Competitive antagonism between IAA and indole alkaloid hypaphorine must contribute to regulate ontogenesis

Jambois, Anne; Dauphin, Aurélien; Kawano, Tomonori; Ditengou, Franck Anicet; Bouteau, François; Legué, Valérie; Lapeyrie, Frédéric

doi:10.1111/j.1399-3054.2005.00474.x

Cited by 29 publications

(13 citation statements)

References 85 publications

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“…2, E and F). Unlike in ericoid mycorrhizas, root hairs are not involved in ECM colonization (Peterson and Massicotte, 2004), and are in the contrary repressed by some ECM fungi (Jambois et al, 2005). Interestingly, Arabidopsis developed longer root hairs in the presence of truffles.…”

Section: Discussionmentioning

confidence: 99%

Truffles Regulate Plant Root Morphogenesis via the Production of Auxin and Ethylene

Splivallo¹,

Fischer²,

Göbel³

et al. 2009

Plant Physiology

174

162

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Truffles are symbiotic fungi that form ectomycorrhizas with plant roots. Here we present evidence that at an early stage of the interaction, i.e. prior to physical contact, mycelia of the white truffle Tuber borchii and the black truffle Tuber melanopsorum induce alterations in root morphology of the host Cistus incanus and the nonhost Arabidopsis (Arabidopsis thaliana; i.e. primary root shortening, lateral root formation, root hair stimulation). This was most likely due to the production of indole-3-acetic acid (IAA) and ethylene by the mycelium. Application of a mixture of the ethylene precursor 1-aminocyclopropane-1-carboxylic acid and IAA fully mimicked the root morphology induced by the mycelium for both host and nonhost plants. Application of the single hormones only partially mimicked it. Furthermore, primary root growth was not inhibited in the Arabidopsis auxin transport mutant aux1-7 by truffle metabolites while root branching was less effected in the ethylene-insensitive mutant ein2-LH. The double mutant aux1-7;ein2-LH displayed reduced sensitivity to fungus-induced primary root shortening and branching. In agreement with the signaling nature of truffle metabolites, increased expression of the auxin response reporter DR5::GFP in Arabidopsis root meristems subjected to the mycelium could be observed, confirming that truffles modify the endogenous hormonal balance of plants. Last, we demonstrate that truffles synthesize ethylene from L-methionine probably through the a-keto-g-(methylthio)butyric acid pathway. Taken together, these results establish the central role of IAA and ethylene as signal molecules in truffle/plant interactions.

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Section: Discussionmentioning

confidence: 99%

Truffles Regulate Plant Root Morphogenesis via the Production of Auxin and Ethylene

Splivallo¹,

Fischer²,

Göbel³

et al. 2009

Plant Physiology

174

162

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“…4B), by analogy to enzymatic analyses known as Lineweaver-Burk plot. The idea for applying LineweaverBurk plot for elucidation of the non-enzymatic biological phenomena in vivo was obtained from earlier works studying the interactions between natural auxin and synthetic (Kawano et al, 2003) or fungal auxins (Jambois et al, 2005) in living plant materials.…”

Section: Simulation Of Light Response Curves (Pi-curves)mentioning

confidence: 99%

Empirical and Simulative Evaluations of White Fluorescence-type Light Emitting Diodes as Algal Growing Light Sources Based on the Photosynthetic Oxygen Evolution by <i>Synechocystis</i> spp. PCC6803

Nagasawa

Iwase

Comparini

et al. 2015

Environmental Control in Biology

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Recently, applications of light-emitting diodes (LEDs) for enhancing the efficiency of photosynthesis have attracted the attentions by many researchers and agriculturalists. In the present study, we proposed both empirical (experimental) and simulative evaluations of chlorophyll-targeting monochromic and white fluorescence-type LEDs as the light sources for algal photosynthesis based on the evolution of O2 by Synechocystis sp. PCC6803.

