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Ascochyta lentis isolate:Al4

ABSTRACT: Ascochyta lentis isolate:Al4 Genome sequencing and assembly

PROVIDER: PRJNA510691 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	SRR8369310.fastq.gz	Fastqsanger.gz
	SRR8369310_1.fastq.gz	Fastqsanger.gz
	SRR8369310_2.fastq.gz	Fastqsanger.gz
	SRR8363792_subreads.fastq.gz	Fastqsanger.gz

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Reference genome assembly for Australian Ascochyta lentis isolate Al4.

Project description:Ascochyta lentis causes ascochyta blight in lentil (Lens culinaris Medik.) and yield loss can be as high as 50%. With careful agronomic management practices, fungicide use, and advances in breeding resistant lentil varieties, disease severity and impact to farmers have been largely controlled. However, evidence from major lentil producing countries, Canada and Australia, suggests that A. lentis isolates can change their virulence profile and level of aggressiveness over time and under different selection pressures. In this paper, we describe the first genome assembly for A. lentis for the Australian isolate Al4, through the integration of data from Illumina and PacBio SMRT sequencing. The Al4 reference genome assembly is almost 42 Mb in size and encodes 11,638 predicted genes. The Al4 genome comprises 21 full-length and gapless chromosomal contigs and two partial chromosome contigs each with one telomere. We predicted 31 secondary metabolite clusters, and 38 putative protein effectors, many of which were classified as having an unknown function. Comparison of A. lentis genome features with the recently published reference assembly for closely related A. rabiei show that genome synteny between these species is highly conserved. However, there are several translocations and inversions of genome sequence. The location of secondary metabolite clusters near transposable element and repeat-rich genomic regions was common for A. lentis as has been reported for other fungal plant pathogens.

| S-EPMC8022934 | biostudies-literature

Transcriptional profiling of Ascochyta blight resistance in Lentil

Project description:Using a cDNA microarray themed on Ascochyta-Pulse interaction resistance response was studied in two lentil varieties, specifically in response to A. lentis inoculation in a highly resistant (ILL7537) and highly susceptible (ILL6002) lentil variety. The experiments were conducted in reference design, where samples from mock-inoculated controls acted as references against post-inoculation samples and the plants were grown using a uniform and standardized experimental system that minimized environmental effects. Robust and high quality data was obtained through the use of three biological replicates (including a dye-swap), the inclusion of negative controls, and stringent selection criteria for differentially expressed genes including a fold change cutoff determined by self-self hybridizations, Students t-test and FDR (Fasle Discovary Rate) multiple testing correction (P<0.05). Microarray observations were validated by quantitative real time RT-PCR using the RNA from one of the bioassay used in the original microarray experiment. Ninety genes were differentially expressed in ILL7537 and 95 genes were differentially expressed in ILL6002. The expression profiles of the two varieties showed substantial difference in type and time of genes that were expressed in response to A. lentis. The resistant variety showed early up-regulation of PR proteins and other defence related genes. The susceptible genotype showed mainly down-regulation of defence related genes. The microarray experiment, the first in lentil, conducted with a small number of genes themed on Asochyta and Pulse interactions was able to identify different components of the defence mechanism by comparing the transcriptional profiles of the susceptible and resistant genotypes. This study will thus form the basis of future experiments to elaborate and corroborate the genomics of lentils defence to A. lentis. Keywords: time course, disease state analysis

2008-05-08 | GSE11374 | GEO

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