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45 57 62 Érsek, T. and Nagy, Z. Á. (2008): Species hybrids in the genus Phytophthora with emphasis on the alder pathogen Phytophthora alni

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Phytophthora alni is a species hybrid that causes a destructive root and collar rot disease of alders throughout Europe. Its subspecies, P. alni subsp. alni (Paa), P. alni subsp. uniformis (Pau) and P. alni subsp. multiformis (Pam) can be distinguished on the basis of phenotypic and genotypic traits. In this study, we report evidence of an unusual genomic combination of two subspecies occurring in two P. alni isolates from Hungary. These isolates, which had previously been identified as Paa using hybrid-specific PCR primers and morphological traits, exhibited a mitochondrial DNA restriction pattern identical to that of Pau. However, RAPD patterns and isozyme profiles of nuclear genes encoding glucose-phosphate isomerase (Gpi) and malate dehydrogenase (Mdh) of the two atypical isolates were identical to those found in all Paa isolates. Isozyme analysis also revealed a novel allele at the putative Mdh-1 locus in Paa and Pam isolates. The atypical Paa isolates have likely emerged as a result of hybridization events in the P. alni population between Paa and Pau .

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Érsek, T., English, J. T. and Schoelz, J. E. (1995): Creation of species hybrids of Phytophthora with modified host ranges by zoospore fusion. Phytopathology 85, 1343-1347. Creation of species hybrids of Phytophthora with

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Biologia Futura
Authors: Zoltán Attila Köbölkuti, Klára Cseke, Attila Benke, Mátyás Báder, Attila Borovics and Róbert Németh

been reported not only in crop species ( Decroocq et al., 2003 ; Feng et al., 2009 ) but also in Populus ( Du et al., 2013 ). Our – on P. trichocarpa sequences designed – 55 primers on 23 different poplar species/hybrid DNA samples successfully

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Hybridisation between Primula vulgaris and P. veris was investigated along a southwest exposed slope in a woodland in Hungary. Parent species and hybrids were identified by colour and size of the flowers. The two morphs within each taxon showed only slight differences, but discrimination of the three taxa was unambiguous. Scape and pedicel length proved to be suitable for distinguishing hybrids from P. veris on the basis of inflorescence architecture. Seed yield components showed considerable differences between the two parent species: P. veris produced more and lighter seeds per capsule than P. vulgaris did. Hybrids also differed significantly from the parent species: hybrids had the fewest and heaviest seeds per capsule among the three taxa. The two parent species did not show the slightest sign of gender specialisation: fruit number per plant, fruit set, and seed number per capsule were equal in long-styled and short-styled morphs. The two morphs, however, were not equally successful in hybrids: fruit number per plant and fruit set were significantly lower in long-styled plants than in short-styled plants, although the long-styled morph with highly exserted stigmas was expected to be in more favourable situation for pollination.

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species hybrid clones derived from callus tissue. Am. J. Bot. 58, 257–262. Mee G.W. P. Morphologic, cytogenetic, and enzymatic variation in Saccharum species hybrid clones derived from

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