The Role of Auxin in Root-Symbiont and Root-Pathogen Interactions: From Development to Defense

Mathesius, Ulrike

doi:10.1007/978-3-642-02167-1_8

Cited by 6 publications

(4 citation statements)

References 167 publications

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“…TDC catalyzes conversion from tryptophan to tryptamine, and tryptamine is a precursor for the biosynthesis of IAA ( Dubouzet et al, 2013 ). Except for regulation of plant development, IAA also involves in plant defense to biotic stress and abiotic stress ( Mathesius, 2010 ; Navarro, 2016 ).…”

Section: Resultsmentioning

confidence: 99%

“…Plant hormone IAA biosynthesis has several main pathways from Trp, respectively catalyzed by TDC, YUCCA, and NIT ( Sugawara et al, 2009 ; Zhao, 2010 ). It is well-known that auxin always regulates plant defense as a negative regulator in plant immune system ( Mathesius, 2010 ; Navarro, 2016 ). A series of evidence has demonstrated that auxin plays roles in balancing plant defense responses and growth in plants.…”

Section: Discussionmentioning

confidence: 99%

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The Tryptophan decarboxylase 1 Gene From Aegilops variabilis No.1 Regulate the Resistance Against Cereal Cyst Nematode by Altering the Downstream Secondary Metabolite Contents Rather Than Auxin Synthesis

Huang

Zheng

et al. 2018

Front. Plant Sci.

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Cereal cyst nematode (CCN, Heterodera avenae) is a most important pathogen of wheat and causes tremendous yield loss annually over the world. Since the lack of resistance materials among wheat cultivars, identification and characterization of the resistance-related genes from the relatives of wheat is a necessary and efficient way. As a close relative of wheat with high resistance against CCN, Aegilops variabilis No.1 is believed to be a valuable source for wheat breeding against this devastating disease. However so far, very few resistance-associated genes have been characterized from this species. In this study, we present that the tryptophan decarboxylase genes from Ae. variabilis No.1 (AeVTDC1 and AeVTDC2) were both induced by CCN juveniles at the early stage of resistance response (30 h post-inoculation), with AeVTDC1 more sensitive to CCN infection than AeVTDC2. Silencing of AeVTDC1 led to compromised immunity to CCN with more CCN intrusion into roots; while overexpression AeVTDC1 in Nicotiana tabacum dramatically enhanced the resistance of plants by reducing the knots formed on roots. Metabolism analysis showed that the contents of secondary metabolites with activity of resistance to varied pathogens correlated with the expression level of AeVTDC1 in both Ae. variabilis No.1 and the transgenic tobacco plants. In addition, the content of IAA was not affected by either silencing or overexpressing of AeVTDC1. Hence, our research provided AeVTDC1 a valuable target that mediates resistance to CCN and root knot nematode (RKN, Meloidogyne naasi) without influencing the auxin biosynthesis.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

The Tryptophan decarboxylase 1 Gene From Aegilops variabilis No.1 Regulate the Resistance Against Cereal Cyst Nematode by Altering the Downstream Secondary Metabolite Contents Rather Than Auxin Synthesis

Huang

Zheng

et al. 2018

Front. Plant Sci.

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“…Recent studies (for a review, see Spoel and Dong 2008) have highlighted that the perturbation of auxin homeostasis is a common virulence mechanism, as many pathogens can synthesize auxin‐like molecules. This situation may impact directly on auxin biosynthesis, accumulation and metabolism, and alter auxin transport (Mathesius, 2010), eventually acting by suppressing the host defence responses that are mediated by salicylic acid (SA) (Wang et al ., 2007). Although our results show the involvement of auxin in the response of the plant to viroid infection, none of the mechanisms suggested by Spoel and Dong (2008) seem to be involved in CEVd or other viroids.…”

Section: Discussionmentioning

confidence: 99%

Microarray analysis of Etrog citron (Citrus medica L.) reveals changes in chloroplast, cell wall, peroxidase and symporter activities in response to viroid infection

Rizza

Conesa

Juárez

et al. 2012

Molecular Plant Pathology

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Viroids are small (246-401 nucleotides), single-stranded, circular RNA molecules that infect several crop plants and can cause diseases of economic importance. Citrus are the hosts in which the largest number of viroids have been identified. Citrus exocortis viroid (CEVd), the causal agent of citrus exocortis disease, induces considerable losses in citrus crops. Changes in the gene expression profile during the early (pre-symptomatic) and late (post-symptomatic) stages of Etrog citron infected with CEVd were investigated using a citrus cDNA microarray. MaSigPro analysis was performed and, on the basis of gene expression profiles as a function of the time after infection, the differentially expressed genes were classified into five clusters. FatiScan analysis revealed significant enrichment of functional categories for each cluster, indicating that viroid infection triggers important changes in chloroplast, cell wall, peroxidase and symporter activities.

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“…The regulation of IAA production in rhizobacteria occurs through the signaling molecules of acyl-homoserine lactones (AHLs) that alter the gene expression of auxins in the host plant and increase its endogenous content (Mathesius et al 2003). Therefore, there is a change in the hormone balance, which alters the development of the roots (Mathesius, 2010). …”

Section: Discussionmentioning

confidence: 99%

Rooting and acclimatization of micropropagated marubakaido apple rootstock using Adesmia latifolia rhizobia

Muniz

Dalagnol

et al. 2013

SpringerPlus

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In vitro rooting and the acclimatization of micropropagated rootstocks of apple trees is essential for plant development in the field. The aim of this work was to assess the use of rhizobia of Adesmia latifolia to promote rooting and acclimatization in micropropagated Marubakaido apple rootstock. An experiment involving in vitro rooting and acclimatization was performed with four strains of rhizobium and two controls, one with and the other without the addition of synthetic indoleacetic acid. The inoculated treatments involved the use of sterile inoculum and inoculum containing live rhizobia. The most significant effects on the rooting rate, primary-root length, number of roots, root length, fresh-shoot biomass, and fresh-root biomass were obtained by inoculation with strain EEL16010B and with synthetic indole acetic acid. However, there was no difference in the growth of apple explants in the acclimatization experiments. Strain EEL16010B can be used to induce in vitro rooting of the Marubakaido rootstock and can replace the use of synthetic indoleacetic acid in the rooting of this cultivar.

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The Role of Auxin in Root-Symbiont and Root-Pathogen Interactions: From Development to Defense

Cited by 6 publications

References 167 publications

The Tryptophan decarboxylase 1 Gene From Aegilops variabilis No.1 Regulate the Resistance Against Cereal Cyst Nematode by Altering the Downstream Secondary Metabolite Contents Rather Than Auxin Synthesis

The Tryptophan decarboxylase 1 Gene From Aegilops variabilis No.1 Regulate the Resistance Against Cereal Cyst Nematode by Altering the Downstream Secondary Metabolite Contents Rather Than Auxin Synthesis

Microarray analysis of Etrog citron (Citrus medica L.) reveals changes in chloroplast, cell wall, peroxidase and symporter activities in response to viroid infection

Rooting and acclimatization of micropropagated marubakaido apple rootstock using Adesmia latifolia rhizobia

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