Involvement of secondary messengers and small organic molecules in auxin perception and signaling

Di, Dong‐Wei; Zhang, Caiguo; Guo, Guang-Qin

doi:10.1007/s00299-015-1767-z

Cited by 25 publications

(14 citation statements)

References 107 publications

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“…A model to explain some of the actions of melatonin in its role an as auxin-like regulator has recently been proposed (Arnao and Hernández-Ruiz, 2017a). The signalling molecule nitric oxide (NO), which is involved in a variety of physiological processes during plant growth and development and is an important modulator of stress responses and pathophysiological processes, seems to be a key player in this respect (Di et al, 2015;Hussain et al, 2016). NO has been extensively reported to regulate auxin responses in roots, adventitious roots, lateral roots, root hair formation and root gravitropism (Pagnussat et al, 2002;Correa-Aragunde et al, 2004;Hu et al, 2005;Lombardo et al, 2006).…”

Section: Melatonin and Auxin: Role In Growth Rhizogenesis And Tropismmentioning

confidence: 99%

Melatonin and its relationship to plant hormones

2017

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Melatonin is an important modulator of gene expression related to plant hormones, e.g. in auxin carrier proteins, as well as in metabolism of indole-3-acetic acid (IAA), gibberellins, cytokinins, abscisic acid and ethylene. Most of the studies performed have dealt with the auxin-like activity of melatonin which, in a similar way to IAA, is able to induce growth in shoots and roots and stimulate root generation, giving rise to new lateral and adventitious roots. Melatonin is also able to delay senescence, protecting photosynthetic systems and related sub-cellular structures and processes. Also, its role in fruit ripening and post-harvest processes as a gene regulator of ethylene-related factors is relevant. Another decisive aspect is its role in the pathogen-plant interaction. Melatonin appears to act as a key molecule in the plant immune response, together with other well-known molecules such as nitric oxide and hormones, such as jasmonic acid and salicylic acid. In this sense, the discovery of elevated levels of melatonin in endophytic organisms associated with plants has thrown light on a possible novel form of communication between beneficial endophytes and host plants via melatonin.

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Section: Melatonin and Auxin: Role In Growth Rhizogenesis And Tropismmentioning

confidence: 99%

Melatonin and its relationship to plant hormones

2017

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“…ARF genes are expressed in dynamic and differential patterning during development, and genetic studies have shown that individual ARFs control distinct developmental processes (Rademacher et al, 2012 ). Members of the ARF family of proteins contain domains associated with DNA binding, transcriptional activation or repression, and protein-protein interactions during auxin perception and signaling processes (Guilfoyle and Hagen, 2007 ; Di et al, 2015a ). Recently, the ARF gene family has been also investigated in several plants based on the recent release of the genome such as citrus, Medicago truncatula and Gossypium raimondii using both bioinformatics and molecular analyses (Li et al, 2015 ; Shen et al, 2015a ; Sun et al, 2015 ).…”

Section: Introductionmentioning

confidence: 99%

A Review of Auxin Response Factors (ARFs) in Plants

et al. 2016

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Auxin is a key regulator of virtually every aspect of plant growth and development from embryogenesis to senescence. Previous studies have indicated that auxin regulates these processes by controlling gene expression via a family of functionally distinct DNA-binding auxin response factors (ARFs). ARFs are likely components that confer specificity to auxin response through selection of target genes as transcription factors. They bind to auxin response DNA elements (AuxRE) in the promoters of auxin-regulated genes and either activate or repress transcription of these genes depending on a specific domain in the middle of the protein. Genetic studies have implicated various ARFs in distinct developmental processes through loss-of-function mutant analysis. Recent advances have provided information on the regulation of ARF gene expression, the role of ARFs in growth and developmental processes, protein–protein interactions of ARFs and target genes regulated by ARFs in plants. In particular, protein interaction and structural studies of ARF proteins have yielded novel insights into the molecular basis of auxin-regulated transcription. These results provide the foundation for predicting the contributions of ARF genes to the biology of other plants.

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“…For instance, 1-Nnaphthylphthalamic acid (NPA) specifically inhibits PIN and ABCB cellular auxin transporters (Kleine-Vehn et al, 2006;Petrásek et al, 2006;Sauer et al, 2006;Blakeslee et al, 2007). On the other hand, PCIB is a putative auxin signaling inhibitor that has been reported to reduce polar auxin transport in diverse species by competing for auxin binding sites (Rose and Bopp, 1983;Oono et al, 2003;Hayashi et al, 2008;Belz and Piepho, 2013;Di et al, 2015). PCIB strongly inhibits auxin transport, probably because auxin signaling is required to promote PIN auxin transport (Sauer et al, 2006).…”

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confidence: 99%

Initial Bud Outgrowth Occurs Independent of Auxin Flow from Out of Buds

2018

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Apical dominance is the process whereby the shoot tip inhibits the growth of axillary buds along the stem. It has been proposed that the shoot tip, which is the predominant source of the plant hormone auxin, prevents bud outgrowth by suppressing auxin canalization and export from axillary buds into the main stem. In this theory, auxin flow out of axillary buds is a prerequisite for bud outgrowth, and buds are triggered to grow by an enhanced proportional flow of auxin from the buds. A major challenge of directly testing this model is in being able to create a bud-or stem-specific change in auxin transport. Here we evaluate the relationship between specific changes in auxin efflux from axillary buds and bud outgrowth after shoot tip removal (decapitation) in the pea (Pisum sativum). The auxin transport inhibitor 1-N-naphthylphthalamic acid (NPA) and to a lesser extent, the auxin perception inhibitor p-chlorophenoxyisobutyric acid (PCIB), effectively blocked auxin efflux from axillary buds of intact and decapitated plants without affecting auxin flow in the main stem. Gene expression analyses indicate that NPA and PCIB regulate auxin-inducible, and biosynthesis and transport genes, in axillary buds within 3 h after application. These inhibitors had no effect on initial bud outgrowth after decapitation or cytokinin (benzyladenine; BA) treatment. Inhibitory effects of PCIB and NPA on axillary bud outgrowth only became apparent from 48 h after treatment. These findings demonstrate that the initiation of decapitation-and cytokinin-induced axillary bud outgrowth is independent of auxin canalization and export from the bud.

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Involvement of secondary messengers and small organic molecules in auxin perception and signaling

Cited by 25 publications

References 107 publications

Melatonin and its relationship to plant hormones

Melatonin and its relationship to plant hormones

A Review of Auxin Response Factors (ARFs) in Plants

Initial Bud Outgrowth Occurs Independent of Auxin Flow from Out of Buds

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