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Heterobasidion annosum gene expression during saprotrophic growth on topsoil (organic layer) from mineral soil, drained and undrained peatland forests.

ABSTRACT: Transcript profiles of H. annosum from different tissues and mycelium grown on different substrates and under different stresses were analyzed. The array probes were designed from gene models taken from the Joint Genome Institute (JGI, department of energy) H. irregulare genome sequence version 1. One aim of this study was to compare gene expression profiles of H. annosum during saprotrophic growth on topsoil from mineral soil, drained and undrained peatland.

ORGANISM(S): Heterobasidion annosum

PROVIDER: GSE55290 | GEO | 2015/10/01

SECONDARY ACCESSION(S): PRJNA239318

REPOSITORIES: GEO

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Heterobasidion annosum

Project description:Heterobasidion annosum gene expression during saprotrophic growth on topsoil (organic layer) from mineral soil, drained and undrained peatland forests.

| PRJNA239318 | ENA

Heterobasidion annosum gene expression from mycelium grown on different substrates

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Heterobasidion annosum gene expression from different tissues and mycelium grown on different substrates and under different biotic and abiotic stresses

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Heterobasidion annosum gene expression from mycelium grown on different substrates

Project description:Transcript profiles of H. annosum from mycelium grown on different substrates and under different stresses were analyzed. The array probes were designed from gene models taken from the Joint Genome Institute (JGI, department of energy) H. irregulare genome sequence version 1. One aim of this study was to compare gene expression profiles of H. annosum pre-grown on secondary metabolites from the biocontrol agent Phlebiopsis gigantea. We performed six hybridizations with samples derived from H. annosum grown in either liquid Malt Extract Medium (three biological replicates) or on secondary metabolite from Phlebiopsis gigantea (three biological replicates). The Heterobasidion irregulare custom-exon expression array (4 x 72K) manufactured by Roche NimbleGen Systems Limited (Madison, WI) (http://www.nimblegen.com/products/exp/index.html) contained five independent, non-identical, 60-mer probes per gene model coding sequence. For 12,199 of the 12,299 annotated protein-coding gene models, probes could be designed. For 19 gene models, no probes could be generated, and 81 gene models shared all five probes with other gene models. Included in the array were 916 random 60-mer control probes and labelling controls. For 2032 randomly chosen gene models, technical duplicates were included on the array.

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Heterobasidion annosum gene expression from different tissues and mycelium grown on different substrates and under different biotic and abiotic stresses

Project description:Transcript profiles of H. annosum from different tissues and mycelium grown on different substrates and under different stresses were analyzed. The array probes were designed from gene models taken from the Joint Genome Institute (JGI, Department of Energy) H. irregulare genome sequence version 1. One aim of this study was to compare gene expression profiles of H. annosum grown on different substrates and under different biotic and abiotic stresses. We performed hybridizations (NimbleGen) with samples derived from H. annosum grown in either liquid Malt Extract Medium at 20Â°C (three biological replicates), under NaCl stress (three biological replicates), under CaCl2 stress (three biological replicates), at 8Â°C (three biological replicates), at 27Â°C (three biological replicates), saprotrophic growth on Scots pine sapwood (three biological replicates), bark (three biological replicates) or heartwood (three biological replicates). Additional hybridizations were performed with RNA from necrotrophic growth of Heterobasidion on Scots pine xylem (three biological replicates), necrotrophic growth on Scots pine phloem (three biological replicates), under nutrient starvation (three biological replicates) or under oxidative stress (three biological replicates). The Heterobasidion irregulare custom-exon expression array (4 x 72K) manufactured by Roche NimbleGen Systems Limited (Madison, WI) (http://www.nimblegen.com/products/exp/index.html) contained five independent, non-identical, 60-mer probes per gene model coding sequence. For 12,199 of the 12,299 annotated protein-coding gene models, probes could be designed. For 19 gene models, no probes could be generated, and 81 gene models shared all five probes with other gene models. Included in the array were 916 random 60-mer control probes and labelling controls. For 2032 randomly chosen gene models, technical duplicates were included on the array.

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Transcript profiling of Pinus sylvestris trees as a response to Heterobasidion annosum infection under field conditions

Project description:In conifer forests of Northern Europe, a pathogenic fungus Heterobasidion annosum attacks the roots of Scots pine and causes mortality. Trees with infection grow slower and produce less timber with reduced quality. Despite applied control methods, such as switching tree species to a non-host species, or stump treatment, root and butt rot continues to be a serious forest health problem. Disease resistance breeding is a less-applied control method which has potential to improve tree health. However, neither conifer genotypes with absolute resistance to Heterobasidion sp. nor robust selection markers for resistance breeding have been found. We studied the responses of various Scots pine genotypes to Heterobasidion annosum infection and mechanic damage in drained peatland. Stems and roots of mature naturally regenerated Scots pine trees growing in drained peatland were either artificially infected with H. annosum or wounded and inoculated with sterile inoculum. Untreated trees from the study sites served as controls. Responses of different Scots pine genotypes to pathogen infection as determined by lesion size were recorded from samples harvested four months after inoculation, and least susceptible and highly susceptible genotypes were selected from the study material. Analysis of terpenoids from both least susceptible and highly susceptible pine genotypes by gas chromatography coupled with mass spectrometry indicates that some monoterpenes and sesquiterpenes are differentially induced depending on the susceptibility level. Transcriptomic microarray analysis was therefore conducted with RNA from stems of the least susceptible and highly susceptible Scots pine genotypes. Gene expression data from cDNA microarray were analysed by comparisons between the treatments, and the genotypes with different resistance level. The aim of the study is to highlight transcripts specific to differing levels of susceptibility.

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