Fig rust caused by Phakopsora nishidana in South Africa

IF 1.9 3区农林科学 Q2 AGRONOMY

Phytopathologia Mediterranea Pub Date : 2022-07-19 DOI:10.36253/phyto-13034

W. Boshoff, B. Visser, C. Bender, A. Wood, L. Rothmann, K. Wilson, V. HAMILTON-ATTWELL, Z. Pretorius

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引用次数: 0

Abstract

Fig rust, caused by Cerotelium fici, was first recorded in South Africa in 1927. Recent observations have revealed high incidence of rust and untimely defoliation of fig trees (Ficus carica) in residential gardens and commercial orchards. Using phylogenetic analysis, the causal organism of a fig rust isolate (PREM63073) collected in 2020 was confirmed as Phakopsora nishidana. Inoculation and microscope studies showed that mulberry plants were immune to P. nishidana isolate PREM63073. Infection of fig leaves occurred through stomata on the abaxial leaf surfaces. Very long germ tubes were observed for P. nishidana, often with no clear contact with the leaf surfaces and an apparent lack of directional growth towards stomata. Inoculated plants from 15 fig cultivars varied in their severity of leaf infection, whereas fruit of the cultivar Kadota developed reddish-brown blemishes without sporulation. Currently, C. fici and P. nishidana are recognised as occurring on F. carica in South Africa. This suggests a need to resolve the worldwide distribution and identity of the rust species involved.

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由南非西田榕蝇引起的无花果锈病

无花果锈病是由Cerotellium fici引起的，1927年在南非首次被记录在案。最近的观察表明，在住宅花园和商业果园中，无花果树（Ficus carica）的锈病和过早落叶发生率很高。通过系统发育分析，2020年采集的一株无花果锈病分离株（PREM63073）的致病菌被确认为西田Phakopsora nishidana。接种和显微镜研究表明，桑树对西氏疟原虫分离株PREM63073具有免疫性。无花果叶片的感染是通过叶片背面的气孔发生的。尼希达纳的芽管很长，通常与叶片表面没有明显接触，也明显缺乏朝向气孔的定向生长。15个无花果品种的接种植物叶片感染的严重程度各不相同，而品种Kadota的果实出现了红棕色的瑕疵，没有孢子形成。目前，C.fici和P.nishidana被认为发生在南非的F.carica上。这表明需要解决所涉及的铁锈物种的全球分布和身份问题。

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来源期刊

Phytopathologia Mediterranea 生物-植物科学

CiteScore

4.40

自引率

8.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Phytopathologia Mediterranea is an international journal edited by the Mediterranean Phytopathological Union. The journal’s mission is the promotion of plant health for Mediterranean crops, climate and regions, safe food production, and the transfer of new knowledge on plant diseases and their sustainable management. The journal deals with all areas of plant pathology, including etiology, epidemiology, disease control, biochemical and physiological aspects, and utilization of molecular technologies. All types of plant pathogens are covered, including fungi, oomycetes, nematodes, protozoa, bacteria, phytoplasmas, viruses, and viroids. The journal also gives a special attention to research on mycotoxins, biological and integrated management of plant diseases, and the use of natural substances in disease and weed control. The journal focuses on pathology of Mediterranean crops grown throughout the world. The Editorial Board of Phytopathologia Mediterranea has recently been reorganised, under two Editors-in-Chief and with an increased number of editors.