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DUAL RNASeq ANALYSIS REVEALS AN INCREASE OF FUNGAL PATHOGENICITY FUNCTIONS AND A ROLE OF PLANT GLUTAMINE SYNTHETASE IN NITROGEN-INDUCED SUSCEPTIBILITY TO THE RICE BLAST FUNGUS

ABSTRACT: In order to understand the mechanisms of Nitrogen induced susceptibility (NIS) we’ve conducted a dual RNAseq experiment on rice infected tissues by Magnaporthe oryzae. At 0 day post inoculation and 2 days post inoculation tissues have been collected on mock inoculated and M. oryzae inoculated plants. Rice were conducted under two type of nitrogen fertilization: 0N all fertilization but nitrogen, 1N all fertilization and NH4NO3. The fertilization was applied one day before inoculation. RNAseq was conducted both on rice and fungal RNA.

ORGANISM(S): Oryza sativa Pyricularia oryzae

PROVIDER: GSE83219 | GEO | 2016/10/31

SECONDARY ACCESSION(S): PRJNA325291

REPOSITORIES: GEO

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Project description:The rice blast fungus, Magnaporthe oryzae is a destructive pathogen of rice and other related crops, causing significant yield losses worldwide. Endogenous small RNAs (sRNAs), including small interfering RNAs (siRNAs) and microRNAs (miRNAs) are critical components of gene regulation in many eukaryotic organisms. Recently several new species of sRNAs have been identified in fungi. This fact along with the availability of genome sequence makes M. oryzae a compelling target for sRNA profiling. We have examined sRNA species and their biosynthetic genes in M. oryzae, and the degree to which these elements regulate fungal stress responses. To this end, we have characterized sRNAs under different physiological stress conditions, which had not yet been examined in this fungus. The resulting libraries are composed of more than 37 million total genome matched reads mapping to intergenic regions, coding sequences, retrotransposons, inverted, tandem, and other repeated regions of the genome with more than half of the small RNAs arising from intergenic regions. The 24 nucleotide (nt) size class of sRNAs was predominant. A comparison to transcriptional data of M. oryzae undergoing the same physiological stresses indicates that sRNAs play a role in transcriptional regulation for a small subset of genes. Support for this idea comes from generation and characterization of mutants putatively involved in sRNAs biogenesis; our results indicate that the deletion of Dicer-like genes and an RNA-Dependent RNA Polymerase gene increases the transcriptional regulation of this subset of genes, including one involved in virulence. Various physiological stressors and in planta conditions alter the small RNA profile of the rice blast fungus. Characterization of sRNA biosynthetic mutants helps to clarify the role of sRNAs in transcriptional control. Examination of small RNA populations of eight mycelial as well as In planta tissues of M. oryzae strain 70-15. Mycelia grown in complete medium (CM), minimal medium (MM), carbon starved medium (CS: MM lacking carbon source), nitrogen starved medium (NS: MM lacking nitrogen source) and a reactive oxygen species-rich environment generated by amendment of Paraquat (PQ) to the CM. In planta tissues include mock inoculated rice leaves (LMg0), 72 hours post-inoculation in rice leaves (LMg72) and 96 hours post-inoculation in rice leaves (LMg96).

Dataset Information

DUAL RNASeq ANALYSIS REVEALS AN INCREASE OF FUNGAL PATHOGENICITY FUNCTIONS AND A ROLE OF PLANT GLUTAMINE SYNTHETASE IN NITROGEN-INDUCED SUSCEPTIBILITY TO THE RICE BLAST FUNGUS

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