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Friday, October 14, 2016
Friday, October 14, 2016
  • 7th International Rice Blast Conference Rice blast disease remains the most destructive disease of cultivated rice worldwide. Considering that rice is the staple food for more than half of the human population, the disease is a significant threat to food security for many nations. It is, therefore, imperative to devise the novel and stable control strategies for the disease, which requires an understanding of the pathogen, rice blast fungus, and its interaction with rice or other host plants. The International Rice Blast Conference (IRBC) has been the forum to foster collaboration in rice blast research among scientists around the world. Not surprisingly, much progress has been made on the research of the biology, genomics, host-pathogen interactions, resistance, and disease management of rice blast since the last IRBC in Jeju, South Korea, in 2013. To share recent advancements in the scientific research and broaden our understanding of the disease, we host the IRBC07 in Manila, Philippines.

    Event site: http://irbc07.irri.org :: IRRI Events

  • IRRI Board of Trustees Meeting  :: IRRI Events

  • 02:00pm - 03:00pm  PB & GB Special Joint Division Seminar PB & GB Special Joint Division Seminar
    (Please click “Add to calendar” to mark it in your calendar. We will not circulate reminders)

    MicroRNAs (miRNAs) in rice innate immunity

    Blanca San Segundo
    Professor of Research
    Spanish Research Council (CSIC)
    Center for Research in Agricultural Genomics

    1400-1500H, Friday, 14 October 2016
    PBGB Conference Room 1
    NC Brady Laboratory Bldg.


    MicroRNAs (miRNAs) are short regulatory non-coding RNAs that guide gene silencing by triggering sequence-specific cleavage or translational repression of target transcripts. Plant miRNAs are known to play important roles in a wide range of developmental processes and adaptive responses to abiotic stress (drought, cold, salinity and nutrient deficiency) and biotic stress (e.g. antibacterial resistance). During the last years, the adoption of high-throughput sequencing technologies has significantly contributed to uncover multiple miRNAs while allowing miRNA profiling in rice. Although a substantial fraction of the rice miRNA transcriptome has been shown to be responsive to infection by the rice blast fungus Magnaporthe oryzae, the exact role of most of these pathogen-regulated miRNAs in rice immunity remains elusive.
    To obtain a genome-wide survey of miRNAs in rice and their responsiveness to M. oryzae, we constructed small RNA libraries from rice leaves that have been treated, or not, with M. oryzae elicitors. This study allowed us to identify not only known miRNAs, but also previously unknown miRNAs (novel miRNAs) from rice whose expression is affected by treatment with fungal elicitors. The contribution of several elicitor-regulated miRNAs in resistance to blast disease has been confirmed in transgenic rice, including miRNAs controlling the expression of genes involved in nutrient homeostasis. Pathogen-regulated miRNAs can function as positive or negative regulators of the rice defense response to M. oryzae. Combined small RNA and degradome analyses revealed regulatory networks enriched in elicitor-regulated miRNAs supported by the identification of their corresponding target genes. Specifically, we identified an important number of miRNA/target gene pairs involved in small RNA pathways, hormone signaling and crosstalk among hormone pathways having great potential in regulating rice immunity. These findings support that miRNAs, and their corresponding target genes, represent an integral part of the rice response to infection by the blast fungus M. oryzae.  :: IRRI Events