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- W1490562629 abstract "Hybrids of Lilium spp. are grown on a large scale (1·2 ha) in greenhouses for cut flower production at a nursery in Dabas, a town 40 km south-east of Budapest. In 2000, 10–20% of the plants of cvs Stargazer and London were severely diseased. Some bulbs did not emerge, while others developed a soft rot with lesions spreading from the base or middle of the stem into the leaves. The pathogen developing in diseased tissues appeared to be a Phytophthora species. It had aseptate hyphae and sporangia were papillate, both caducous and noncaducous, and their shape ranged from ovoid to elongate and distorted. The six isolates recovered from diseased plants and soil samples looked very similar on selective media (Jeffers & Martin, 1986). They developed white colonies with abundant aerial mycelia, and had a maximum growth temperature of 36·5°C on pea-agar medium. Sporangia, 43·9 ± 1·35 µm long and 33·2 ± 0·8 µm wide, were noncaducous and ellipsoidal to ovoid in shape; distorted shapes were not observed in culture. Chlamydospores, 34·9 ± 1·13 µm in diameter, were terminal or intercalary and formed singly. Oospores were not observed. These characteristics were consistent with a heterothallic species such as P. nicotianae (syn. P. parasitica) (Erwin & Ribeiro, 1996). Upon mating with an A1 mating-type isolate of P. nicotianae, the isolates formed oogonia (23·3 ± 0·65 µm diameter), amphigynous antheridia 10·5 ± 0·75 µm long and 11·0 ± 0·52 µm wide and, eventually, aplerotic oospores 19·9 ± 1·0 µm diameter, indicating that these isolates were A2 mating type. Pathogenicity was confirmed by inoculating unwounded stem bases or leaves of both lily hybrids with zoospore suspensions. Symptoms and disease development were similar to those observed on naturally infected plants; cv. London appeared to be more susceptible than Stargazer. Isolates were also pathogenic on tomato following stem inoculation. PCR amplification of genomic DNA using the P. nicotianae-specific primer pair ITS3–PNIC1 (Tooley et al., 1997) generated a 455 bp sequence, confirming that the pathogen was P. nicotianae. This is the first record of Phytophthora blight of lily in Hungary, and possibly in continental Europe." @default.
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- W1490562629 date "2001-12-01" @default.
- W1490562629 modified "2023-10-18" @default.
- W1490562629 title "<i>Phytophthora nicotianae</i> causes blight of lily in Hungary" @default.
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- W1490562629 doi "https://doi.org/10.1046/j.1365-3059.2001.00618.x" @default.
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