scholarly journals Corrigendum to: Auxin signaling through SCFTIR1/AFBs mediates feedback regulation of IAA biosynthesis

2021 ◽  
Author(s):  
Shin Takato ◽  
Yusuke Kakei ◽  
Marie Mitsui ◽  
Yosuke Ishida ◽  
Masashi Suzuki ◽  
...  
Keyword(s):  
Feedback Regulation ◽  
Auxin Signaling ◽  
Iaa Biosynthesis

scholarly journals Auxin signaling through SCFTIR1/AFBs mediates feedback regulation of IAA biosynthesis

2017 ◽  
Vol 81 (7) ◽  
pp. 1320-1326 ◽  
Author(s):  
Shin Takato ◽  
Yusuke Kakei ◽  
Marie Mitsui ◽  
Yosuke Ishida ◽  
Masashi Suzuki ◽  
...  
Keyword(s):  
Feedback Regulation ◽  
Auxin Signaling ◽  
Iaa Biosynthesis

scholarly journals Rapid auxin-mediated phosphorylation of Myosin regulates trafficking and polarity in Arabidopsis

2021 ◽  
Author(s):  
Huibin Han ◽  
Inge Verstraeten ◽  
Mark Roosjen ◽  
Ewa Mazur ◽  
Nikola Rydza ◽  
...  
Keyword(s):  
Plant Development ◽  
Auxin Transport ◽  
Adaptor Protein ◽  
Feedback Regulation ◽  
Cellular Responses ◽  
Central Component ◽  
Auxin Signaling ◽  
Auxin Response ◽  
Cellular Processes ◽  
Myosin Xi

The signaling molecule auxin controls plant development through a well-known transcriptional mechanism that regulates many genes. However, auxin also triggers cellular responses within seconds or minutes, and mechanisms mediating such fast responses have remained elusive. Here, we identified an ultrafast auxin-mediated protein phosphorylation response in Arabidopsis roots that is largely independent of the canonical TIR1/AFB receptors. Among targets of this novel response are Myosin XI and its adaptor protein MadB2. We show that their auxin-mediated phosphorylation regulates trafficking and polar, subcellular distribution of PIN auxin transporters. This phosphorylation-based auxin signaling module is indispensable during developmental processes that rely on auxin-mediated PIN repolarization, such as termination of shoot gravitropic bending or vasculature formation and regeneration. Hence, we identified a fast, non-canonical auxin response targeting multiple cellular processes and revealed auxin-triggered phosphorylation of a myosin complex as the mechanism for feedback regulation of directional auxin transport, a central component of auxin canalization, which underlies self-organizing plant development.

scholarly journals Negative Feedback Regulation of Auxin Signaling by ATHB8/ACL5–BUD2 Transcription Module

2014 ◽  
Vol 7 (6) ◽  
pp. 1006-1025 ◽  
Author(s):  
Simona Baima ◽  
Valentina Forte ◽  
Marco Possenti ◽  
Andrés Peñalosa ◽  
Guido Leoni ◽  
...  
Keyword(s):  
Negative Feedback ◽  
Feedback Regulation ◽  
Auxin Signaling ◽  
Negative Feedback Regulation

scholarly journals Genetic mechanisms in the repression of flowering by gibberellins in apple (Malus x domestica Borkh.)

BMC Genomics ◽  
2019 ◽  
Vol 20 (1) ◽  
Author(s):  
Songwen Zhang ◽  
Christopher Gottschalk ◽  
Steve van Nocker
Keyword(s):  
Shoot Apex ◽  
Higher Plants ◽  
Sequence Data ◽  
Feedback Regulation ◽  
Shoot Elongation ◽  
Auxin Signaling ◽  
Flower Formation ◽  
Node Number ◽  
Woody Perennial ◽  
Genetic Mechanisms

Abstract Background Gibberellins (GAs) can have profound effects on growth and development in higher plants. In contrast to their flowering-promotive role in many well-studied plants, GAs can repress flowering in woody perennial plants such as apple (Malus x domestica Borkh.). Although this effect of GA on flowering is intriguing and has commercial importance, the genetic mechanisms linking GA perception with flowering have not been well described. Results Application of a mixture of bioactive GAs repressed flower formation without significant effect on node number or shoot elongation. Using Illumina-based transcriptional sequence data and a newly available, high-quality apple genome sequence, we generated transcript models for genes expressed in the shoot apex, and estimated their transcriptional response to GA. GA treatment resulted in downregulation of a diversity of genes participating in GA biosynthesis, and strong upregulation of the GA catabolic GA2 OXIDASE genes, consistent with GA feedback and feedforward regulation, respectively. We also observed strong downregulation of numerous genes encoding potential GA transporters and receptors. Additional GA-responsive genes included potential components of cytokinin (CK), abscisic acid (ABA), brassinosteroid, and auxin signaling pathways. Finally, we observed rapid and strong upregulation of both of two copies of a gene previously observed to inhibit flowering in apple, MdTFL1 (TERMINAL FLOWER 1). Conclusion The rapid and robust upregulation of genes associated with GA catabolism in response to exogenous GA, combined with the decreased expression of GA biosynthetic genes, highlights GA feedforward and feedback regulation in the apple shoot apex. The finding that genes with potential roles in GA metabolism, transport and signaling are responsive to GA suggests GA homeostasis may be mediated at multiple levels in these tissues. The observation that TFL1-like genes are induced quickly in response to GA suggests they may be directly targeted by GA-responsive transcription factors, and offers a potential explanation for the flowering-inhibitory effects of GA in apple. These results provide a context for investigating factors that may transduce the GA signal in apple, and contribute to a preliminary genetic framework for the repression of flowering by GAs in a woody perennial plant.

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