a Department of Plant and Soil Sciences , Forestry and Agricultural Biotechnology Institute, University of Pretoria , Pretoria 0028 , South Africa.
b Department of Biochemistry, Genetics and Microbiology , Forestry and Agricultural Biotechnology Institute, University of Pretoria , Pretoria 0028 , South Africa.
Mycologia. 2019 Jan-Feb;111(1):78-102. doi: 10.1080/00275514.2018.1522179. Epub 2019 Jan 18.
Vietnam and Indonesia have rapidly growing and extensive plantation forestry programs, especially of Acacia spp. and Eucalyptus spp. As these plantations expand, the threat from pests and diseases also increases. Calonectria species are among those pathogens causing diseases of trees in plantations and nurseries in these countries. Extensive surveys were conducted across plantations and nurseries of Vietnam and parts of Indonesia, where a large number of Calonectria isolates were retrieved from diseased leaves and soils associated with symptomatic trees. The aim of this study was to identify and resolve the phylogenetic relationships among these isolates using DNA sequence comparisons of four gene regions as well as morphological characters. From a collection of 165 isolates, the study revealed five known and 10 undescribed species. The relatively high diversity of Calonectria species found in this study supports the view that many more species in this genus remain to be discovered in other areas of Southeast Asia.
越南和印度尼西亚拥有快速发展和广泛的人工林种植项目，特别是种植金合欢属和桉树属。随着这些种植园的扩张，病虫害的威胁也在增加。Calonectria 物种是导致这些国家种植园和苗圃树木患病的病原体之一。在越南各地的种植园和苗圃以及印度尼西亚的部分地区进行了广泛的调查，从与有症状的树木相关的患病叶片和土壤中提取了大量的 Calonectria 分离株。本研究的目的是使用四个基因区域的 DNA 序列比较以及形态特征来识别和解决这些分离株之间的系统发育关系。从 165 个分离株的集合中，研究揭示了五个已知和十个未描述的种。本研究中发现的 Calonectria 种的相对高多样性支持了这样一种观点，即在东南亚的其他地区可能还有更多的种尚未被发现。
