Outbreak of Rice Blast Disease at Yeoju of Korea in 2020

Abstract

Rice blast is the most destructive disease threatening stable rice production in rice-growing areas. Cultivation of disease-resistant rice cultivars is the most effective way to control rice blast disease. However, the rice blast resistance is easy to breakdown within years by blast fungus that continually changes to adapt to new cultivars. Therefore, it is important to continuously monitor the incidence of rice blast disease and race differentiation of rice blast fungus in fields. In 2020, a severe rice blast disease occurred nationwide in Korea. We evaluated the incidence of rice blast disease in Yeoju and compared the weather conditions at the periods of rice blast disease in 2019 and 2020. We investigated the races and avirulence genes of rice blast isolates in Yeoju to identify race diversity and genetic characteristics of the isolates. This study will provide empirical support for rice blast control and the breeding of blast-resistant rice cultivars.

Natural Product Citronellal can Significantly Disturb Chitin Synthesis and Cell Wall Integrity in Magnaporthe oryzae

“…M. oryzae can cause rice blast, which poses a serious threat to rice yields worldwide [36,37]. As a result, natural products with a low toxicity to non-target organisms have attracted a widespread attention of researchers [38].…”

Wild grass isolates of Magnaporthe (Syn. Pyricularia) spp. from Germany can cause blast disease on cereal crops

“…All samples were sequenced with a depth between 105X and 146X and a mean read length of >20kb (read N50 >30kb) ( Tables S4 and S5 ). Long reads were assembled into contigs and corrected using Flye (v2.9-b1768) [60], and polished with long reads using Medaka (v1.4.3) (https://github.com/nanoporetech/medaka). All assemblies were additionally polished using short read Illumina sequencing technologies (San Diego, USA) through two consecutive iterations of Pilon (v1.23) [61].…”

“…All samples were sequenced with a depth between 105X and 146X and a mean read length of >20kb (read N50 >30kb) (Tables S4 and S5). Long reads were assembled into contigs and corrected using Flye (v2.9-b1768) [60], and polished with long reads using Medaka (v1. and ERR9883756 (GE3) and ERR9866258 and ERR9866259 (GE16_2).…”

“…Locations of blast fungus samples plotted are those of the 417 M. oryzae and M. grisea samples which were used for SNP-based phylogenetic analyses (Table S2). In addition, locations of blast fungus reports from Russia [59] and Korea [60], as well as the location of reports of rice and wheat blast fungus from CABI, the Invasive Species Compendium, were plotted. If the exact coordinates of a sample were unknown, the coordinates of the county's geographical center were plotted ( Table S1).…”

Comparison of projected rice blast epidemics in the Korean Peninsula between the CMIP5 and CMIP6 scenarios

“…Field observations showed irregular but severe occurrences of panicle blast depending on weather conditions from 1999 to 2008 (Lee et al 2010 ). Chung et al ( 2022 ) recently reported severe rice blast outbreaks occurred nationwide in 2020 in South Korea. Not only in South Korea, rice blast is also a major endemic yield reducer in rice production in North Korea, as inferred from many previous studies (Chen et al 2014 ; Chung et al 2019 ; Guo et al 2018 ; Kim 1999 ).…”