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Title: Meiosis Drives Extraordinary Genome Plasticity in the Haploid Fungal Plant Pathogen Mycosphaerella graminicola

Journal Article · · PLoS ONE
 [1];  [2];  [3];  [3];  [4];  [5];  [6];  [2];  [2]
  1. Wageningen Univ. (Netherlands). Research Centre. Plant Research International B.V.; Wageningen Univ. (Netherlands). Dept. of Plant Sciences. Lab. of Plant Breeding. Graduate School of Experimental Plant Sciences; DOE/OSTI
  2. Wageningen Univ. (Netherlands). Research Centre. Plant Research International B.V.
  3. Wageningen Univ. (Netherlands). Research Centre. Plant Research International B.V.; Wageningen Univ. (Netherlands). Research Centre. Dept. of Plant Sciences. Lab. of Phytopathology. Graduate School Experimental Plant Sciences
  4. Purdue Univ., West Lafayette, IN (United States). U.S. Dept. of Agriculture (USDA). Agricultural Research Service (ARS). Crop Production and Pest Control Research Unit. Dept. of Botany and Plant Pathology
  5. Diversity Arrays P/L, Yarralumla, Canberra, Australian Capital Territory (Australia)
  6. Wageningen Univ. (Netherlands). Research Centre. Plant Research International B.V.; Wageningen Univ. (Netherlands). Dept. of Plant Sciences. Lab. of Plant Breeding. Graduate School of Experimental Plant Sciences

Meiosis in the haploid plant-pathogenic fungus Mycosphaerella graminicola results in eight ascospores due to a mitotic division following the two meiotic divisions. The transient diploid phase allows for recombination among homologous chromosomes. However, some chromosomes of M. graminicola lack homologs and do not pair during meiosis. Because these chromosomes are not present universally in the genome of the organism they can be considered to be dispensable. To analyze the meiotic transmission of unequal chromosome numbers, two segregating populations were generated by crossing genetically unrelated parent isolates originating from Algeria and The Netherlands that had pathogenicity towards durum or bread wheat, respectively. Detailed genetic analyses of these progenies using high-density mapping (1793 DArT, 258 AFLP and 25 SSR markers) and graphical genotyping revealed that M. graminicola has up to eight dispensable chromosomes, the highest number reported in filamentous fungi. These chromosomes vary from 0.39 to 0.77 Mb in size, and represent up to 38% of the chromosomal complement. Chromosome numbers among progeny isolates varied widely, with some progeny missing up to three chromosomes, while other strains were disomic for one or more chromosomes. Between 15–20% of the progeny isolates lacked one or more chromosomes that were present in both parents. The two high-density maps showed no recombination of dispensable chromosomes and hence, their meiotic processing may require distributive disjunction, a phenomenon that is rarely observed in fungi. The maps also enabled the identification of individual twin isolates from a single ascus that shared the same missing or doubled chromosomes indicating that the chromosomal polymorphisms were mitotically stable and originated from nondisjunction during the second division and, less frequently, during the first division of fungal meiosis. High genome plasticity could be among the strategies enabling this versatile pathogen to quickly overcome adverse biotic and abiotic conditions in wheat fields.

Research Organization:
USDOE Joint Genome Institute (JGI), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Earth and Environmental Systems Science Division
OSTI ID:
1627374
Journal Information:
PLoS ONE, Journal Name: PLoS ONE Journal Issue: 6 Vol. 4; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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