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https://www.readbyqxmd.com/read/27936244/gene-expression-and-silencing-studies-in-phytophthora-infestans-reveal-infection-specific-nutrient-transporters-and-a-role-for-the-nitrate-reductase-pathway-in-plant-pathogenesis
#1
Melania Abrahamian, Audrey M V Ah-Fong, Carol Davis, Kalina Andreeva, Howard S Judelson
To help learn how phytopathogens feed from their hosts, genes for nutrient transporters from the hemibiotrophic potato and tomato pest Phytophthora infestans were annotated. This identified 453 genes from 19 families. Comparisons with a necrotrophic oomycete, Pythium ultimum, and a hemibiotrophic fungus, Magnaporthe oryzae, revealed diversity in the size of some families although a similar fraction of genes encoded transporters. RNA-seq of infected potato tubers, tomato leaves, and several artificial media revealed that 56 and 207 transporters from P...
December 9, 2016: PLoS Pathogens
https://www.readbyqxmd.com/read/27936079/high-temperature-induced-defects-in-tomato-solanum-lycopersicum-anther-and-pollen-development-are-associated-with-reduced-expression-of-b-class-floral-patterning-genes
#2
Florian Müller, Jiemeng Xu, Lieke Kristensen, Mieke Wolters-Arts, Peter F M de Groot, Stuart Y Jansma, Celestina Mariani, Sunghun Park, Ivo Rieu
Sexual reproduction is a critical process in the life-cycle of plants and very sensitive to environmental perturbations. To better understand the effect of high temperature on plant reproduction, we cultivated tomato (Solanum lycopersicum) plants in continuous mild heat. Under this condition we observed a simultaneous reduction in pollen viability and appearance of anthers with pistil-like structures, while in a more thermotolerant genotype, both traits were improved. Ectopic expression of two pistil-specific genes, TRANSMITTING TISSUE SPECIFIC and TOMATO AGAMOUS LIKE11, in the anthers confirmed that the anthers had gained partial pistil identity...
2016: PloS One
https://www.readbyqxmd.com/read/27934291/antiprotozoal-effects-of-the-tomato-tetrasaccharide-glycoalkaloid-tomatine-and-the-aglycone-tomatidine-on-mucosal-trichomonads
#3
Jenny Liu, Sierra Kanetake, Yun-Hsuan Wu, Christina Tam, Luisa W Cheng, Kirkwood M Land, Mendel Friedman
The present study investigated the inhibitory effects of the commercial tetrasaccharide tomato glycoalkaloid tomatine and the aglycone tomatidine on three mucosal pathogenic protozoa that are reported to infect humans, cattle, and cats, respectively: Trichomonas vaginalis strain G3, Tritrichomonas foetus strain D1, and Tritrichomonas foetus strain C1. A preliminary screen showed that tomatine at 100 μM concentration completely inhibited the growth of all three trichomonads. In contrast, the inhibition of all three pathogens by tomatidine was much lower, suggesting the involvement of the lycotetraose carbohydrate side chain in the mechanism of inhibition...
November 23, 2016: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/27933363/spatially-resolved-metabolic-distribution-for-unraveling-the-physiological-change-and-responses-in-tomato-fruit-using-matrix-assisted-laser-desorption-ionization-mass-spectrometry-imaging-maldi-msi
#4
Junya Nakamura, Tomomi Morikawa-Ichinose, Yoshinori Fujimura, Eisuke Hayakawa, Katsutoshi Takahashi, Takanori Ishii, Daisuke Miura, Hiroyuki Wariishi
Information on spatiotemporal metabolic behavior is indispensable for a precise understanding of physiological changes and responses, including those of ripening processes and wounding stress, in fruit, but such information is still limited. Here, we visualized the spatial distribution of metabolites within tissue sections of tomato (Solanum lycopersicum L.) fruit using a matrix-assisted laser desorption/ionization-mass spectrometry imaging (MALDI-MSI) technique combined with a matrix sublimation/recrystallization method...
