Efficient Conversion of L-Tryptophan to Indole-3-Acetic Acid and/or Tryptophol by Some Species of Rhizoctonia

Furukawa, Toshiko; Koga, Jinichiro; Adachi, Takashi; Kishi, Kunihei; Syōno, Kunihiko

doi:10.1093/oxfordjournals.pcp.a029037

Cited by 45 publications

(22 citation statements)

References 24 publications

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“…On the contrary, it enhanced the shoot fresh weight compared to control plants. This increase can probably be ascribed to the hormone synthesis by R. solani isolates (Furukawa et al 1996). A higher root tip number coupled with a reduction of total root length leads to a higher branching degree, as has been shown in other plants infected by pathogens (Trotta et al 1996;Berta et al 2005).…”

Section: Discussionmentioning

confidence: 54%

Interactions between a fluorescent pseudomonad, an arbuscular mycorrhizal fungus and a hypovirulent isolate ofRhizoctonia solaniaffect plant growth and root architecture of tomato plants

Gamalero

Pivato

Bona

et al. 2010

Plant Biosystems - An International Journal Dealing with all As

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Although Rhizoctonia solani is a cosmopolitan soilborne pathogen, the genus includes isolates with different pathogenicity ranging from high virulence to avirulence. The biocontrol strain Pseudomonas fluorescens P190r and the arbuscular mycorrhizal (AM) fungus Glomus mosseae BEG12 were inoculated alone or in combination in tomato plants infested by the mildly virulent pathogen R. solani #235. Plant growth as well as root morphometric and topological parameters were evaluated. The infection of R. solani was significantly reduced by all the combinations of the beneficial microorganisms. Root systems of R. solaniinfected plants were weakly developed but highly branched with a herring-bone pattern, while those inoculated with the AM fungus, alone or in combination with the bacterial strain, were longer and more developed, and displayed a dichotomous pattern. The interactions among these three microorganisms affected plant growth and root architecture of tomato plants.

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Section: Discussionmentioning

confidence: 54%

Interactions between a fluorescent pseudomonad, an arbuscular mycorrhizal fungus and a hypovirulent isolate ofRhizoctonia solaniaffect plant growth and root architecture of tomato plants

Gamalero

Pivato

Bona

et al. 2010

Plant Biosystems - An International Journal Dealing with all As

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“…Cottonwood (Populus trichocarpa) harbours yeasts which are able to enhance seedling growth by producing indol acetic acid, IAA, a plant growth regulator. For producing IAA, the yeast needs L-tryptophan, provided by the host (Furukawa et al 1996).…”

Section: Introductionmentioning

confidence: 99%

Fungal endophytic communities on twigs of fast and slow growing Scots pine ( Pinus sylvestris L.) in northern Spain

et al. 2015

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“…In pathogenic bacteria, IAA production seems to be realized via IAM, whereas plant growth-promoting bacteria prefer the IPA pathway (26)(27)(28). In fungi, IAA synthesis was shown for the basidiomycetes Ustilago maydis (15,29,30), Rhizoctonia (31), and Piriformospora indica (32) and for the ascomycetes Colletotrichum gloeosporioides (33) and Fusarium proliferatum (34).…”

mentioning

confidence: 99%

Biosynthesis and Secretion of Indole-3-Acetic Acid and Its Morphological Effects on Tricholoma vaccinum-Spruce Ectomycorrhiza

Krause

Henke

Asiimwe

et al. 2015

Appl Environ Microbiol

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bFungus-derived indole-3-acetic acid (IAA), which is involved in development of ectomycorrhiza, affects both partners, i.e., the tree and the fungus. The biosynthesis pathway, excretion from fungal hyphae, the induction of branching in fungal cultures, and enhanced Hartig net formation in mycorrhiza were shown. Gene expression studies, incorporation of labeled compounds into IAA, heterologous expression of a transporter, and bioinformatics were applied to study the effect of IAA on fungal morphogenesis and on ectomycorrhiza. Tricholoma vaccinum produces IAA from tryptophan via indole-3-pyruvate, with the last step of this biosynthetic pathway being catalyzed by an aldehyde dehydrogenase. The gene ald1 was found to be highly expressed in ectomycorrhiza and induced by indole-3-acetaldehyde. The export of IAA from fungal cells is supported by the multidrug and toxic extrusion (MATE) transporter Mte1 found in T. vaccinum. The addition of IAA and its precursors induced elongated cells and hyphal ramification of mycorrhizal fungi; in contrast, in saprobic fungi such as Schizophyllum commune, IAA did not induce morphogenetic changes. Mycorrhiza responded by increasing its Hartig net formation. The IAA of fungal origin acts as a diffusible signal, influencing root colonization and increasing Hartig net formation in ectomycorrhiza. F ungi, mainly basidiomycetes, form a mutually beneficial symbiotic association, commonly known as ectomycorrhiza, with the roots of woody plants (1). After establishing contact with the host, the fungus initially grows around the roots to form a mass of mycelium called the fungal mantle. From there, some hyphae penetrate the roots to grow between cortical cells to form the Hartig net, which acts as a surface for the exchange of nutrients and signals between the two symbiotic partners (1). Variation in host specificity occurs within ectomycorrhizal fungi: some have a broad host range, whereas others form host-specific ectomycorrhiza. In contrast to ectomycorrhizal fungi such as Pisolithus tinctorius and Paxillus involutus, Tricholoma species often show host specificity; their fruiting bodies are found only below compatible host trees. For example, Tricholoma vaccinum fruiting bodies occur only near spruce, which is the compatible host (2). Under laboratory conditions, Tricholoma species form ectomycorrhiza with nonhost trees, but the mycorrhization process in such lowcompatibility interactions requires more time and features spotty Hartig net formation (3). Thus, T. vaccinum, a slow-growing, latestage, and highly host-specific mycorrhizal fungus was chosen for the investigation of fungus-derived phytohormone effects on both partners. These interactions were expected to show the importance of indole-3-acetic acid (IAA) in the establishment and functioning of the symbiosis. We hypothesized that a long period of incubation might be necessary to observe changes in the morphogenetic responses that are not easily visualized with fast-growing, early-stage mycorrhiza. In order to generalize our findin...

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Efficient Conversion of L-Tryptophan to Indole-3-Acetic Acid and/or Tryptophol by Some Species of Rhizoctonia

Cited by 45 publications

References 24 publications

Interactions between a fluorescent pseudomonad, an arbuscular mycorrhizal fungus and a hypovirulent isolate ofRhizoctonia solaniaffect plant growth and root architecture of tomato plants

Interactions between a fluorescent pseudomonad, an arbuscular mycorrhizal fungus and a hypovirulent isolate ofRhizoctonia solaniaffect plant growth and root architecture of tomato plants

Fungal endophytic communities on twigs of fast and slow growing Scots pine ( Pinus sylvestris L.) in northern Spain

Biosynthesis and Secretion of Indole-3-Acetic Acid and Its Morphological Effects on Tricholoma vaccinum-Spruce Ectomycorrhiza

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