The architecture of the Plasmodiophora brassicae nuclear and mitochondrial genomes

Stjelja Arvelius, SuzanaSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för växtbiologi,Department of Plant Biology,Swedish Univ Agr Sci, Linnean Ctr Plant Biol, Uppsala BioCtr, Dept Plant Biol, POB 7080, SE-75007 Uppsala, Sweden (author)

Plasmodiophora brassicae is a soil-borne pathogen that attacks roots of cruciferous plants causing clubroot disease. The pathogen belongs to the Plasmodiophorida order in Phytomyxea. Here we used long-read SMRT technology to clarify the P. brassicae e3 genomic constituents along with comparative and phylogenetic analyses. Twenty contigs representing the nuclear genome and one mitochondrial (mt) contig were generated, together comprising 25.1 Mbp. Thirteen of the 20 nuclear contigs represented chromosomes from telomere to telomere characterized by [TTTTAGGG] sequences. Seven active gene candidates encoding synaptonemal complex-associated and meiotic-related protein homologs were identified, a finding that argues for possible genetic recombination events. The circular mt genome is large (114,663 bp), gene dense and intron rich. It shares high synteny with the mt genome of Spongospora subterranea, except in a unique 12 kb region delimited by shifts in GC content and containing tandem minisatellite- and microsatellite repeats with partially palindromic sequences. De novo annotation identified 32 protein-coding genes, 28 structural RNA genes and 19 ORFs. ORFs predicted in the repeat-rich region showed similarities to diverse organisms suggesting possible evolutionary connections. The data generated here form a refined platform for the next step involving functional analysis, all to clarify the complex biology of P. brassicae.

Fogelqvist, JohanSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för växtbiologi,Department of Plant Biology,Swedish Univ Agr Sci, Linnean Ctr Plant Biol, Uppsala BioCtr, Dept Plant Biol, POB 7080, SE-75007 Uppsala, Sweden(Swepub:slu)46819 (author)
Dixelius, ChristinaSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för växtbiologi,Department of Plant Biology,Swedish Univ Agr Sci, Linnean Ctr Plant Biol, Uppsala BioCtr, Dept Plant Biol, POB 7080, SE-75007 Uppsala, Sweden(Swepub:slu)48572 (author)
Tellgren-Roth, Christian,1971-Uppsala universitet,Institutionen för immunologi, genetik och patologi,Science for Life Laboratory, SciLifeLab(Swepub:uu)chrte903 (author)
Sveriges lantbruksuniversitetInstitutionen för växtbiologi (creator_code:org_t)
Sveriges lantbruksuniversitet

By the author/editor: Stjelja Arvelius ...; Fogelqvist, Joha ...; Dixelius, Christ ...; Tellgren-Roth, C ...

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By the university: Swedish University of Agricultural Sciences; Uppsala University

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