Origin of a new Phytophthora pathogen through interspecific hybridization

作者: C. M. Brasier , D. E. L. Cooke , J. M. Duncan

DOI: 10.1073/PNAS.96.10.5878

关键词:

摘要: Plant disease epidemics resulting from introductions of exotic fungal plant pathogens are a well known phenomenon. An associated risk—that accelerated pathogen evolution may be occurring as consequence genetic exchange between introduced, or introduced and resident, pathogens—is largely unrecognized. This is, in part, because examples natural, interspecific hybridization fungi very rare. Potential evolutionary developments range the acquisition new host specificities to emergence entirely taxa. We present evidence cytological behavior, additive nucleotide bases repetitive internal transcribed spacer regions rRNA-encoding DNA (rDNA), amplified fragment length polymorphisms total that new, aggressive Phytophthora alder trees Europe comprises heteroploid-interspecific hybrids involving cambivora-like species an unknown taxon similar fragariae. The hybrids’ marked developmental instabilities, unusual morphological variability, for recombination their profiles indicates they recent origin is continuing. likelihood such events increasing world trade plants intensifies. However, routine diagnostic procedures currently use insufficiently sensitive allow detection.

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