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This work was supported by the European Research Council Advanced Grant(ETAP-742985 to *** J.F.)and by the Ministry of Science and Technology(grant 110-2636-B-005-001 to K.-J.L.).

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Plant Communications 2024年第1期5卷 130-147页

作者： Yu Zhang Yuan Fu Wenfei Xian Xiuli Li Yong Feng Fengjiao Bu Yan Shi Shiyu Chen Robin van Velzen Kai Battenberg Alison M.Berry Marco G.Salgado Hui Liu Tingshuang Yi Pascale Fournier Nicole Alloisio Petar Pujic Hasna Boubakri M.Eric Schranz Pierre-Marc Delaux Gane Ka-Shu Wong Valerie Hocher Sergio Svistoonoff Hassen Gherbi ertao wang.wouter kohlen Luis G.Wall Martin Parniske Katharina Pawlowski Philippe Normand Jeffrey J.Doyle Shifeng Cheng Shenzhen Branch Guangdong Laboratory for Lingnan Modern AgricultureGenome Analysis Laboratory of the Ministry of AgricultureAgricultural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhen 518124China Biosystematics Group Department of Plant SciencesWageningen University6708PB Wageningenthe Netherlands Department of Plant Sciences University of CaliforniaDavisDavisCA 95616USA Department of Ecology Environment and Plant SciencesStockholm University10691 StockholmSweden Germplasm Bank of Wild Species Kunming Institute of BotanyChinese Academy of SciencesLanhei RoadKunming 650201China Universite´de Lyon Universite´Lyon 1CNRSUMR5557Ecologie MicrobienneINRAUMR 141843 bd du 11 novembre 191869622 VilleurbanneFrance Laboratoire de Recherche en Sciences Ve´ge´tales(LRSV) Universite´de ToulouseCNRSUPS24 chemin de Borde RougeAuzevilleBP4261731326 Castanet TolosanFrance Department of Biological Sciences University of AlbertaEdmontonAB T6G 2E9Canada French National Research Institute for Sustainable Development(IRD) UMR LSTM(IRD/CIRAD/INRAe/Montpellier University/Supagro)-Campus International BaillarguetTA A-82/J34398 Montpellier Cedex 5France National Key Laboratory of Plant Molecular Genetics CAS Center for Excellence in Molecular Plant SciencesInstitute of Plant Physiology and EcologySIBSChinese Academy of SciencesShanghaiChina Laboratory of Molecular Biology Department of Plant SciencesWageningen University6708PB Wageningenthe Netherlands Laboratory of Biochemistry Microbiology and Soil Biological InteractionsDepartment of Science and TechnologyNational University of QuilmesCONICETBernalArgentina Faculty of Biology GeneticsLMU MunichGroßhaderner Strasse 2-482152 MartinsriedGermany School of Integrative Plant Science Sections of Plant Biology and Plant Breeding&GeneticsCornell UniversityIthacaNY 14853USA State Key Laboratory of Systematic and Evolutionary Botany Institute of BotanyChinese Academy of SciencesBeijing 100093China Univer

Plant root-nodule symbiosis(RNS)with mutualistic nitrogen-fixing bacteria is restricted to a single clade of angiosperms,the Nitrogen-Fixing Nodulation Clade(NFNC),and is best understood in the legume *** species share many commonalities,explained either by divergence from a common ancestor over 100 million years ago or by convergence following independent origins over that same time ***,comparative analyses of diverse nodulation syndromes can provide insights into constraints on nodulation—what must be acquired or cannot be lost for a functional symbiosis—and the latitude for Plant Communications Genomic landscape of nodulation variation in the ***,much remains to be learned about nodulation,especially outside of ***,we employed a large-scale phylogenomic analysis across 88 species,complemented by 151 RNA-seq libraries,to elucidate the evolution of *** phylogenomic analyses further emphasize the uniqueness of the transcription factor NIN as a master regulator of nodulation and identify key muta-tions that affect its function across the *** transcriptomic assessment revealed nodule-specific upregulated genes across diverse nodulating plants,while also identifying nodule-specific and nitrogen-response *** 70%of symbiosis-related genes are highly conserved in the four representative species,whereas defense-related and host-range restriction genes tend to be lineage *** study also identified over 900000 conserved non-coding elements(CNEs),over 300000 of which are unique to sampled NFNC ***-specific CNEs are enriched with the active H3K9ac mark and are correlated with accessible chromatin regions,thus representing a pool of candidate regula-tory elements for genes involved in ***,our results provide novel insights into the evolution of nodulation and lay a foundation for engineering of RNS traits in agriculturally important crops.

关键词： nitrogen-fixing root-nodule symbiosis two competing hypotheses phylogenomics phylotranscrip-tomics conserved non-coding elements convergence deep homology

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Rhizobium Lipo-chitooligosaccharide Signaling Triggers Accumulation of Cytokinins in Medicago truncatula Roots

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Molecular Plant 2015年第8期8卷 1213-1226页

作者： Arjan van Zeijl Rik H.M. Op den Camp Eva E. Deinum Tatsiana Charnikhova Henk Franssen Huub J.M. Op den Camp Harro Bouwmeester wouter kohlen Ton Bisseling Rene Geurts Department of Plant Sciences Laboratory of Molecular Biology Wageningen University Droevendaalsesteeg 16708 PB Wageningen The Netherlands Department of Systems Biophysics FOM institute AMOLF Science Park 104 1098 XG Amsterdam The Netherlands Department of Plant Sciences Laboratory of Plant Physiology Wageningen University Droevendaalsesteeg 1 6708 PB Wageningen The Netherlands Department of Microbiology IWWR Radboud University Nijmegen Heyendaalseweg 135 6525 AJ Nijmegen The Netherlands College of Science King Saud University Post Office Box 2455 Riyadh 11451 Saudi Arabia

Legume rhizobium symbiosis is initiated upon perception of bacterial secreted lipo-chitooligosaccharides （LCOs）. Perception of these signals by the plant initiates a signaling cascade that leads to nodule formation. Several studies have implicated a function for cytokinin in this process. However, whether cytokinin accu- mulation and subsequent signaling are an integral part of rhizobium LCO signaling remains elusive. Here, we show that cytokinin signaling is required for the majority of transcriptional changes induced by rhizo- bium LCOs. In addition, we demonstrate that several cytokinins accumulate in the root susceptible zone 3 h after rhizobium LCO application, including the biologically most active cytokinins, trans-zeatin and iso- pentenyl adenine. These responses are dependent on calcium- and calmodulin-dependent protein kinase （CCaMK）, a key protein in rhizobial LCO-induced signaling. Analysis of the ethylene-insensitive Mtein21 Mtsickle mutant showed that LCO-induced cytokinin accumulation is negatively regulated by ethylene. Together with transcriptional induction of ethylene biosynthesis genes, it suggests a feedback loop negatively regulating LCO signaling and subsequent cytokinin accumulation. We argue that cytokinin accumulation is a key step in the pathway leading to nodule organogenesis and that this is tightly controlled by feedback loops.

关键词： Medicago truncatula cytokinin ethylene rhizobium lipo-chitooligosaccharides CRE1

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