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Molecular Plant-microbe Interactions: MPMI

Tina Kyndt, Henok Zemene Yimer, Ashley Haeck, Richard Raj Singh, David Devleesschauwer, Simon Denil, Tim De Meyer, Monica Höfte, Kristof Demeestere, Godelieve Gheysen
Magnaporthe oryzae (rice blast) and the root-knot nematode Meloidogyne graminicola are causing two of the most important pathogenic diseases jeopardizing rice production. Here, we show that root-knot nematode infestation on rice roots leads to important above-ground changes in plant immunity gene expression, which is correlated with significantly enhanced susceptibility to blast disease. A detailed metabolic analysis of oxidative stress responses and hormonal balances demonstrates that the above-ground tissues have a disturbed oxidative stress level, with accumulation of H2O2, as well as hormonal disturbances...
February 2, 2017: Molecular Plant-microbe Interactions: MPMI
Yan Xie, Shijuan Han, Xiaoning Li, Erick Amombo, Jinmin Fu
There is considerable evidence that plants' abiotic-stress tolerance can be evoked by the exploitation of globally abundant microbe. A.aculeatus, which was initially isolated from the rhizosphere of bermudagrass, has been shown to increase heavy metal tolerance in turfgrasses. Here, we report on the potential of A.aculeatus to induce tolerance to salt stress in bermudagrass. Physiological markers for salt stress, such as plant growth rate, lipid peroxidation, photosynthesis and ionic homeostasis were assessed...
January 30, 2017: Molecular Plant-microbe Interactions: MPMI
Javier Palma-Guerrero, Xin Ma, Stefano F F Torriani, Marcello Zala, Carolina Sardinha Francisco, Fanny Elisabeth Hartmann, Daniel Croll, Bruce A McDonald
Zymoseptoria tritici is an ascomycete fungus that causes Septoria tritici blotch, a globally distributed foliar disease on wheat. Z. tritici populations are highly polymorphic and exhibit significant quantitative variation for virulence. Despite its importance, the genes responsible for quantitative virulence in this pathogen remain largely unknown. We investigated the expression profiles of four Z. tritici strains differing in virulence in an experiment conducted under uniform environmental conditions. Transcriptomes were compared at four different infection stages to characterize the regulation of gene families thought to be involved in virulence and to identify new virulence factors...
January 25, 2017: Molecular Plant-microbe Interactions: MPMI
Tania Timmermann, Grace Armijo, Raúl A Donoso, Aldo Seguel, Loreto Holuigue, Bernardo Gonzalez
Paraburkholderia phytofirmans PsJN is a plant growth-promoting rhizobacterium (PGPR) that stimulates plant growth and improves tolerance to abiotic stresses. This study analyzed whether strain PsJN can reduce plant disease severity and proliferation of the virulent strain Pseudomonas syringae pv tomato (Pst) DC3000 in Arabidopsis plants, through the activation of induced resistance. Arabidopsis plants previously exposed to strain PsJN showed a reduction in disease severity and pathogen proliferation in leaves compared to non-inoculated, infected plants...
January 24, 2017: Molecular Plant-microbe Interactions: MPMI
Stefan Kusch, Ralph Panstruga
Loss-of-function mutations of the appropriate Mildew resistance locus o (Mlo) gene(s) are an apparently reliable "weapon" to protect plants from infection by powdery mildew fungi, as they confer durable broad-spectrum resistance. Originally detected as a natural mutation in an Ethiopian barley landrace, this so-called mlo-based resistance has been successfully employed in European barley agriculture for more than four decades. More recently, mlo-mediated resistance was discovered to be inducible in virtually every plant species of economical or scientific relevance...
January 17, 2017: Molecular Plant-microbe Interactions: MPMI
Anne-Emmanuelle Hay De-Bettignies, Hasna Boubakri, Antoine Buonomo, Marjolaine Rey, Guillaume Meiffren, Laetitia Cotin-Galvan, Gilles Comte, Aude Herrera-Belaroussi
A unique case of microbial symbiont capable of dormancy within its living host cells has been reported in actinorhizal symbioses: some Frankia strains, named Sp+, are able to sporulate inside plant cells, contrarily to Sp- strains. The presence of metabolically slowed down bacterial structures in host cells alters our understanding of symbiosis based on reciprocal benefits between both partners, and its impact on the symbiotic processes remains unknown. The present work reports a metabolomic study of Sp+ and Sp- nodules (from Alnus glutinosa), in order to highlight variabilities associated with in-planta sporulation...
