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ABSTRACT: Karst Rice Soil

PROVIDER: PRJNA814987 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR18299847_1.fastq.gz	Fastqsanger.gz
	SRR18299847_2.fastq.gz	Fastqsanger.gz
	SRR18299848_1.fastq.gz	Fastqsanger.gz
	SRR18299848_2.fastq.gz	Fastqsanger.gz
	SRR18299849_1.fastq.gz	Fastqsanger.gz

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Project description:Karst Rice Soil Under Green Fertilizer Measures

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Project description:Arsenic (As) bioavailability in the rice rhizosphere is influenced by many microbial interactions, particularly by metal-transforming functional groups at the root-soil interface. This study was conducted to examine As-transforming microbes and As-speciation in the rice rhizosphere compartments, in response to two different water management practices (continuous and intermittently flooded), established on fields with high to low soil-As concentration. Microbial functional gene composition in the rhizosphere and root-plaque compartments were characterized using the GeoChip 4.0 microarray. Arsenic speciation and concentrations were analyzed in the rhizosphere soil, root-plaque, porewater and grain samples. Results indicated that intermittent flooding significantly altered As-speciation in the rhizosphere, and reduced methyl-As and AsIII concentrations in the pore water, root-plaque and rice grain. Ordination and taxonomic analysis of detected gene-probes indicated that root-plaque and rhizosphere assembled significantly different metal-transforming functional groups. Taxonomic non-redundancy was evident, suggesting that As-reduction, -oxidation and -methylation processes were performed by different microbial groups. As-transformation was coupled to different biogeochemical cycling processes establishing functional non-redundancy of rice-rhizosphere microbiome in response to both rhizosphere compartmentalization and experimental treatments. This study confirmed diverse As-biotransformation at root-soil interface and provided novel insights on their responses to water management, which can be applied for mitigating As-bioavailability and accumulation in rice grains.

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Phosphate excess increases susceptibility to pathogen infection in rice

Project description:Phosphorus (P) is an essential nutrient for plant growth and productivity. Due to soil fixation, however, phosphorus availability in soil is rarely sufficient to sustain high crop yields. Fertilizers are widely used to circumvent the limited bioavailability of phosphate (Pi) which led to a scenario of excessive soil P in agricultural soils. Whereas adaptive responses to Pi deficiency have been deeply studied, less is known about how plants adapt to Pi excess and how Pi excess might affect disease resistance. Here, we show that high Pi fertilization in rice plants, and subsequent Pi accumulation in leaves, enhances susceptibility to infection by Magnaporthe oryzae, the causal agent of the rice blast disease. Equally, MIR399f overexpression causes an increase in Pi content in rice leaves which results in enhanced susceptibility to M. oryzae. During pathogen infection, a weaker activation of defense-related genes occurs in rice plants accumulating Pi in leaves, a response that is in agreement with the phenotype of blast susceptibility observed in these plants. These data support that Pi, when in excess, compromises defense mechanisms in rice while demonstrating that miR399 functions as a negative regulator of rice immunity. The two signaling pathways, Pi signaling and defense signaling, must operate in a coordinated manner in controlling disease resistance. This information provides a basis to understand the molecular mechanisms involved in immunity in rice plants grown under a high Pi fertilization regime, an aspect that should be considered in management of the rice blast disease

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Small RNA analysis of ASR5 knockdown rice plants (ssp. Japonica cv. Nipponbare) under Al stress conditions

Project description:Aluminum (Al) toxicity in plants is one of the primary constraints in crop production. Al³⁺, the most toxic form of Al, is released into soil under acidic conditions and causes extensive damage to plants, especially in the roots. In rice, Al tolerance requires the ASR5 gene, but the molecular function of ASR5 has remained unknown. This data establish a comparative study of miRNAome profiles in ASR5 knockdown rice plants (ssp. Japonica cv. Nipponbare) under Al stress conditions.

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