Characterization of Pyrenophora tritici-repentis (tan spot of wheat) races in Kazakhstan

IF 1.9 3区农林科学 Q2 AGRONOMY Phytopathologia Mediterranea Pub Date : 2022-07-19 DOI:10.36253/phyto-13178

M. Kumarbayeva, A. Kokhmetova, N. Kovalenko, M. Atishova, Zh.S. Keishilov, Klara Aitymbetova

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引用次数: 1

Abstract

Tan spot, caused by Pyrenophora tritici-repentis, is an economically important foliar disease of wheat in Kazakhstan. Population structure of the pathogen changes every year due to climate change. This study aimed to characterize the race structure of P. tritici-repentis isolates recovered from wheat in south and north Kazakhstan, and identify tan spot resistance in host genotypes based on disease phenotypes and molecular screening. Virulence profiles were determined within 40 isolates of the pathogen from wheat crops during the 2020 growing season. Seven races, (1, 3, 4, 5, 6, 7 and 8) were identified. A collection of 80 wheat accessions, including promising lines and cultivars from Kazakhstan and Russia, were evaluated for their reactions to races 1 and 5 of the pathogen, and to Ptr ToxA and Ptr ToxB, using greenhouse assessments and molecular markers diagnostic for the Tsn1 and Tsc2 genes. From a practical viewpoint, 18 wheat genotypes were insensitive to the two races and the two Ptr toxins. This resistant germplasm can be used in breeding programmes aiming to develop wheat varieties resistant to P. tritici-repentis.

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哈萨克斯坦小麦褐斑病小种的特征

小麦褐斑病是哈萨克斯坦小麦叶面重要的经济病害，由小麦褐斑菌引起。由于气候的变化，病原菌的种群结构每年都在变化。本研究旨在对从哈萨克斯坦南部和北部小麦中分离得到的小麦小麦黑斑病抗性品系进行结构鉴定，并基于疾病表型和分子筛选鉴定宿主基因型的黑斑病抗性。在2020年生长季节，对小麦作物中40株病原菌进行了毒力分析。共有7个马，分别是1、3、4、5、6、7和8。采用温室评估和Tsn1和Tsc2基因的分子标记诊断方法，对80份小麦材料(包括哈萨克斯坦和俄罗斯的有前途的品系和品种)对病原菌1和5小种以及Ptr ToxA和Ptr ToxB的反应进行了评价。从实用角度看，18个小麦基因型对这两个小种和两种Ptr毒素不敏感。这种抗性种质可用于培育抗小麦小偃麦草病的小麦品种。

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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.