December 8, 2016: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/27933087/revisiting-vitis-vinifera-subtilase-gene-family-a-possible-role-in-grapevine-resistance-against-plasmopara-viticola
#5
Joana Figueiredo, Gonçalo J Costa, Marisa Maia, Octávio S Paulo, Rui Malhó, Marta Sousa Silva, Andreia Figueiredo
Subtilisin-like proteases, also known as subtilases, are a very diverse family of serine peptidases present in many organisms. In grapevine, there are hints of the involvement of subtilases in defense mechanisms, but their role is not yet understood. The first characterization of the subtilase gene family was performed in 2014. However, simultaneously, the grapevine genome was re-annotated and several sequences were re-annotated or retrieved. We have performed a re-characterization of this family in grapevine and identified 82 genes coding for 97 putative proteins, as result of alternative splicing...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27933079/small-rnas-from-bemisia-tabaci-are-transferred-to-solanum-lycopersicum-phloem-during-feeding
#6
Paula J M van Kleeff, Marc Galland, Robert C Schuurink, Petra M Bleeker
The phloem-feeding whitefly Bemisia tabaci is a serious pest to a broad range of host plants, including many economically important crops such as tomato. These insects serve as a vector for various devastating plant viruses. It is known that whiteflies are capable of manipulating host-defense responses, potentially mediated by effector molecules in the whitefly saliva. We hypothesized that, beside putative effector proteins, small RNAs (sRNA) are delivered by B. tabaci into the phloem, where they may play a role in manipulating host plant defenses...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27933077/ethylene-is-not-responsible-for-phytochrome-mediated-apical-hook-exaggeration-in-tomato
#7
Miki Takahashi-Asami, Chizuko Shichijo, Seiji Tsurumi, Tohru Hashimoto
The apical hook of tomato seedlings is exaggerated by phytochrome actions, while in other species such as bean, pea and Arabidopsis, the hook is exaggerated by ethylene and opens by phytochrome actions. The present study was aimed to clarify mainly whether ethylene is responsible for the phytochrome-mediated hook exaggeration of tomato seedlings. Dark-grown 5-day-old seedlings were subjected to various ways of ethylene application in the dark as well as under the actions of red (R) or far-red light (FR). The ethylene emitted by seedlings was also quantified relative to hook exaggeration...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27929131/silencing-of-the-slnap7-gene-influences-plastid-development-and-lycopene-accumulation-in-tomato
#8
Da-Qi Fu, Lan-Huan Meng, Ben-Zhong Zhu, Hong-Liang Zhu, Hua-Xue Yan, Yun-Bo Luo
Ripening is an important stage of fruit development. To screen the genes associated with pigment formation in tomato fruit, a suppression subtractive hybridization (SSH) cDNA library was constructed by using tomato fruit in the green ripe and break ripe stages, and 129 differential genes were obtained. Using redness as a screening marker, virus-induced gene silencing (VIGS) of the differential genes was performed with a sprout vacuum-infiltration system (SVI). The results showed that silencing the SlNAP7 gene affected the chloroplast development of tomato leaves, manifesting as a photo-bleaching phenotype, and silenced fruit significantly affected the accumulation of lycopene, manifested as a yellow phenotype...
December 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27929095/the-sphingolipid-biosynthetic-enzyme-sphingolipid-delta8-desaturase-is-important-for-chilling-resistance-of-tomato
#9
Ying Zhou, Lanting Zeng, Xiumin Fu, Xin Mei, Sihua Cheng, Yinyin Liao, Rufang Deng, Xinlan Xu, Yueming Jiang, Xuewu Duan, Susanne Baldermann, Ziyin Yang
The physiological functions of sphingolipids in animals have been intensively studied, while less attention has been paid to their roles in plants. Here, we reveal the involvement of sphingolipid delta8 desaturase (SlSLD) in the chilling resistance of tomato (Solanum lycopersicum cv. Micro-Tom). We used the virus-induced gene silencing (VIGS) approach to knock-down SlSLD expression in tomato leaves, and then evaluated chilling resistance. Changes in leaf cell structure under a chilling treatment were observed by transmission electron microscopy...
December 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27929054/in-silico-identification-of-snp-diversity-in-cultivated-and-wild-tomato-species-insight-from-molecular-simulations
#10
Archana Bhardwaj, Yogeshwar Vikram Dhar, Mehar Hasan Asif, Sumit K Bag
Single Nucleotide Polymorphisms (SNPs), an important source of genetic variations, are often used in crop improvement programme. The present study represented comprehensive In silico analysis of nucleotide polymorphisms in wild (Solanum habrochaites) and cultivated (Solanum lycopersicum) species of tomato to explore the consequence of substitutions both at sequence and structure level. A total of 8978 SNPs having Ts/Tv (Transition/Transversion) ratio 1.75 were identified from the Expressed Sequence Tag (EST) and Next Generation Sequence (NGS) data of both the species available in public databases...
