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Studies on potentiation mechanism of auxin response via secreted peptide signalling in lateral root development

Title
Studies on potentiation mechanism of auxin response via secreted peptide signalling in lateral root development
Authors
조현우
Date Issued
2014
Publisher
포항공과대학교
Abstract
The phytohormone auxin is a key developmental signal in plants. Until now, only auxin perception has been described to trigger the release of transcription factors termed AUXIN RESPONSE FACTORs (ARFs) from their AUXIN/INDOLE-3-ACETIC ACID (AUX/IAA) repressor proteins and transcription of auxin-responsive gene expressions. Here, I show that phosphorylation of ARF7 and ARF19 via BRASSINOSTEROID-INSENSITIVE2 (BIN2) can also potentiates auxin signalling output during lateral root organogenesis. BIN2-mediated phosphorylation of ARF7 and ARF19 suppresses their interaction with AUX/IAAs, facilitates degradation of AUX/IAA, and subsequently enhances the transcriptional activity to their target genes LATERAL ORGAN BOUNDARIES-DOMAIN16 (LBD16) and LBD29. In this context, BIN2 is under the control of the TRACHEARY ELEMENT DIFFERENTIATION INHIBITORY FACTOR (TDIF) – TDIF RECEPTOR (TDR) module. TDIF-initiated TDR signalling directly acts on BIN2-mediated ARF phosphorylation, leading to the regulation of auxin signalling during lateral root development. In summary, this study delineates a TDIF-TDR-BIN2 signalling cascade controlling auxin perception-independent regulation of ARF and AUX/IAA interaction during lateral root development and provides important node for connecting diverse signaling networks in auxin-driven plant growth and development
URI
http://postech.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000001678621
http://oasis.postech.ac.kr/handle/2014.oak/2219
Article Type
Thesis
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