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- W2888788028 abstract "Ligustrum japonicum Thunb. (Oleraceae), called Japanese privet or waxleaf privet, is native to Japan and southern Korea. Owing to its attractive evergreen foliage, it is widely cultivated in other regions with warm temperate climates. This shrub is also naturalized in California and in the southeastern United States from Texas to Virginia (https://www.invasiveplantatlas.org/). In June 2016, hundreds of L. japonicum shrubs were found affected by a rust at a disease incidence of 50% in a public garden in Daegu (35°53′25″N; 128°35′01″E), Korea. Similar symptoms with typical rust pustules on this plant species were also found in Jinju (35°10′46″N; 128°05′48″E), Korea. Examination of an affected plant revealed that orange-yellow rust pustules were formed on the lower leaf surface with corresponding yellowish to chlorotic lesions on the upper surface. Four representative voucher specimens have been deposited in the Korea University herbarium (KUS-F29287, F29290, F29781, and F29797), Seoul, Korea. Morphological characteristics of the aecial stage were as follows. Spermogonia were epiphyllous, aggregated, initially yellow and becoming brown, subepidermal, and flask shaped. Aecia were hypophyllous, densely clustered, on leaves and occasionally also on branches, causing distortion and hypertrophy of the host, cupulate, deeply immersed in host mesophyll, 120 to 200 µm diameter, and yellowish. Peridia were prominent, easily splitting vertically, peridial cells oblong to polygonal, 22 to 36 × 16 to 22 µm, inner wall 4 to 6 µm thick, verrucose, outer wall 6 to 10 µm thick, smooth to finely verrucose. Aeciospores were angularly globose to ellipsoid, densely and minutely verrucose, subhyaline to pale yellowish, 16 to 28 × 16 to 22 µm, walls 1 to 2 µm thick. Morphological characteristics of the collections were in good agreement with the aecial stage of Puccinia klugkistiana (Dietel) J.X. Ji & Kakish. (Hiratsuka et al. 1992; Ji et al. 2017). To confirm the identification, genomic DNA was extracted from aeciospores of two dried herbarium specimens. The internal transcribed spacer (ITS) and large subunit (LSU) regions of rRNA gene were polymerase chain reaction (PCR) amplified using specific primer pairs ITS5u/ITS4rust and universal primers LR0R/LR6 as described by Beenken et al. (2017). PCR products were sequenced and deposited in GenBank (MH644179 and MH644180 for ITS; MH644181 and MH644182 for LSU). No ITS sequence of P. klugkistiana is available in the NCBI database, because this this the first sequence data for ITS of this rust species. LSU sequences from two representative isolates had 100% homology with that of Aecidium klugkistianum (HQ699078) from China. The aecial stage of P. klugkistiana has been reported on eight species/varieties of Ligustrum from East Asia including China, Japan, and Korea (Farr and Rossman 2018; Hiratsuka et al. 1992). In Korea, L. ibota and L. obtusifolium have been recorded as host plants of the aecial stage of P. klugkistiana (Hiratsuka 1942). To our knowledge, this is the first report of the aecial stage of P. klugkistiana on L. japonicum in Korea. Rust infection caused necrotic lesions, greatly detracting from the beauty of the glossy leaves." @default.
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- W2888788028 date "2019-01-01" @default.
- W2888788028 modified "2023-09-29" @default.
- W2888788028 title "First Report of Rust Caused by Aecial Stage of <i>Puccinia klugkistiana</i> on <i>Ligustrum japonicum</i> in Korea" @default.
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- W2888788028 doi "https://doi.org/10.1094/pdis-07-18-1233-pdn" @default.
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