The First Record of a North American Poplar Leaf Rust Fungus, Melampsora medusae, in China
| Autor: | Wei Zheng, Zhimin Cao, Die Hu, George Newcombe, Zijia Peng, Zhongdong Yu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Balsam 0303 health sciences exotic rust biology phylogenetics of Uredinales Range (biology) Forestry Context (language use) Melampsora lcsh:QK900-989 biology.organism_classification 01 natural sciences Rust biotic homogenization novel plant pathogen 03 medical and health sciences short rotation forestry Botany lcsh:Plant ecology Melampsora medusae 030304 developmental biology 010606 plant biology & botany Hybrid Urediniospore |
| Zdroj: | Forests, Vol 10, Iss 2, p 182 (2019) Forests Volume 10 Issue 2 |
| ISSN: | 1999-4907 |
| Popis: | A wide range of species and hybrids of black and balsam poplars or cottonwoods (Populus L., sections Aigeiros and Tacamahaca) grow naturally, or have been introduced to grow in plantations in China. Many species of Melampsora can cause poplar leaf rust in China, and their distributions and host specificities are not entirely known. This study was prompted by the new susceptibility of a previously resistant cultivar, cv. &lsquo Zhonghua hongye&rsquo of Populus deltoides (section Aigeiros), as well as by the need to know more about the broader context of poplar leaf rust in China. Rust surveys from 2015 through 2018 in Shaanxi, Sichuan, Gansu, Henan, Shanxi, Qinghai, Beijing, and Inner Mongolia revealed some samples with urediniospores with the echinulation pattern of M. medusae. The morphological characteristics of urediniospores and teliospores from poplar species of the region were further examined with light and scanning electron microscopy. Phylogenetic analysis based on sequences of the rDNA ITS region (ITS1, 5.8S rRNA gene, and ITS2) and the nuclear large subunit rDNA (D1/D2) was used to further confirm morphology-based identification. Based on combined analyses, five of the fifteen fully characterized samples were identified as Melampsora medusae: one from Shaanxi and four from Sichuan. Two of the five were from Populus deltoides cv. &lsquo Three others were identified on Populus szechuanica, P. simonii, and P. yunnanensis. Additional samples of M. medusae were collected in Shaanxi in 2017 and 2018, and from Henan in 2015 through 2018. Altogether these findings show that this introduced pathogen is widespread and persistent from year to year in China. This is the first report of this North American poplar leaf rust species, Melampsora medusae, in China. It has previously been reported outside North America in Argentina, Europe, Australia, New Zealand, Japan, and Russia. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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