Journal
PHYSIOLOGICAL AND MOLECULAR PLANT PATHOLOGY
Volume 95, Issue -, Pages 27-31Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.pmpp.2016.02.009
Keywords
Alternaria alternata; Host-selective toxin; Evolution; Conditionally dispensable chromosome
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Funding
- Japanese Society for Promotion of Sciences [19108001, 21228001, 23248007, 20380028, 23380025, 15K14662]
- Special Coordination Funds for Promoting Sciences from the Ministry of Education, Culture, Sports, Science, and Technology of Japan
- Grants-in-Aid for Scientific Research [21228001, 23248007, 26252007, 19108001, 15K14662, 23380025, 20380028] Funding Source: KAKEN
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Alternaria alternata includes seven pathogenic variants, called pathotypes, which produce host-selective toxins (HSTs) as determinant factors for pathogenicity. The gene clusters for HST biosynthesis were identified from six pathotypes (Japanese pear, strawberry, tangerine, apple, tomato and rough lemon) and were found to reside on small chromosomes of <2.0 Mb in most strains tested. We isolated mutants lacking the small chromosomes from the strawberry, apple and tomato pathotypes and showed that the small chromosomes are dispensable for growth. In this review, we summarize our current understanding of the evolution of pathogenicity controlled by small, dispensable chromosomes in Alternaria alternata pathogens. (C) 2016 Elsevier Ltd. All rights reserved.
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