| Autor: |
T. JUNG 1,2 *, P.Q. THU 3, M.C. NGUYEN 3, V.T. DAM 4, A. PÉREZ-SIERRA5, H. REES 5, B. SCANU 6, J. BAKONYI 7, D. SERESS 7, C. MAIA1 , A. HARRIS 5, J.F. WEBBER 5, C.M. BRASIER 5, M. HORTA JUNG 1 |
| Rok vydání: |
2016 |
| Předmět: |
|
| DOI: |
10.5281/zenodo.1435060 |
| Popis: |
Many devastating tree declines are driven by non-native Phytophthora species which remain unnoticed in their native environment and after introduction to other continents became invasive, threatening a non-coevolved highly susceptible flora. There is an accumulating body of evidence that many important Phytophthora pathogens with global distribution are native to Southeast Asia suggesting this region might be one center of origin of the genus Phytophthora. Therefore, a 5 weeks Phytophthora survey was conducted in spring 2016 in 23 forest stands (tropical rainforests and montane forests) between 12 and 2903 m altitude in 4 National Parks, in 10 natural rivers and streams and in 14 rubber tree plantations across Vietnam. Using classical and molecular identification, the 793 oomycete isolates obtained could be assigned to 18 known species and informally designated taxa of Phytophthora, 21 new Phytophthora taxa, a diverse array of known and new taxa of Phytopythium, Pythium and Elongisporangium including 15 genotypes from the Phytopythium vexans complex, and a new sister genus of Phytophthora which is informally designated as Nothophytophthora gen. nov. The results from the Vietnamese survey contribute to clarify the origin of the two most destructive invasive Phytophthora pathogens of trees and natural ecosystems. Detailed morphological and physiological studies, sequencing of additional gene regions and multigene phylogenetic analyses are underway to characterise and officially describe the new Phytophthora species from Vietnam and the new genus Nothophytophthora. Soil infestation trials will be performed to test the potential threat posed by new Phytophthora species from Vietnam to European forests. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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