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Transcriptome of the conifer Pinus cembra based on Swiss individuals

ABSTRACT: Transcriptome of the conifer Pinus cembra (Swiss stone pine) based on Swiss individuals

PROVIDER: PRJEB29997 | ENA |

REPOSITORIES: ENA

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Dataset's files

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			Action	DRS
	ERR2936770_1.fastq.gz	Fastqsanger.gz
	ERR2936770_2.fastq.gz	Fastqsanger.gz
	ERR2936771_1.fastq.gz	Fastqsanger.gz
	ERR2936771_2.fastq.gz	Fastqsanger.gz
	ERR2936762_1.fastq.gz	Fastqsanger.gz

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Transcriptome profiling of Pinus radiata branches reveals new insights into compression wood formation in response to gravity stress

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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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Transcriptome profiling of Pinus radiata branches reveals new insights into compression wood formation in response to gravity stress

Project description:Compression (CW) and opposite wood (OW) are formed in the uniderside and upperside of conifer branches respectively in response to gravity stress. We investigated genes differentially transcribed between the underside and upside of radiate pine branches using cDNA microarrays with a view to plant gravitropism. Six trees with well-developed branches were selected from a radiata pine commercial plantation (aged 13 years) located at Bondo, NSW, Australia (35Âº 16' 44.04 S, 148Âº 26' 54.66 E). The largest branch from each tree was further selected for sampling, including three branches sampled in April 2007 (autumn in Bondo) and three sampled in October 2007 (spring). Bark was removed from the base part (about 10 cm in length) of each branch. Developing xylem tissues were scraped from the exposed upperside and underside surface respectively with a sharp chisel. Samples were immediately placed into 50 ml BD FalconTM tubes filled with liquid nitrogen. Gene expression in the underside and upperside of branches was compared using radiata pine cDNA microarrays.

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Project description:The response mechanisms, recognition and specificity of conifer trees during interaction with pathogenic, saprotrophic or symbiotic ectomycorrhizal fungus were investigated. The roots of Pinus sylvestris were challenged for five days with either Heterobasidion annosum (a pathogenic root rot fungus which attacks Norway spruce, Scots pine and broad leaf trees); Laccaria bicolor (an obligate ectomycorrhizal symbiont); or Trichoderma aureoviride (an obligate saprotroph). The gene expression data from cDNA micro-arrays consisting of 2176 Pinus taeda genes were analysed using 2-interconnected mixed linear model statistical approach. The result of the pairwise comparisons of the different treatments against un-inoculated control led to identification of genes specifically differentially expressed in the pathogenic, saprotrophic and symbiotic interactions. The results were compared with similar data obtained for two other interaction stages: 1 and 15 days post inoculation. The result of this comprehensive expression profiling will hopefully shed more light on the mechanistic basis for recognition and response of conifer trees to pathogenic and non-pathogenic fungi. Keywords: stress response

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