A new species of Bremia from the traditional crop Carthamus tinctorius from Iran

IF 2.5 3区农林科学 Q2 Agricultural and Biological Sciences Tropical Plant Pathology Pub Date : 2024-02-21 DOI:10.1007/s40858-024-00640-w

Zohreh Borjizad, Mehdi Mehrabi-Koushki, Reza Farokhinejad, Atena Safi, Man Mu, Marco Thines

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Abstract

Bremia species cause downy mildew disease of Asteraceae, in particular in the subfamilies Cichorioideae and Carduoideae. The most notorious species is B. lactucae, which causes lettuce downy mildew. Previously, it was often assumed that this species causes disease on dozens of different host genera, but recent phylogenetic and morphological studies have shown that most species of Bremia are highly host specific and that B. lactucae might be mostly limited to Lactuca sativa and L. serriola. As a first step towards investigating the diversity of Bremia in Iran, ten fresh samples of downy mildew from Carthamus tinctorius and Sonchus asper were collected in 2017 to 2018 from various regions of Ahvaz in the southwest of Iran and subjected to morphological and molecular characterisation. Phylogenetic analyses based on cox2 sequences of mtDNA indicated that these samples represent two sister species of Bremia, B. milovtzovae sp. nov. and B. sonchi, causal agents of downy mildew on C. tinctorius and S. asper, respectively. Morphologically, B. milovtzovae sp. nov. can be readily distinguished from its sister species, B. sonchi, by more elongated conidia and shorter conidiophores.

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来自伊朗传统作物胡麻（Carthamus tinctorius）的 Bremia 新种

Bremia 物种会引起菊科植物的霜霉病，尤其是 Cichorioideae 和 Carduoideae 亚科植物。最臭名昭著的物种是乳霉属（B. lactucae），它会引起莴苣霜霉病。以前，人们通常认为该物种会在数十个不同的寄主属上致病，但最近的系统发育和形态学研究表明，Bremia 的大多数物种都具有高度的寄主特异性，B. lactucae 可能主要局限于 Lactuca sativa 和 L. serriola。作为研究伊朗 Bremia 多样性的第一步，2017 年至 2018 年，研究人员从伊朗西南部的阿瓦士（Ahvaz）不同地区收集了 10 份来自胡麻（Carthamus tinctorius）和芒草（Sonchus asper）的霜霉病新鲜样本，并对其进行了形态学和分子鉴定。基于 mtDNA 的 cox2 序列的系统发育分析表明，这些样本代表了 Bremia 的两个姊妹种，即 B. milovtzovae sp. nov. 和 B. sonchi，它们分别是 C. tinctorius 和 S. asper 霜霉病的病原菌。从形态上看，B. milovtzovae sp.

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来源期刊

Tropical Plant Pathology PLANT SCIENCES-

CiteScore

4.50

自引率

4.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Tropical Plant Pathology is an international journal devoted to publishing a wide range of research on fundamental and applied aspects of plant diseases of concern to agricultural, forest and ornamental crops from tropical and subtropical environments.  Submissions must report original research that provides new insights into the etiology and epidemiology of plant disease as well as population biology of plant pathogens, host-pathogen interactions, physiological and molecular plant pathology, and strategies to promote crop protection. The journal considers for publication: original articles, short communications, reviews and letters to the editor. For more details please check the submission guidelines. Founded in 1976, the journal is the official publication of the Brazilian Phytopathology Society.