In vitro variation in pathogenicity of Fusarium species causing head blight in relation to their isolation from barley head

N. Sakr
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引用次数: 2

Abstract

Till now, no published study is available on the variation in pathogenicity of Fusarium head blight (FHB) pathogens in relation to their isolation origin in barley head. To end this, two barley cultivars of contrasting quantitative resistance were artificially infected by four FHB species under field conditions over two consecutive growing seasons. Then, pathogenicity tests were conducted under in vitro conditions on single-spore cultures originated from both kernels and glumes in the heads. Different pathogenicity was detected among Fusarium species originated from both kernels and glumes, indicating that the same isolate from glumes and kernels differs in pathogenicity on leaves/seedlings. Isolates of Fusarium culmorum and Fusarium verticillioides originated from infected kernels had shorter latent periods and higher area under disease progress curves compared to isolates originated from glumes, and the reverse was observed for the Fusarium equiseti isolate. In the case of Fusarium solani, isolates originated from kernels or from glumes were equally pathogenic. Primarily findings in this first in-depth study have implications for breeding programs relied principally on actual quantification of pathogenicity in Fusarium species present in a given environment. The sampling of fungi should take into account the presence of Fusarium species of interest on kernels or glumes.
大麦头枯病镰刀菌离体致病性变异与分离的关系
到目前为止,还没有发表关于镰刀菌(FHB)病原体在大麦头部的致病性与其分离来源的变化的研究。为此,在连续两个生长季节的田间条件下,用四种FHB人工感染两个数量抗性相反的大麦品种。然后,在体外条件下对来自谷粒和颖壳的单孢子培养物进行致病性测试。在来自谷粒和颖片的镰刀菌中检测到不同的致病性,表明来自颖片和谷粒的同一分离株对叶片/幼苗的致病性不同。与来自颖片的分离株相比,来自感染谷粒的镰刀菌和轮叶镰刀菌的分离株具有更短的潜伏期和更高的疾病进展曲线下面积,而马齿镰刀菌分离株则相反。在镰刀菌的情况下,源自谷粒或颖片的分离株同样具有致病性。这项首次深入研究的主要发现对育种计划有启示,育种计划主要依赖于特定环境中镰刀菌属物种致病性的实际量化。真菌的取样应考虑到谷粒或颖片上存在感兴趣的镰刀菌物种。
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来源期刊
Acta Phytopathologica Et Entomologica Hungarica
Acta Phytopathologica Et Entomologica Hungarica Agricultural and Biological Sciences-Plant Science
CiteScore
1.10
自引率
0.00%
发文量
7
期刊介绍: The journal publishes papers on the infectious diseases of plants, damages caused by insects and deals with the basic aspects of chemical and biological protection. Within its field of interest additional topics such as resistance against plant diseases, and physiological, biochemical and molecular questions of plant resistance and susceptibility are also discussed. Publishes book reviews and advertisements.
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