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Rice plants exhibiting bacterial blight resistance at high temperature suppress abiotic response

ABSTRACT: Background: Plant disease is a major challenge to agriculture worldwide, and it is often exacerbated by abiotic environmental factors. During some plant-pathogen interactions, heat stress increases host susceptibility, a tendency which could spell disaster in light of the global warming trends associated with climate change. Despite the importance of this phenomenon, little is known about the molecular mechanisms that cause it. To better understand host plant responses during simultaneous heat and pathogen stress, we conducted a transcriptomics experiment for rice plants infected with Xanthomonas oryzae (Xo), an economically important bacterial pathogen of rice, during high temperature stress. Results: Using RNA-Seq technology, 8,499 differentially expressed genes were identified as temperature responsive in one rice cultivar, IRBB61, experiencing susceptible and resistant interactions with Xo across three time points. Many genes with gene ontology terms associated with stress response were identified. Notably, genes in the plant hormone abscisic acid (ABA) biosynthesis and response pathways were identified as upregulated by high temperature in both mock-treated plants and plants in the susceptible interaction and suppressed by high temperature in plants in the resistant interaction. A DNA sequence motif similar to known ABA-responsive cis-regulatory elements was identified in the promoter region upstream of genes upregulated in susceptible but downregulated in resistant interactions. Conclusions: The results of our study suggest that the plant hormone ABA is an important node for cross-talk between plant transcriptional response pathways to high temperature stress and pathogen attack. Genes in this pathway represent an important focus for future study to determine how plants evolved to deal with simultaneous abiotic and biotic stresses.

ORGANISM(S): Oryza sativa Indica Group

PROVIDER: GSE95668 | GEO | 2017/11/07

SECONDARY ACCESSION(S): PRJNA377880

REPOSITORIES: GEO

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Project description:Purpose: To study the differential gene expression by comparing resistant and susceptible rice cultivars against the rice blast fungus M. Oryzae. Methods: Rice leaves were collected after M. Oryzae (MO36) infection from resistant and susceptible cultivars, preserved on deep freezer on -80O C frozen on liquid nitrogen, Total RNA from rice plant tissues was extracted using RNeasy Plant Mini Kit (Qiagen) by following manufacturer protocol. RNA libraries were prepared for sequencing using standard Illumina protocols. Results: Around 35 million pairs of filtered 150 base paired reads were obtained for each biological sample. These reads were mapped against RGAP7 using reference assembly tool of CLC Genomics Workbench. The mapped read data was summarised in to a matrix for each sample. count data was compared between the samples to identify the differentially expressed genes. genes were further filtered based on fold change, p value and FDR p value. The count data was further statistically analysed using Kal's Z test integrated into CGWB. Genes exhibiting 3 fold change and FDR p value <0.05 were filtered as either up regulated or down regulated gene. we obtained 7577 and 4290 significant (FDR adjusted p value ≤0.05) differentially expressed locus id in the resistant and susceptible rice cultivars, respectively . The number of significant DEL with fold change value greater and less than 3 were 3523 upregulated 4054 downregulated and 2190 upregulated & 2100 downregulated in resistance and susceptible cultivars, respectively. 2-way and and 4-way upregulated and downregulated gene comparisions was carried out. To identify the changes in biological process and molecular function the pathway and gene set enrichment analysis was performed in resistant BR2655 and susceptible HR12 rice cultivars. Conclusions: This study represents the first transcriptome analysis of resistant BR2655 and susceptible HR12 upon M.oryzae infection, generated by RNA-seq technology. This transcriptome analysis further helps to understand the differential gene expression analysis response to the M.oryzae. And candidate genes which are involved in triggering defense mechanism in rice plants. Further it helps to understand the mechanism of activating a cascade of defense responses in resistant and susceptible plants.

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Rice plants exhibiting bacterial blight resistance at high temperature suppress abiotic response

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