Indole-3-acetic acid in microbial and microorganism-plant signaling

Spaepen, Stijn; Vanderleyden, Jozef; Remans, Roseline

doi:10.1111/j.1574-6976.2007.00072.x

Cited by 1,576 publications

(1,196 citation statements)

References 214 publications

(312 reference statements)

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“…A biossíntese de auxinas por bactérias acontece por diferentes rotas metabólicas (Spaepen et al, 2007), sendo o triptofano o principal precursor para a síntese de AIA -fato que explica os mais altos valores de indol detectados nos meios de cultivo que tiveram acréscimo de triptofano em relação aos que não o continham (Quadro 2). A biossíntese de fito-hormônios parece ser uma habilidade comum às bactérias diazotróficas, tem sido relatada em estirpes pertencentes aos gêneros Azotobacter (Martínez-Toledo et al, 1988), Rhizobium (Badenoch-Jones et al, 1982), Azospirillum (Martínez-Morales et al, 2003), Gluconacetobacter e Herbaspirillum (Bastián et al, 1998).…”

Section: Discussionunclassified

Seleção de bactérias promotoras de crescimento no abacaxizeiro cultivar Vitória durante a aclimatização

Baldotto¹,

Baldotto²,

Olivares³

et al. 2010

Rev. Bras. Ciênc. Solo

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Section: Discussionunclassified

Seleção de bactérias promotoras de crescimento no abacaxizeiro cultivar Vitória durante a aclimatização

Baldotto¹,

Baldotto²,

Olivares³

et al. 2010

Rev. Bras. Ciênc. Solo

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“…The production of phytohormones is now well-documented by the free living and pathogenic bacterial species. Recently, it has also been suggested that IAA could also be a native signalling molecule in bacteria (Spaepen et al, 2007). The fact that several bacteria can catabolize IAA and use it as a sole source of carbon, nitrogen and energy (Leveau and Lindow, 2005), more information is needed about its possible role as signalling agent in bacteria.…”

Section: Occurrence Of Phytohormones In Bacteria and Fungimentioning

confidence: 99%

Hormonal regulation in green plant lineage families

Johri

2008

Physiol Mol Biol Plants

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The patterns of phytohormones distribution, their native function and possible origin of hormonal regulation across the green plant lineages (chlorophytes, charophytes, bryophytes and tracheophytes) are discussed. The five classical phytohormonesauxins, cytokinins, gibberellins (GA), abscisic acid (ABA) and ethylene occur ubiquitously in green plants. They are produced as secondary metabolites by microorganisms. Some of the bacterial species use phytohormones to interact with the plant as a part of their colonization strategy. Phytohormone biosynthetic pathways in plants seem to be of microbial origin and furthermore, the origin of high affinity perception mechanism could have preceded the recruitment of a metabolite as a hormone. The bryophytes represent the earliest land plants which respond to the phytohormones with the exception of gibberellins. The regulation by auxin and ABA may have evolved before the separation of green algal lineage. Auxin enhances rhizoid and caulonemal differentiation while cytokinins enhance shoot bud formation in mosses. Ethylene retards cell division but seems to promote cell elongation. The presence of responses specific to cytokinins and ethylene strongly suggest the origin of their regulation in bryophytes. The hormonal role of GAs could have evolved in some of the ferns where antheridiogens (compounds related to GAs) and GAs themselves regulate the formation of antheridia.During migration of life forms to land, the tolerance to desiccation may have evolved and is now observed in some of the microorganisms, animals and plants. Besides plants, sequences coding for late embryogenesis abundant-like proteins occur in the genomes of other anhydrobiotic species of microorganisms and nematodes. ABA acts as a stress signal and increases rapidly upon desiccation or in response to some of the abiotic stresses in green plants. As the salt stress also increases ABA release in the culture medium of cyanobacterium Trichormus variabilis, the recruitment of ABA in the regulation of stress responses could have been derived from prokaryotes and present at the level of common ancestor of green plants. The overall hormonal action mechanisms in mosses are remarkably similar to that of the higher plants. As plants are thought to be monophyletic in origin, the existence of remarkably similar hormonal mechanisms in the mosses and higher plants, suggests that some of the basic elements of regulation cascade could have also evolved at the level of common ancestor of plants. The networking of various steps in a cascade or the crosstalk between different cascades is variable and reflects the dynamic interaction between a species and its specific environment.

