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The WAK-like protein RFO1 acts as a sensor of the pectin methylation status in Arabidopsis cell walls to modulate root growth and defense

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Molecular Plant 2023年第5期16卷 865-881页

作者： Apolonio I.Huerta Gloria Sancho-Andre´s Juan Carlos Montesinos Javier Silva-Navas Sole`ne Bassard Corinne Pau-Roblot Christopher Kesten Rudolf Schlechter Susanne Dora Temurkhan Ayupov je´rome pelloux^ Julia Santiago Clara Sa´nchez-Rodrı´guez ETH Zurich Institute of Molecular Plant Biology(D-BIOL)ZurichSwitzerland University of Lausanne Department of Plant Molecular BiologyLausanneSwitzerland UMRT INRAE 1158 BioEcoAgro–BIOPI Biologie des Plantes et Innovation Universite´de Picardie33 Rue St Leu80039 AmiensFrance Present address:Lonza AG VispVisSwitzerland Present address:Institute of Microbiology Freie Universitat BerlinBerlinGermany Present address:Institute of Molecular and Clinical Ophthalmology-Basel BaselSwitzerland Present address:Centro de Biotecnologı´a y Geno´mica de Plantas Universidad Polite´cnica de Madrid(UPM)–Instituto Nacional de Investigacio´n y Tecnologı´a Agraria y Alimentaria(INIA/CSIC)Campus de Montegancedo UPM28223 Pozuelo de Alarco´nSpain

Most organisms adjust their development according to the environmental conditions.For the majority,this implies the sensing of alterations to cell walls caused by different cues.Despite the relevance of this process,few molecular players involved in cell wall sensing are known and characterized.Here,we show that the wall-associated kinase-like protein RESISTANCE TO FUSARIUM OXYSPORUM 1(RFO1)is required for plant growth and early defense against Fusarium oxysporum and functions by sensing changes in the pectin methylation levels in the cell wall.The RFO1 dwell time at the plasma membrane is affected by the pectin methylation status at the cell wall,regulating MITOGEN-ACTIVATED PROTEIN KINASE and gene expression.We show that the extracellular domain of RFO1 binds de-methylated pectin in vitro,whose distribution in the cell wall is altered during F.oxysporum infection.Further analyses also indicate that RFO1 is required for the BR-dependent plant growth alteration in response to inhibition of pectin de-methyl-esterase activity at the cell wall.Collectively,our work demonstrates that RFO1 is a sensor of the pectin methylation status that plays a unique dual role in plant growth and defense against vascular pathogens.

关键词： alterations walls pectin

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Homogalacturonan MethyI-Esterification and Plant Development

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Molecular Plant 2009年第5期2卷 851-860页

作者： Sebastian Wolf Gregory Mouille jerome pelloux Heidelberg Institute for Plant Science Im Neuenheimer Feld 360 69120 Heidelberg Germany Laboratoire de Biologie Cellulaire Institut Jean-Pierre Bourgin INRA Centre de Versailles-Grignon Route de St Cyr 78026 Versailles France EA3900-BioPI Biologie des Plantes et contrble des Insectes ravageurs Universite de Picardie 33 Rue St Leu 80039 Amiens France

The ability of a plant cell to expand is largely defined by the physical constraints imposed by its cell wall. Accordingly, cell wall properties have to be regulated during development. The pectic polysaccharide homogalacturonan is a major component of the plant primary walls. Biosynthesis and in muro modification of homogalacturonan have recently emerged as key determinants of plant development, controlling cell adhesion, organ development, and phyllotactic patterning. This review will focus on recent findings regarding impact of homogalacturonan content and methylesterification status of this polymer on plant life. Demethyl-esterification of homogalacturonan occurs through the action of the ubiquitous enzyme ＇pectin methyl-esterase＇. We here describe various strategies developed by the plant to finely tune the methyl-esterification status of homogalacturonan along key events of the plant lifecycle.

关键词： Carbohydrate metabolism cell walls Arabidopsis Pectin.

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New insights into diet breadth of polyphagous and oligophagous aphids on two Arabidopsis ecotypes

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Insect Science 2019年第4期26卷 753-769页

作者： Christopher Wattier Amelie Turbant Lisa Sargos-Vallade jerome pelloux Christine Rusterucci Anas Cherqui CRRBM (Centre de Ressources Regionales en Biologie Moleculaire) Universite de Picardie Jules Verne Amiens Cedex France EA 3900 BIOPI (Biologie des Plantes et Innovation) Universite de Picardie Jules Verne Amiens Cedex France FRE CNRS 3498 EDYSAN (Ecologie et Dynamique des Systemes Anthropises) University de Picardie Jules Verne Amiens Cedex France

We investigated whether plant ecotype might affect aphid performance and behavioi. The probing behaviors of the polyphagous aphid Myzus persicae and the oligophagous aphid Brevicoryne brassicae on two ecotypes of Arabidopsis thaliana, WS and Col-0 were recorded using the direct current electrical penetration graph method (DC-EPG). Myzus persicae displayed a significant preference for the WS ecotype but was not greatly disturbed on Col-0, while B. brassicae discriminated between the two A. thaliana ecotypes, feeding less on WS than on Col-0. A Principal Component Analysis of aphid probing behavior data recorded on Col-0 and WS ecotypes showed that the one of M. persicae was positively correlated with the phloem ingestion phases while the one of B. brassicae was more related to nonfeeding phase. The survival of the aphid species was followed during early larval stages on the two ecotypes and a significantly higher mortality was observed of B. brassicae neonates compared to M. persicae. Both reared on WS. Moreover, transcriptomic analysis of non infested plant leaves from both ecotypes was monitored and underlined constitutive differences between Col-0 and WS gene expression that might explain the different aphid behaviors. Among a unigene set comprising 39 042 sequences for A. thaliana, 6% were differently expressed affecting, for example, the secondary metabolites and cell wall pathways: two third upregulated in WS and one third upregulated in Col-0. Thus, the "ecotype” variable should be taken into account when setting up a plant-insect experimental research.

关键词： Arabidopsis thaliana Brevicoryne brassicae ecotypes EPG microarray Myzus persicae

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Thermomechanical Fatigue Behaviour of a Nickel Base Superalloy

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Journal of Materials Science & Technology 1989年第1期5卷 1-7页

作者：梁晋 R.M.pelloux 谢锡善 Univiersity of Science and Technology Beijing formely Beijing Univiersity of Iron and Steel Technology 100083 China MIT Cambridge MA 02139 USA. Univiersity of Science and Technology Beijing (formely Beijing Univiersity of Iron and Steel Technoloqy) 100083 China.

The isothermal low cycle fatigue (LCF) and thermomechanical fatigue (TMF) behaviour of a Ni-base superalloy was investigated. The results show that temperature plays an important role in both LCF and TMF. The alloy shows the lowest LCF fatigue resistance in the intermediate temperature range (～760℃). For strain-controlled TMF, in-phase (IP) cycling is more damaging than out-phase (OP) cycling. The high tempera- ture exposure in the TMF cycling influences the deformation behaviour at the low temperature. LCF lives at different temperatures, and IP and OP TMF lives are successfully correlated by using the hysteresis parameter Δσ·Δε_p.

关键词： Ni-base superalloy low cycle fatigue thermomechanical fatigue.

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