A new genus and species of Cryphonectriaceae causing stem cankers on plantation eucalypts in South Africa

IF 2.3 3区农林科学 Q1 AGRONOMY

Plant Pathology Pub Date : 2024-02-25 DOI:10.1111/ppa.13883

Hiroyuki Suzuki, Seonju Marincowitz, Jolanda Roux, Trudy Paap, Brenda D. Wingfield, Michael J. Wingfield

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Abstract

Fungi in the Cryphonectriaceae are important canker pathogens of woody shrubs and trees in the Melastomataceae and Myrtaceae (Myrtales). During 2021 disease surveys in KwaZulu-Natal (South Africa) plantations, a serious stem canker disease was discovered on species of Eucalyptus and Corymbia. The cankers had structures on their surfaces typical of fungi in the Cryphonectriaceae. The aims of the study were to identify the fungus associated with the disease and to test its pathogenicity. Morphological characteristics of both sexual and asexual structures and phylogenetic analyses based on partial sequences of the conserved nuclear large subunit (LSU) ribosomal DNA, the internal transcribed spacer (ITS) regions including the 5.8S gene of the ribosomal DNA operon, and two β-tubulin (BT1/BT2) regions were used for identification purposes. Phylogenetic analyses of the sequence data and morphological characteristics supported the establishment of a new genus in the Cryphonectriaceae, for which the name Xanthoporthe myrticola gen. et sp. nov. is provided. Pathogenicity trials showed that isolates were pathogenic on tested Eucalyptus grandis and hybrids as well as Corymbia henryi. The results suggest that this is an emerging pathogen that could influence the sustainability of plantation forestry in South Africa.

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导致南非种植园桉树茎干溃疡病的 Cryphonectriaceae 新属和新种

Cryphonectriaceae 真菌是 Melastomataceae 和 Myrtaceae（桃金娘科）木本灌木和树木的重要腐烂病病原体。2021 年在夸祖鲁-纳塔尔（南非）种植园进行病害调查时，在桉树和堇菜树种上发现了一种严重的茎腐病。茎腐病的表面具有典型的 Cryphonectriaceae 真菌的结构。研究的目的是确定与该病有关的真菌并测试其致病性。研究人员利用有性和无性结构的形态学特征，以及基于核大亚基（LSU）核糖体 DNA、内部转录间隔区（ITS）（包括核糖体 DNA 操作子的 5.8S 基因）和两个 β-管蛋白（BT1/BT2）区域的部分序列的系统发生学分析，来进行鉴定。序列数据和形态特征的系统发育分析支持在 Cryphonectriaceae 中建立一个新属，并将其命名为 Xanthoporthe myrticola gen.致病性试验表明，分离物对测试的大叶桉和杂交种以及鸡冠花具有致病性。结果表明，这是一种新出现的病原体，可能会影响南非人工林的可持续性。

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来源期刊

Plant Pathology 生物-农艺学

CiteScore

5.60

自引率

7.40%

发文量

147

审稿时长

3 months

期刊介绍： This international journal, owned and edited by the British Society for Plant Pathology, covers all aspects of plant pathology and reaches subscribers in 80 countries. Top quality original research papers and critical reviews from around the world cover: diseases of temperate and tropical plants caused by fungi, bacteria, viruses, phytoplasmas and nematodes; physiological, biochemical, molecular, ecological, genetic and economic aspects of plant pathology; disease epidemiology and modelling; disease appraisal and crop loss assessment; and plant disease control and disease-related crop management.