Abstract
Multiple plant developmental processes, such as lateral root development, depend on auxin distribution patterns that are in part generated by the PIN-formed family of auxin-efflux transporters. Here we propose that AUXIN RESPONSE FACTOR7 (ARF7) and the ARF7-regulated FOUR LIPS/MYB124 (FLP) transcription factors jointly form a coherent feed-forward motif that mediates the auxin-responsive PIN3 transcription in planta to steer the early steps of lateral root formation. This regulatory mechanism might endow the PIN3 circuitry with a temporal ‘memory' of auxin stimuli, potentially maintaining and enhancing the robustness of the auxin flux directionality during lateral root development. The cooperative action between canonical auxin signalling and other transcription factors might constitute a general mechanism by which transcriptional auxin-sensitivity can be regulated at a tissue-specific level.
Highlights
Multiple plant developmental processes, such as lateral root development, depend on auxin distribution patterns that are in part generated by the PIN-formed family of auxin-efflux transporters
The auxin signalling pathway that is central to lateral roots (LRs) induction depends largely upon the presence of the Auxin Response transcription Factor[7] (ARF7) and SOLITARY ROOT/IAA14 (SLR)[9]
We tested whether the auxin inducible expression of FOUR LIPS/MYB124 (FLP) depends upon SLR/IAA14-ARF7based auxin signalling
Summary
Multiple plant developmental processes, such as lateral root development, depend on auxin distribution patterns that are in part generated by the PIN-formed family of auxin-efflux transporters. We propose that AUXIN RESPONSE FACTOR7 (ARF7) and the ARF7-regulated FOUR LIPS/MYB124 (FLP) transcription factors jointly form a coherent feed-forward motif that mediates the auxin-responsive PIN3 transcription in planta to steer the early steps of lateral root formation. Among the LR-regulating PINs is PIN3, which is transiently expressed in the endodermis cells overlaying FCs to promote their transition to LR initiation[12], and is later in development expressed in LR primordiumoverlaying tissues to facilitate LR emergence[6]. These examples demonstrate the importance of dynamic PIN expression patterns in LR development. Almost nothing is known about how such regulators bind to cis-elements in the PIN regulatory regions and how they are integrated with the canonical auxin signalling pathway to regulate PIN expression during organogenetic processes such as LR development
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