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.
journal_name
Mol Biotechnoljournal_title
Molecular biotechnologyauthors
Takan JP,Chipili J,Muthumeenakshi S,Talbot NJ,Manyasa EO,Bandyopadhyay R,Sere Y,Nutsugah SK,Talhinhas P,Hossain M,Brown AE,Sreenivasaprasad Sdoi
10.1007/s12033-011-9429-zsubject
Has Abstractpub_date
2012-02-01 00:00:00pages
145-58issue
2eissn
1073-6085issn
1559-0305journal_volume
50pub_type
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