Journal
CURRENT OPINION IN PLANT BIOLOGY
Volume 28, Issue -, Pages 144-153Publisher
CURRENT BIOLOGY LTD
DOI: 10.1016/j.pbi.2015.10.009
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Funding
- Horticultural Plant Biology and Metabolomics Center
- Haixia Institute of Science and Technology
- Fujian Agriculture and Forestry University
- US National Institute of General Medical Sciences [R01GM081451, R01GM100130]
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Auxin is well known to control pattern formation and directional growth at the organ/tissue levels via the nuclear TIR1/AFB receptor-mediated transcriptional responses. Recent studies have expanded the arena of auxin actions as a trigger or key regulator of cell polarization and morphogenesis. These actions require non-transcriptional responses such as changes in the cytoskeleton and vesicular trafficking, which are commonly regulated by ROP/Rac GTPase-dependent pathways. These findings beg for the question about the nature of auxin receptors that regulate these responses and renew the interest in ABP1 as a cell surface auxin receptor, including the work showing auxin-binding protein 1 (ABP1) interacts with the extracellular domain of the transnnembrane kinase (TMK) receptor-like kinases in an auxin-dependent manner, as well as the debate on this auxin binding protein discovered about 40 years ago. This review highlights recent work on the non-transcriptional auxin signaling mechanisms underscoring cell polarity and shape formation in plants.
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