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“…Interestingly, only a combined exogenous IAA/ethylene treatment, but not each phytohormone alone, was able to fully mimic the effect of fungal signals on root development. A multiplicity of other identified signals (auxins, alkaloids, cytokinins, flavonols, polyamines) have been found to act in either a synergistic (rutine/ zeatine) or antagonistic (IAA/hypaphorine) manner during ECM formation, but to date evidence for their molecular impact on root developmental programs is lacking Martin et al, 2001;Jambois et al, 2005;Martin and Nehls, 2009).…”

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confidence: 99%

The Ectomycorrhizal FungusLaccaria bicolorStimulates Lateral Root Formation in Poplar and Arabidopsis through Auxin Transport and Signaling

et al. 2009

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The early phase of the interaction between tree roots and ectomycorrhizal fungi, prior to symbiosis establishment, is accompanied by a stimulation of lateral root (LR) development. We aimed to identify gene networks that regulate LR development during the early signal exchanges between poplar (Populus tremula 3 Populus alba) and the ectomycorrhizal fungus Laccaria bicolor with a focus on auxin transport and signaling pathways. Our data demonstrated that increased LR development in poplar and Arabidopsis (Arabidopsis thaliana) interacting with L. bicolor is not dependent on the ability of the plant to form ectomycorrhizae. LR stimulation paralleled an increase in auxin accumulation at root apices. Blocking plant polar auxin transport with 1-naphthylphthalamic acid inhibited LR development and auxin accumulation. An oligoarray-based transcript profile of poplar roots exposed to molecules released by L. bicolor revealed the differential expression of 2,945 genes, including several components of polar auxin transport (PtaPIN and PtaAUX genes), auxin conjugation (PtaGH3 genes), and auxin signaling (PtaIAA genes). Transcripts of PtaPIN9, the homolog of Arabidopsis AtPIN2, and several PtaIAAs accumulated specifically during the early interaction phase. Expression of these rapidly induced genes was repressed by 1-naphthylphthalamic acid. Accordingly, LR stimulation upon contact with L. bicolor in Arabidopsis transgenic plants defective in homologs of these genes was decreased or absent. Furthermore, in Arabidopsis pin2, the root apical auxin increase during contact with the fungus was modified. We propose a model in which fungus-induced auxin accumulation at the root apex stimulates LR formation through a mechanism involving PtaPIN9-dependent auxin redistribution together with PtaIAA-based auxin signaling.Most temperate forest trees develop a mutualistic root symbiosis with ectomycorrhizal soil fungi. During the establishment of ectomycorrhiza (ECM), fungal hyphae invade the root from root cap cells in and upwards to the epidermis (Horan et al., 1988). After attachment to epidermal cells, hyphae multiply to form a series of layers that differentiate to establish a mantle structure around the root (Horan et al., 1988). An internal network of hyphae between the epidermis and root cortex cells forms the Hartig net (Blasius et al., 1986), while extraradical hyphae prospect throughout the surrounding soil and gather nutrients. Morphological observations of forming ECMs have shown that in the vicinity of the fungus the root architecture of the host plant is profoundly modified. Interaction with hyphae stimulates lateral root (LR) formation, dichotomy of the root apical meristem in conifer species, and cytodifferentiation of root cells (radial elongation and root hair decay; Horan et al., 1988;Dexheimer and Pargney, 1991;. Even though several studies have focused on LR stimulation during ECM formation, it still remains unclear what the molecular mechanisms are that modify root development during contact with the fungus.In the ...

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Competitive antagonism between IAA and indole alkaloid hypaphorine must contribute to regulate ontogenesis

Abstract: Abbreviations -ACC, 1-aminocyclopropane-1-carboxylic acid; IAA, indole-3-acetic acid.

Cited by 29 publications

References 85 publications

Truffles Regulate Plant Root Morphogenesis via the Production of Auxin and Ethylene

Truffles Regulate Plant Root Morphogenesis via the Production of Auxin and Ethylene

Empirical and Simulative Evaluations of White Fluorescence-type Light Emitting Diodes as Algal Growing Light Sources Based on the Photosynthetic Oxygen Evolution by <i>Synechocystis</i> spp. PCC6803

The Ectomycorrhizal FungusLaccaria bicolorStimulates Lateral Root Formation in Poplar and Arabidopsis through Auxin Transport and Signaling

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