January 10, 2017: Molecular Plant-microbe Interactions: MPMI
Yasuyuki Kawaharada, Euan K James, Simon Kelly, Niels Sandal, Jens Stougaard
Several hundred genes are transcriptionally regulated during infection thread formation and development of nitrogen fixing root nodules. We have characterized a set of Lotus japonicus mutants impaired in root nodule formation and found that the causative gene, Ern1, encodes a protein with a characteristic APETALA2/Ethylene Responsive Factor (AP2/ERF) transcription factor domain. Phenotypic characterisation of four ern1 alleles shows that infection pockets are formed but root hair infection threads are absent...
January 9, 2017: Molecular Plant-microbe Interactions: MPMI
Dianna V Bourassa, Elmar Kannenberg, Janine Sherrier, Richard Jeffrey Buhr, Russell Carlson
Rhizobium bacteria live in soil and plant environments, are capable of inducing symbiotic nodules on legumes, invade these nodules, and develop into bacteroids that fix atmospheric nitrogen into ammonia. Rhizobial lipopolysaccharide (LPS) is anchored in the bacterial outer membrane through a specialized lipid A containing a very long chain fatty acid (VLCFA). VLCFA function for rhizobial growth in soil and plant environments is not well understood. Two genes, acpXL and lpxXL, encoding acyl carrier protein and acyltransferase, are among the six genes required for biosynthesis and transfer of VLCFA to lipid A...
January 5, 2017: Molecular Plant-microbe Interactions: MPMI
Jeffrey Ellis
In this commentary I question the wisdom and efficacy of studies seeking disease attenuating microbes and microbiomes only in healthy plant communities and posit the alternative view that success in biocontrol of crop diseases may come also come from studies of microbiota, or at least individual species isolates, associated with diseased plants. In support of this view I summarise the current extensive knowledge of the biology behind what is probably the most successful biocontrol of a plant disease, namely the biocontrol of crown gall of stone fruit using non-pathogenic Rhizobium rhizogenes strain K84 (New and Kerr, 1972; Kerr, 2016) where the biocontrol agent itself came from a diseased plant...
January 4, 2017: Molecular Plant-microbe Interactions: MPMI
Zhongqin Zhang, Chika Tateda, Shang-Chuan Jiang, Jay Shrestha, Joanna Jelenska, Dequantarius J Speed, Jean Greenberg
In plants, cell surface pattern recognition receptors (PRRs) provide a first line of defense against pathogens. Although each PRR recognizes a specific ligand, they share common signaling outputs such as callose and other cell wall-based defenses. Several PRRs are also important for callose induction in response to the defense signal salicylic acid (SA). The extent to which common components are needed for PRR signaling outputs is not known. The gain-of-function Arabidopsis mutant of ACCELERATED CELL DEATH6 (ACD6) acd6-1 shows constitutive callose production that partially depends on PRRs...
January 4, 2017: Molecular Plant-microbe Interactions: MPMI
Jan Schmid, Robert Day, Ningxin Zhang, Pierre-Yves Dupont, Murray P Cox, Christopher Lewis Schardl, Niki Minards, Mauro Truglio, Neil Moore, Daniel R Harris, Yanfei Zhou
Increased resilience of pasture grasses mediated by fungal Epichloë endophytes is crucial to pastoral industries. The underlying mechanisms are only partially understood and likely involve very different activities of the endophyte in different plant tissues and responses of the plant to these. We analyzed the transcriptomes of Epichloë festucae and its host Lolium perenne in host tissues of different function and developmental stages. The endophyte contributed approximately 10x more to the transcriptomes than to the biomass of infected tissues...
December 27, 2016: Molecular Plant-microbe Interactions: MPMI
Flor E Acevedo, Michelle Peiffer, Ching-Wen Tan, Bruce A Stanley, Anne Stanley, Jie Wang, Asher G Jones, Kelli Hoover, Cristina Rosa, Dawn S Luthe, Gary Felton
Mechanical damage caused by insect feeding along with components present in their saliva and oral secretions are known to induce JA-mediated defense responses in plants. This study investigated the effects of bacteria from oral secretions of the fall armyworm (FAW), Spodoptera frugiperda, on herbivore induced defenses in tomato and maize plants. Using culture-dependent methods, we identified seven different bacterial isolates, belonging to the family Enterobacteriacea, from the oral secretions of field-collected caterpillars...
December 27, 2016: Molecular Plant-microbe Interactions: MPMI
Eloy Caballo-Ponce, Pieter van Dillewijn, Regina-Michaela Wittich, Cayo Ramos
Bacteria from the Pseudomonas syringae complex belonging to phylogroups 1 (PG1) and 3 (PG3) isolated from woody hosts share a genomic region herein referred to as WHOP (from woody host and Pseudomonas), which is absent in strains infecting herbaceous organs. In this work, we show that this region is also encoded in P. syringae pv. actinidifoliorum (PG1) and six additional members of PG3: Pseudomonas savastanoi pv. retacarpa, three P. syringae pathovars, Pseudomonas meliae and Pseudomonas amygdali. Partial conservation of the WHOP occurs in only a few PG2 strains...
