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Genomics and Effectomics of the Crop Killer Xanthomonas

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Book Series: Frontiers Research Topics ISSN: 16648714 ISBN: 9782889199020 Year: Pages: 158 DOI: 10.3389/978-2-88919-902-0 Language: English
Publisher: Frontiers Media SA
Subject: Science (General) --- Botany
Added to DOAB on : 2016-01-19 14:05:46
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Abstract

Phytopathogenic bacteria of the Xanthomonas genus cause severe diseases on hundreds of host plants, including economically important crops, such as bean, cabbage, cassava, citrus, hemp, pepper, rice, sugarcane, tomato or wheat. Diseases occurring in nature comprise bacterial blight, canker, necrosis, rot, scald, spot, streak or wilt. Xanthomonas spp. are distributed worldwide and pathogenic and nonpathogenic strains are essentially found in association to plants. Some phytopathogenic strains are emergent or re-emergent and, consequently, dramatically impact agriculture, economy and food safety. During the last decades, massive efforts were undertaken to decipher Xanthomonas biology. So far, more than one hundred complete or draft genomes from diverse Xanthomonas species have been sequenced (http://www.xanthomonas.org), thus providing powerful tools to study genetic determinants triggering pathogenicity and adaptation to plant habitats. Xanthomonas spp. employ an arsenal of virulence factors to invade its host, including extracellular polysaccharides, plant cell wall-degrading enzymes, adhesins and secreted effectors. In most xanthomonads, type III secretion (T3S) system and secreted effectors (T3Es) are essential to bacterial pathogenicity through the inhibition of plant immunity or the induction of plant susceptibility (S) genes, as reported for Transcription Activation-Like (TAL) effectors. Yet, toxins can also be major virulence determinants in some xanthomonads while nonpathogenic Xanthomonas species do live in sympatry with plant without any T3S systems nor T3Es. In a context of ever increasing international commercial exchanges and modifications of the climate, monitoring and regulating pathogens spread is of crucial importance for food security. A deep knowledge of the genomic diversity of Xanthomonas spp. is required for scientists to properly identify strains, to help preventing future disease outbreaks and to achieve knowledge-informed sustainable disease resistance in crops. This Research Topic published in the ‘Plant Biotic Interactions’ section of Frontiers in Plant Science and Frontiers in Microbiology aims at illustrating several of the recent achievements of the Xanthomonas community. We collected twelve manuscripts dealing with comparative genomics or T3E repertoires, including five focusing on TAL effectors which we hope will contribute to advance research on plant pathogenic bacteria.

Jasmonic Acid Pathway in Plants

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ISBN: 9783039284887 / 9783039284894 Year: Pages: 346 DOI: 10.3390/books978-3-03928-489-4 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Biology --- Plant Sciences
Added to DOAB on : 2020-06-09 16:38:57
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The plant hormone jasmonic acid (JA) and its derivative, an amino acid conjugate of JA (jasmonoyl isoleucine, JA-Ile), are signaling compounds involved in the regulation of defense and development in plants. The number of articles studying on JA has dramatically increased since the 1990s. JA is recognized as a stress hormone that regulates the plant response to biotic stresses such as herbivore and pathogen attacks, as well as abiotic stresses such as wounding and ultraviolet radiation. Recent studies have remarkably progressed the understanding of the importance of JA in the life cycle of plants. JA is directly involved in many physiological processes, including stamen growth, senescence, and root growth. JA regulates production of various metabolites such as phytoalexins and terpenoids. Many regulatory proteins involved in JA signaling have been identified by screening for Arabidopsis mutants. However, much more remains to be learned about JA signaling in other plant species. This Special Issue, “Jasmonic Acid Pathway in Plants”, contains 5 review and 15 research articles published by field experts. These articles will help with understanding the crucial roles of JA in its response to the several environmental stresses and development in plants.

Keywords

albino --- aroma --- Camellia sinensis --- chloroplast --- jasmonic acid --- light-sensitive --- stress --- tea --- volatile --- Panax ginseng --- gene expression --- ginsenoside --- methyl jasmonate --- MYB transcription factor --- dammarenediol synthase --- jasmonic acid --- signaling pathway --- environmental response --- biological function --- MeJA --- priming --- rice --- proteomics --- ROS --- chlorophyll fluorescence imaging --- MAP kinase --- jasmonate --- rice bacterial blight --- salicylic acid --- grain development --- Prunus avium --- Tuscan varieties --- jasmonic acid --- lipoxygenase --- bioinformatics --- gene expression --- heterotrimeric G proteins --- AtRGS1 --- jasmonates --- endocytosis --- diffusion dynamics --- Chinese flowering cabbage --- leaf senescence --- JA --- transcriptional activation --- adventitious rooting --- auxin --- ectopic metaxylem --- ectopic protoxylem --- ethylene --- hypocotyl --- jasmonates --- nitric oxide --- xylogenesis --- transcriptional regulators --- plant development --- jasmonic acid signaling --- gene expression --- Jasmonate-ZIM domain --- JAZ repressors --- Jas domain --- TIFY --- degron --- phylogenetic analysis --- ancestral sequences --- circadian clock --- jasmonic acid --- crosstalk --- jasmonic acid --- fatty acid desaturase --- multiseeded --- msd --- grain number --- MutMap --- sorghum --- Ralstonia solanacearum --- type III effector --- jasmonic acid --- salicylic acid --- Nicotiana plants --- PatJAZ6 --- jasmonic acid (JA) signaling pathway --- Pogostemon cablin --- patchouli alcohol --- biosynthesis --- jasmonate --- salt response --- Zea mays --- ROS --- proline --- ABA biosynthesis --- jasmonic acid --- crosstalk --- gibberellic acid --- cytokinin --- auxin --- jasmonic acid --- opr3 --- stress defense --- quantitative proteomics --- abiotic stresses --- jasmonates --- JA-Ile --- JAZ repressors --- transcription factor --- signaling --- antioxidant enzyme activity --- elicitor --- methyl jasmonate --- secondary metabolite --- signal molecules --- n/a

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