK receptor-like kinase

MA Jun, XU Tong-da. Non-canonical Auxin Signaling Pathway in Plants[J]. Biotechnology Bulletin, 2020, 36(7): 15-22.

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