APS Homepage

POSTERS: Proteomics / metabolomics / genomics

Comparative genome analyses of four rice-infecting isolates of Rhizoctonia solani belonging to anastomosis group 1-intraspecific group IA (RsAG1-IA)
Da-Young Lee - Department of Plant Pathology, The Ohio State University. Shimin Zuo- Jiangsu Key Laboratory of Crop Genetics, Yangzhou University, Stephen Opiyo- Molecular and Cellular Imaging Center-Columbus, The Ohio State University, Ki-Tae Kim- Department of Agricultural Biotechnology, Seoul National University, Yong-Hwan

Rhizoctonia solani is a species complex composed of numerous isolates capable of infecting a wide range of economically important crops worldwide. Isolates belonging to R. solani anastomosis group 1-intraspecies group IA (AG1-IA) cause rice sheath blight (ShB), which significantly reduce the quantity and quality of rice production, threatening global food security. In this study, we sequenced the genomes of four Rhizoctonia solani AG1-IA isolates, namely B2 (USA), ADB (India), RNR (India) and YN-7 (China), using PacBio de novo sequencing and Illumina resequencing approaches. We obtained four high-quality genome sequences, comprised of 96 to 413 scaffolds with N50 values ranging from 1.21 Mb to 1.56 Mb. Genome synteny of approximately 66.4% to 70.9% was observed upon pairwise genome alignments, utilizing the B2 genome as the reference. Moreover, the genomes were predicted to harbor 9,722 to 11,505 putative protein coding genes, wherein 5,777 genes were identified to be shared by all four rice-infecting R. solani isolates. In addition, enrichment of polysaccharide lyase families (PLs) classified under carbohydrate-active enzymes (CAZymes) and pectin-degrading enzymes were observed, as well as the presence of monocot cell wall-degrading enzymes, which may have allowed the adaptation of rice-infecting R. solani isolates to their monocot host, rice. The outcomes of our study will enrich the R. solani genomic resource and allow better understanding of the pathogenicity of the rice sheath blight pathogen.