December 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27928924/p22-of-tomato-chlorosis-virus-an-rna-silencing-suppressor-is-naturally-expressed-in-the-infected-plant
#11
R Zhao, N Wang, S Liu, K Ling, Z Fan, T Zhou
No abstract text is available yet for this article.
2016: Acta Virologica
https://www.readbyqxmd.com/read/27928913/detection-and-molecular-characterization-of-slovak-tomato-isolates-belonging-to-two-recombinant-strains-of-potato-virus-y
#12
N Sihelská, L Predajňa, A Nagyová, K Šoltys, J Budiš, J Gubiš, M Mrkvová, J Kraic, D Mihálik, M Glasa
Total RNAs from a symptomless tomato plant were subjected to next-generation sequencing (NGS) analysis, revealing the presence of a single viral agent - potato virus Y (PVY). The analysis of determined full-length genome sequence assigned the PVY SL16 isolate to the recombinant PVY-N-Wi strain group. A series of primers targeting the four main recombinant junction (RJ) sites were used for characterization of additional 5 tomato PVY isolates recovered in Western Slovakia. Based on the partial sequences, the isolates could be classified as belonging to PVY-N-Wi and PVY-NTNa strain groups...
2016: Acta Virologica
https://www.readbyqxmd.com/read/27926824/identification-and-characterization-of-chemosensors-for-d-malate-unnatural-enantiomer-of-malate-in-ralstonia-pseudosolanacearum
#13
Mattana Tunchai, Akiko Hida, Shota Oku, Yutaka Nakashimada, Takahisa Tajima, Junichi Kato
Ralstonia pseudosolanacearum Ps29 is attracted by nonmetabolizable D-malate, an unnatural enantiomer. Screening of a complete collection of single-mcp-gene deletion mutants of Ps29 revealed that the RSc1156 homolog is a chemosensor for D-malate. An RSc1156 homolog deletion mutant of Ps29 showed decreased but significant responses to D-malate, suggesting the existence of another D-malate chemosensor. McpM previously had been identified as a chemosensor for L-malate. We constructed an RSc1156 homolog mcpM double deletion mutant and noted that this mutant failed to respond to D-malate; thus, the RSc1156 homolog and McpM are the major chemosensors for D-malate in this organism...
December 2, 2016: Microbiology
https://www.readbyqxmd.com/read/27925705/occurrence-of-pesticide-residues-in-fruiting-vegetables-from-production-farms-in-south-eastern-region-of-poland
#14
Magdalena Słowik-Borowiec, Ewa Szpyrka, Julian Rupar, Magdalena Podbielska, Aneta Matyaszek
Background: Considering the fact that pesticides are commonly used in agriculture, continuous monitoring of these substances in food products is of great significance. Residues of these substances can be present in crops after harvest. Objective: The aim of this study was to evaluate presence of pesticide residues in fruiting vegetables from production farms in south-eastern region of Poland in 2012–2015. Material and methods: 138 samples were tested using accredited test methods...
2016: Roczniki Państwowego Zakładu Higieny
https://www.readbyqxmd.com/read/27925169/parasites-and-competitors-suppress-bacterial-pathogen-synergistically-due-to-evolutionary-trade-offs
#15
Xiaofang Wang, Zhong Wei, Mei Li, Xueqi Wang, Anqi Shan, Xinlan Mei, Alexandre Jousset, Qirong Shen, Yangchun Xu, Ville-Petri Friman
Parasites and competitors are important for regulating pathogen densities and subsequent disease dynamics. It is, however, unclear to what extent this is driven by ecological and evolutionary processes. Here we used experimental evolution to study the eco-evolutionary feedbacks between Ralstonia solanacearum bacterial pathogen, Ralstonia-specific phage parasite and Bacillus amyloliquefaciens competitor bacterium in the laboratory and plant rhizosphere. We found that while the phage had a small effect on pathogen densities on its own, it considerably increased the R...
December 7, 2016: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/27925020/susceptibility-of-phytomonas-serpens-to-calpain-inhibitors-in-vitro-interference-on-the-proliferation-ultrastructure-cysteine-peptidase-expression-and-interaction-with-the-invertebrate-host
#16
Simone Santiago Carvalho de Oliveira, Diego de Souza Gonçalves, Aline Dos Santos Garcia-Gomes, Inês Correa Gonçalves, Sergio Henrique Seabra, Rubem Figueiredo Menna-Barreto, Angela Hampshire de Carvalho Santos Lopes, Claudia Masini D'Avila-Levy, André Luis Souza Dos Santos, Marta Helena Branquinha
A pleiotropic response to the calpain inhibitor MDL28170 was detected in the tomato parasite Phytomonas serpens. Ultrastructural studies revealed that MDL28170 caused mitochondrial swelling, shortening of flagellum and disruption of trans Golgi network. This effect was correlated to the inhibition in processing of cruzipain-like molecules, which presented an increase in expression paralleled by decreased proteolytic activity. Concomitantly, a calcium-dependent cysteine peptidase was detected in the parasite extract, the activity of which was repressed by pre-incubation of parasites with MDL28170...
