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Salinity induced gene expression profiling in 8 diverse rice genotypes

ABSTRACT: Whole genome transcriptional responses is profiled in the 0 & 120 mM NaCl stressed whole seedlings of four indica (Pokkali, PSBRc50, IR 58, BRRI dhan 29), two Japonica (Banikat, Nipponbare) and two wild (O. latifolia, O. Rufipogon) accessions of rice (that showed varied level of tolerance to salt stresses) to identify the salinity induced transcripts. Stress was imposed on 14 day old seedlings and total RNA from the whole seedlings was collected after 48 h of stressed period (i.e., from 16 day old seedlings). These data sets were used for two different analyses. Firstly, the gene expression responses of eight rice genotypes was interrogated by the weighted continuous morpho-physiological trait responses (on a scale of 0 to 1) using a modified version of the ‘Significance Analysis of Microarrays’ (SAM) to identify the genes whose expression changes significantly and which is relative to the changes in morpho-physiological traits over these rice genotypes. Secondly, the differentially expressed significant salinity induced genes were also identified in the tolerant and in the susceptible genotypes using Gene-spring software. The genes that enriched the important biological processes and molecular functions (as identified by Gene Ontology: Singular enrichment analysis) are discussed in a way to explain the roles of these genes in overall stress adaptation mechanism.

ORGANISM(S): Oryza sativa

PROVIDER: GSE79043 | GEO | 2016/03/10

SECONDARY ACCESSION(S): PRJNA314783

REPOSITORIES: GEO

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Salinity induced gene expression profiling in 8 diverse rice genotypes

Project description:Whole genome transcriptional responses is profiled in the 0 & 120 mM NaCl stressed whole seedlings of four indica (Pokkali, PSBRc50, IR 58, BRRI dhan 29), two Japonica (Banikat, Nipponbare) and two wild (O. latifolia, O. Rufipogon) accessions of rice (that showed varied level of tolerance to salt stresses) to identify the salinity induced transcripts. Stress was imposed on 14 day old seedlings and total RNA from the whole seedlings was collected after 48 h of stressed period (i.e., from 16 day old seedlings). These data sets were used for two different analyses. Firstly, the gene expression responses of eight rice genotypes was interrogated by the weighted continuous morpho-physiological trait responses (on a scale of 0 to 1) using a modified version of the â??Significance Analysis of Microarraysâ?? (SAM) to identify the genes whose expression changes significantly and which is relative to the changes in morpho-physiological traits over these rice genotypes. Secondly, the differentially expressed significant salinity induced genes were also identified in the tolerant and in the susceptible genotypes using Gene-spring software. The genes that enriched the important biological processes and molecular functions (as identified by Gene Ontology: Singular enrichment analysis) are discussed in a way to explain the roles of these genes in overall stress adaptation mechanism. Fourteen day old whole seedlings of 8 rice genotypes were treated with 0 & 120 mM NaCl stress for 48 hours each with three replications and the gene expressions were measured using Agilent Rice Gene Expression 4x44K Microarray.

2016-03-10 | E-GEOD-79043 | biostudies-arrayexpress

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Project description:Climate change is affecting crop production due to soil salinization and water scarcity, and is predicted to worsen in the coming years. Rice is a major staple food and the most salt-sensitive cereal. High salinity in the soil triggers several adaptive responses in rice to cope with osmotic and ionic stress at the physiological, cellular and molecular levels. A major QTL for salinity tolerance, named Saltol, is present on chromosome 1 of Indian rice landrace varieties such as Pokkali and Nona Bokra. In this study, we characterized the physiological and early proteomic responses to salinity in FL478, an inbred rice line harboring the Saltol region. For this, plantlets were cultured in hydroponic cultures with 100 mM NaCl and evaluated at 6, 24 and 48h. At the physiological level, salinity significantly reduced shoot length after 48 h, whereas root length significantly increased. Moreover, the Na+/K+ ratio was maintained at lower levels in the shoots compared to the roots FL478 plantlets. On the other hand, roots showed a faster and more coordinated proteomic response than shoots, which was evident from only 6h of treatment. These responses were markedly related with transcription- and translation-related proteins. Moreover, roots exhibited a higher accumulation of stress-related proteins in response to salinity treatment, like peroxidase and SalT, which are both present in the Saltol QTL. Both, physiological and proteomic response, showed that roots respond in a highly adaptive manner to salinity stress compared to shoots, which suggests that this tissue is critical to the tolerance observed in varieties harbouring the Saltol region.

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Project description:Rice seedlings at 3-leaf stage were used for expression analysis in control and cold stressed (incloudling cold treatment for 3, 24hrs and recovery from cold stress for 24hrs) samples. Samples of shoots and roots from biological replicates of both genotypes were generated and the expression profiles were determined using Phalanx Rice OneArray＠ v1.

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