Magnaporthe oryzae Populations Adapted to Finger Millet and Rice Exhibit Distinctive Patterns of Genetic Diversity, Sexuality and Host Interaction

被引:0
作者
J. P. Takan
J. Chipili
S. Muthumeenakshi
N. J. Talbot
E. O. Manyasa
R. Bandyopadhyay
Y. Sere
S. K. Nutsugah
P. Talhinhas
M. Hossain
A. E. Brown
S. Sreenivasaprasad
机构
[1] University of Warwick,Institute of Research in Applied Natural Sciences (LIRANS), Division of Science, Faculty of Creative Arts, Technologies and Science
[2] NaSARRI,undefined
[3] Ministry of Agriculture,undefined
[4] University of Exeter,undefined
[5] ICRISAT,undefined
[6] IITA,undefined
[7] ARC-WARDA,undefined
[8] SARI,undefined
[9] CIFC/IICT,undefined
[10] BRRI,undefined
[11] Queen’s University,undefined
[12] University of Bedfordshire,undefined
来源
Molecular Biotechnology | 2012年 / 50卷
关键词
Finger millet; Rice; Blast disease; Pathogen populations; Genetic diversity; Mating type distribution; Fertility status; Pathogenicity; Adaptive divergence;
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学科分类号
摘要
In this study, host-specific forms of the blast pathogen Magnaporthe oryzae in sub-Saharan Africa (SSA) were characterised from distinct cropping locations using a combination of molecular and biological assays. Finger millet blast populations in East Africa revealed a continuous genetic variation pattern and lack of clonal lineages, with a wide range of haplotypes. M. oryzae populations lacked the grasshopper (grh) element (96%) and appeared distinct to those in Asia. An overall near equal distribution (47–53%) of the mating types MAT1-1 and MAT1-2, high fertility status (84–89%) and the dominance of hermaphrodites (64%) suggest a strong sexual reproductive potential. Differences in pathogen aggressiveness and lack of cultivar incompatibility suggest the importance of quantitative resistance. Rice blast populations in West Africa showed a typical lineage-based structure. Among the nine lineages identified, three comprised ~90% of the isolates. Skewed distribution of the mating types MAT1-1 (29%) and MAT1-2 (71%) was accompanied by low fertility. Clear differences in cultivar compatibility within and between lineages suggest R gene-mediated interactions. Distinctive patterns of genetic diversity, sexual reproductive potential and pathogenicity suggest adaptive divergence of host-specific forms of M. oryzae populations linked to crop domestication and agricultural intensification.
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页码:145 / 158
页数:13
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