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“…IAN can be hydrolyzed by nitrilase activity into auxins phenyl acetic acid and IAA. The hydrolysis of IAN into IAA by nitrilase activity is an extremely well characterized reaction in plants and bacteria (Bartel, 1997;Spaepen et al 2007). However, the IAN pathway is one of the several that have been identified for IAA biosynthesis (Chung and Tzeng, 2004).…”

Section: Nitrile Degrading Enzymes and Their Role In Plant Metabolismmentioning

confidence: 99%

Understanding nitrile-degrading enzymes: classification, biocatalytic nature and current applications

Rodríguez¹

2013

Rev Latinoam Biotecnol Ambient Algal

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Nitrile-degrading enzymes commonly known as nitrilase enzymes are able to metabolize nitrile-substituent compounds and they have several industrial applications, for example: in drugs synthesis. It is also common to observe their exploitation for obtaining chemical compounds with commercial interests related to cosmetics production, paints and additives. In addition, these are frequently used in the active metabolites synthesis of pesticides. Due to the catalytic nature of such proteins, it is possible to take advantage of their biotechnological potential to be applied in various scientific fields including synthetic biocatalysis and environmental remediation, since they have been successfully used for soils nitrile-wastes decontamination such as cyanide, bromoxynil and benzonitrile. On the other hand, these enzymes are considered very important intermediaries of metabolic pathways related to indolic compounds that are produced by bacteria, plants and superior fungi, acting in most cases as vegetal growth hormones. Given the fact that indole-derivative molecules play an important role in physiological responses in superior organisms, nitrilase enzymes may be considered as important part of unknown multi-enzymatic secondary metabolites pathways. In light of the above considerations, this review attempts to summarize the current status of nitrilase research and describing in detail the main characteristics of nitrile-converting enzymes with emphasis on fungal proteins, including their function and catalytic selectivity. Likewise, their relationship with plant metabolism and biotechnological importance in bioremediation processes is discussed. Keywords: nitrile-degrading enzymes, indolic compounds, indole-3-acetic acid, cyanide, environmental remediation. ResumenLas enzimas degradadoras de compuestos nitrilo conocidas comúnmente como enzimas nitrilasas, son capaces de metabolizar compuestos nitrilo-sustituyentes, y tienen diversas aplicaciones industriales como por ejemplo: en la síntesis de fármacos. Asimismo, es común observar su explotación para la obtención de compuestos químicos de interés comercial relacionados con la elaboración de cosméticos, pinturas y aditivos. Además, éstas suelen emplearse también de manera frecuente en la síntesis de metabolitos activos de plaguicidas. Debido a la naturaleza catalítica de dichas proteínas, actualmente es posible explotar su potencial biotecnológico para ser aplicado en diversos campos, incluyendo la biocatálisis sintética y remediación ambiental, ya que han sido utilizadas con éxito para la descontaminación de suelos impactados con cianuro, bromoxinil y benzonitrilo. Por otra parte, dichas enzimas son importantes intermediarias de rutas metabólicas de compuestos indólicos producidos por bacterias, plantas y hongos superiores, actuando en la mayoría de los 10.7603/s40 -01 -00 - casos como hormonas de crecimiento vegetal. Debido al hecho de que las moléculas derivadas de compuestos indólicos juegan un papel importante en las respuestas fisiológicas de organismos ...

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Indole-3-acetic acid in microbial and microorganism-plant signaling

Cited by 1,576 publications

References 214 publications

Seleção de bactérias promotoras de crescimento no abacaxizeiro cultivar Vitória durante a aclimatização

Seleção de bactérias promotoras de crescimento no abacaxizeiro cultivar Vitória durante a aclimatização

Hormonal regulation in green plant lineage families

Understanding nitrile-degrading enzymes: classification, biocatalytic nature and current applications

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