December 27, 2016: Molecular Plant-microbe Interactions: MPMI
Murli Manohar, Hyong Woo Choi, Patricia M Manosalva, Caroline Austin, Joseph Peters, Daniel Klessig
To elucidate the mechanism(s) through which MORC proteins impact immunity, epigenetic gene silencing, and DNA modifications, the enzymatic activities of plant MORCs were characterized. Previously, we showed that plant MORC1s have ATPase and DNA endonuclease activities. Here we demonstrate that plant MORCs have topoisomerase type II (topo II)-like activities, as they i) covalently bind DNA, ii) exhibit DNA-stimulated ATPase activity, iii) relax/nick supercoiled DNA, iv) catenate DNA, and v) decatenante kinetoplast DNA...
December 19, 2016: Molecular Plant-microbe Interactions: MPMI
(no author information available yet)
No abstract text is available yet for this article.
January 2017: Molecular Plant-microbe Interactions: MPMI
Yucheng Zhang, Rosemary Loria
The main pathogenicity factor of Streptomyces species associated with the potato common scab disease is a nitrated diketopiperazine called thaxtomin A (ThxA). In Streptomyces scabiei (syn. S. scabies), which is thought to be the most ancient pathogenic Streptomyces species, the ThxA biosynthetic cluster is located within a mobile genomic island called the toxicogenic region (TR). Three attachment (att) sites further separate TR into two subregions (TR1 and TR2). TR1 contains the ThxA biosynthetic cluster and is conserved among several pathogenic Streptomyces species...
January 2017: Molecular Plant-microbe Interactions: MPMI
Teresa Cordero, Lidia Cerdán, Alberto Carbonell, Konstantina Katsarou, Kriton Kalantidis, José-Antonio Daròs
Zucchini yellow mosaic virus (ZYMV) induces serious diseases in cucurbits. To create a tool to screen for resistance genes, we cloned a wild ZYMV isolate and inserted the visual marker Rosea1 to obtain recombinant clone ZYMV-Ros1. While in some plant-virus combinations Rosea1 induces accumulation of anthocyanins in infected tissues, ZYMV-Ros1 infection of cucurbits did not lead to detectable anthocyanin accumulation. However, the recombinant virus did induce dark red pigmentation in infected tissues of the model plant Nicotiana benthamiana...
January 2017: Molecular Plant-microbe Interactions: MPMI
Ying Li, He Shen, Qian Zhou, Kun Qian, Theo van der Lee, Sanwen Huang
The oomycete Phytophthora infestans was the causal agent of the Irish Great Famine and is a recurring threat to global food security. The pathogen can reproduce both sexually and asexually, with high potential to adapt to various environments and great risk to break disease resistance genes in potato. As are other oomycetes, P. infestans is regarded to be diploid during the vegetative phase of its life cycle, although some studies reported trisomy and polyploidy. Using microsatellite fingerprinting, genome-wide assessment of single nucleotide polymorphisms, nuclear DNA quantification, and microscopic counting of chromosome numbers, we assessed the ploidy level of a comprehensive selection of isolates...
January 2017: Molecular Plant-microbe Interactions: MPMI
Yunpeng Liu, Lin Chen, Gengwei Wu, Haichao Feng, Guishan Zhang, Qirong Shen, Ruifu Zhang
Colonization of plant growth-promoting rhizobacteria (PGPR) is critical for exerting their beneficial effects on the plant. Root exudation is a major factor influencing the colonization of both PGPR and soil-borne pathogens within the root system. However, the tripartite interaction of PGPR, plant roots, and soil-borne pathogens is poorly understood. We screened root exudates for signals that mediate tripartite interactions in the rhizosphere. In a split-root system, we found that root colonization of PGPR strain Bacillus amyloliquefaciens SQR9 on cucumber root was significantly enhanced by preinoculation with SQR9 or the soil-borne pathogen Fusarium oxysporum f...
January 2017: Molecular Plant-microbe Interactions: MPMI
Hidekazu Iwakawa, Benjamin C Carter, Brett C Bishop, Joe Ogas, Stanton B Gelvin
Agrobacterium-mediated transformation is a core technology for basic plant science and agricultural biotechnology. Improving transformation frequency is a major goal for plant transgenesis. We previously showed that T-DNA insertions in some histone genes decreased transformation susceptibility, whereas overexpression of several Arabidopsis H2A and H4 isoforms increased transformation. Overexpression of several histone H2B and H3 isoforms had little effect on transformation frequency. However, overexpression of histone H3-11 (HTR11) enhanced transformation...
January 2017: Molecular Plant-microbe Interactions: MPMI
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