December 1, 2016: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/27924122/a-tomato-plastidic-atp-adp-transporter-gene-slaatp-increases-starch-content-in-transgenic-arabidopsis
#17
Feibing Wang, Yuxiu Ye, Yuan Niu, Faxiang Wan, Bo Qi, Xinhong Chen, Qing Zhou, Boqing Chen
A plastidic ATP/ADP transporter (AATP) is responsible for importing ATP from the cytosol into plastids. Increasing the ATP supply is a potential way to facilitate anabolic synthesis in heterotrophic plastids of plants. In this work, a gene encoding the AATP protein, named SlAATP, was successfully isolated from tomato. Expression of SlAATP was induced by exogenous sucrose treatment in tomato. The coding region of SlAATP was cloned into a binary vector under the control of 35S promoter and then transformed into Arabidopsis to obtain transgenic plants...
October 2016: Physiology and Molecular Biology of Plants: An International Journal of Functional Plant Biology
https://www.readbyqxmd.com/read/27924121/overexpression-of-panax-ginseng-sesquiterpene-synthase-gene-confers-tolerance-against-pseudomonas-syringae-pv-tomato-in-arabidopsis-thaliana
#18
Sung-Joo Yoon, Johan Sukweenadhi, Altanzul Khorolragchaa, Ramya Mathiyalagan, Sathiyamoorthy Subramaniyam, Yeon-Ju Kim, Ho-Bin Kim, Mi-Jung Kim, Yu-Jin Kim, Deok-Chun Yang
Sesquiterpenes are an abundant group belonging to the terpenoid family, with a C15 structure comprise of three isoprene units. Many sesquiterpenes are volatile compounds and it act as chemical messenger in plant signalling, particularly in the defense mechanism against biotic and abiotic stresses. Panax ginseng Meyer is important medicinal herbs with various reported pharmacological efficacies in which its triterpenoid saponins, called ginsenosides, were mostly studied. However, there have been few studies on volatile sesquiterpenes compounds regulation on P...
October 2016: Physiology and Molecular Biology of Plants: An International Journal of Functional Plant Biology
https://www.readbyqxmd.com/read/27921397/nitric-oxide-induced-by-polyamines-involves-antioxidant-systems-against-chilling-stress-in-tomato-lycopersicon-esculentum-mill-seedling
#19
Qian-Nan Diao, Yong-Jun Song, Dong-Mei Shi, Hong-Yan Qi
Polyamines (PAs) and nitric oxide (NO) are vital signals in modulating plant response to abiotic stress. However, to our knowledge, studies on the relationship between NO and PAs in response to cold stress in tomato are limited. Accordingly, in this study, we investigated the effects of putrescine (Put) and spermidine (Spd) on NO generation and the function of Spd-induced NO in the tolerance of tomato seedling under chilling stress. Spd increased NO release via the nitric oxide synthase (NOS)-like and nitrate reductase (NR) enzymatic pathways in the seedlings, whereas Put had no such effect...
2016: Journal of Zhejiang University. Science. B
https://www.readbyqxmd.com/read/27920785/a-jasmonate-inducible-defense-trait-transferred-from-wild-into-cultivated-tomato-establishes-increased-whitefly-resistance-and-reduced-viral-disease-incidence
#20
Rocío Escobar-Bravo, Juan M Alba, Clara Pons, Antonio Granell, Merijn R Kant, Enrique Moriones, Rafael Fernández-Muñoz
Whiteflies damage tomatoes mostly via the viruses they transmit. Cultivated tomatoes lack many of the resistances of their wild relatives. In order to increase protection to its major pest, the whitefly Bemisia tabaci and its transmitted Tomato Yellow Leaf Curl Virus (TYLCV), we introgressed a trichome-based resistance trait from the wild tomato Solanum pimpinellifolium into cultivated tomato, Solanum lycopersicum. The tomato backcross line BC5S2 contains acylsucrose-producing type-IV trichomes, unlike cultivated tomatoes, and exhibits increased, yet limited protection to whiteflies at early development stages...
2016: Frontiers in Plant Science
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