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

Takan , J P and Chipili, J and Muthumeenakshi, S and Talbot, N J and Manyasa, E O and Bandyopadhyay, R and Sere, Y and Nutsugah, S K and Talhinhas, P and Hossain, M and Brown, A E and Sreenivasaprasad, S (2012) Magnaporthe oryzae Populations Adapted to Finger Millet and Rice Exhibit Distinctive Patterns of Genetic Diversity, Sexuality and Host Interaction. Reviews in Molecular Biotechnology, 50 (2). pp. 145-158. ISSN 1559-0305

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Abstract

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

Item Type:	Article
Divisions:	UNSPECIFIED
CRP:	UNSPECIFIED
Uncontrolled Keywords:	Finger millet; Rice; Blast disease; Magnaporthe oryzae; Pathogen populations; Genetic diversity; Mating type distribution; Fertility status; Pathogenicity; Adaptive divergence
Subjects:	Mandate crops > Millets
Depositing User:	Ms K Syamalamba
Date Deposited:	28 Aug 2014 04:20
Last Modified:	28 Aug 2014 04:20
URI:	http://oar.icrisat.org/id/eprint/8293
Official URL:	http://dx.doi.org/10.1007/s12033-011-9429-z
Projects:	UNSPECIFIED
Funders:	UNSPECIFIED
Acknowledgement:	UNSPECIFIED
Links:	Google Scholar

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