02196nas a2200157   4500008004100000022001400041245011600055210006900171300001200240490000700252520161600259100002001875700002001895700002301915856010001938       1991                        eng d  a0953-756200aTaxonomic structure of Phytophthora cryptogea and P. drechsleri based on isozyme and mitochondrial DNA analyses0 aTaxonomic structure of Phytophthora cryptogea and P drechsleri b  a31 - 480 v953 a<p>Intra- and interspecific isozyme variation was evaluated for 123 isolates assigned to either <em>Phytophthora cryptogea</em> or <em>P. drechsleri</em>, and compared with that of 15 isolates of <em>P. erythroseptica</em> and 11 isolates of <em>P. lateralis</em>. Isolates of <em>P. cryptogea</em> and <em>P. drechsleri</em> were from worldwide sources and displayed a high degree of variability. The majority of these isolates were subsequently divided into ten distinct groups based on numerical analysis of 24 putative enzyme loci. None of the enzyme loci were monomorphic for all ten groups. Analysis of mitochondrial (mt) DNA restriction fragment length polymorphisms of selected isolates from each isozyme group supported the isozyme data. Differences in morphological features of the ten isozyme groups of <em>P. cryptogea</em> and <em>P. drechsleri</em> were not sufficiently distinct to readily distinguish between them. Isozyme analysis of <em>P. erythroseptica</em> revealed that it is a uniform and distinct taxon. The isolates of <em>P. lateralis</em> also formed a homogeneous and discrete group. An interspecific comparison revealed that the variation among the ten isozyme groups of <em>P. cryptogea</em> and <em>P. drechsleri</em> was as great as that observed among <em>P. cinnamomi, P. cambivora, P. lateralis, P. erythroseptica</em> and <em>P. richardiae</em>. The combined results of isozyme and mtDNA analysis indicate that there are at least seven distinct molecular species represented by the 123 isolates of <em>P. cryptogea</em> and <em>P. drechsleri</em> evaluated in this study.</p>1 aMills, Scott, D1 aFörster, Helga1 aCoffey, Michael, D  uhttp://www.sciencedirect.com/science/article/B7XMR-4VN66D4-6/2/554a78ec5ee059d8f8ca3d1ba95638fd