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Discerning role of a functional arsenic resistance cassette in evolution and adaptation of a rice pathogen

ABSTRACT: Discerning role of a functional arsenic resistance cassette in evolution and adaptation of a rice pathogen

PROVIDER: PRJNA686070 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR13267621_1.fastq.gz	Fastqsanger.gz
	SRR13267621_2.fastq.gz	Fastqsanger.gz
	SRR13267622_1.fastq.gz	Fastqsanger.gz
	SRR13267622_2.fastq.gz	Fastqsanger.gz
	SRR13267623_1.fastq.gz	Fastqsanger.gz

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Discerning role of a functional arsenic resistance cassette in evolution and adaptation of a rice pathogen

Project description:Arsenic (As) is highly toxic element to all forms of life and is a major environmental contaminant. Understanding acquisition, detoxification, and adaptation mechanisms in bacteria that are associated with host in arsenic-rich conditions can provide novel insights into dynamics of host-microbe-microenvironment interactions. In the present study, we have investigated an arsenic resistance mechanism acquired during the evolution of a particular lineage in the population of Xanthomonas oryzae pv. oryzae (Xoo), which is a serious plant pathogen infecting rice. Our study revealed the horizontal acquisition of a novel chromosomal 12kb ars cassette in Xoo IXO1088 that confers high resistance to arsenate/arsenite. The ars cassette comprises several genes that constitute an operon induced in the presence of arsenate/arsenite. This cassette has spread in lineage with highly virulent strains owing to a particular lineage’s evolutionary success. Further, we performed the transcriptomic analysis of Xoo strain IXO1088 under arsenate/arsenite exposure using RNA sequencing. The transcriptomic analysis revealed that arsenic detoxification and efflux, oxidative stress response, iron acquisition/storage, and damage repair are the main cellular responses to arsenic exposure. The study provides useful insights into the acquisition, detoxification, and adaptation mechanisms among Xoo populations to adapt under arsenic-rich environmental conditions.

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Project description:RNA from stem containing first node and internodes during dough stage was considered for the above purpose. Satabdi, (popularly known as Minikit) most popular cultivar of West Bengal and Palman, another high yielding variety were considered for microarray analysis for comparison to each other. Two rice genotypes were grown in identical conditions (same field with contaminated ground water) to obtain the most meaningful conclusion. Dough stage was considered as variation in arsenic accumulation among the genotypes starts during dough stage to maturity. Plant tissues were collected from stem for transcriptomic analysis as expression profiling of such tissue in response to arsenic would be most useful as arsenic transport/loading in grain was assumed to be controlled by arsenic translocation behavior at inter vascular level or from xylem to phloem. Satabdi accumulates more than twice of arsenic in brown rice (0.346 mg/kg) than that of Palman (0.156 mg/kg) whereas accumulation in straw (2.07 mg/kg) was approximately less than half of the Palman (4.491 mg/kg)

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