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首页> 外文期刊>Plant Disease >Identification, Pathogenicity, and Fungicide Sensitivity of Ascochyta caulina (Teleomorph: Neocamarosporium calvescens) Associated with Black Stem on Quinoa in China
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Identification, Pathogenicity, and Fungicide Sensitivity of Ascochyta caulina (Teleomorph: Neocamarosporium calvescens) Associated with Black Stem on Quinoa in China

机译：与中国奎奴亚藜有关的Ascochyta caulina（Teleomorph：Neocamarosporium Calvescens）的鉴定，致病性和杀菌剂敏感性

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摘要

Quinoa black stem is a new disease that affects the stems of quinoa plants and is more likely to develop under cool conditions (15 to 25 degrees C, RH = 55 +/- 2%). The typical symptoms include the formation of black necrotic lesions on the stem, which can completely wrap around the stem, causing lodging and blanking (development of 'empty' and sterile grain on the panicle). Furthermore, the pycnidia form small round protrusions on the surface of the lesions. Phylogenetic analysis revealed that representative isolates LMHS-3 and LMHS-5 were closely related to Ascochyta caulina (teleomorph: Neo-camarosporium calvescens). Comprehensive morphological and molecular characterizations confirmed A. caulina as the pathogen that caused quinoa black stem. A. caulina mainly infected quinoa stems and could produce many pycnidia, but it rarely infected quinoa leaves. Pathogenicity testing showed that the most suitable temperature for the onset of quinoa black stem was from 15 to 25 degrees C. When the temperature was increased above 30 degrees C, the conidial germination of A. caulina became malformed, and when the temperature was decreased below 5 degrees C, mycelium growth of A. caulina became extremely slow; thus, both extreme high and low temperatures affected the pathogenicity of A. caulina. Mancozeb and azoxystrobin fungicides were revealed to have had the strongest inhibitory effects on the conidial germination of A. caulina, and in some cases caused malformations in conidial germination. Tebuconazole and difenoconazole had the strongest inhibitory effects on A. caulina mycelial growth and less on the effects on the conidial germination. The results of the present study provide a basis for the recognition and management of quinoa black stem.
机译：奎奴亚藜黑茎是一种影响奎奴亚藜植物茎的新疾病，更可能在凉爽的条件下发育（15至25℃，rH = 55 +/- 2％）。典型的症状包括在茎上形成黑色坏死病变，这可以完全缠绕在茎周围，引起植物的封入和消隐（在穗上发育'空'和无菌谷物）。此外，Pycnidia在病变表面上形成小的圆形突起。系统发育分析显示，代表性分离物LMHS-3和LMHS-5与Ascochyta caulina（Teleomorph：Neo-Camarosporium Calvescens）密切相关。综合形态和分子特征证实了A.Caulina作为导致藜麦黑茎的病原体。 A. Caulina主要感染藜麦茎，可以产生许多Pycnidia，但很少受到奎奴亚藜的叶子。致病性试验表明，奎奴亚藜黑茎发作的最合适温度为15至25℃。当温度升高到30℃以上时，A.Caulina的分析萌发变得畸形，当温度下降下降时5摄氏度，A.Caulina的菌丝体生长变得极为慢;因此，极端高和低温均影响了甲板的致病性。揭示了Mancozeb和Azoxystrobin杀菌剂对A. caulina的分析萌发具有最强的抑制作用，在某些情况下引起了分析萌发的畸形。 Tebuconazole和DiyenoConazole对A.Caulina菌丝体生长的最强抑制作用和对分析萌发的影响较少。本研究的结果为藜麦黑茎的识别和管理提供了基础。

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  • 来源
    《Plant Disease》 |2020年第10期|共13页
  • 作者

    Yin Hui; Zhou Jianbo; Lv Hong; Qin Nan; Chang Fang Juan; Zhao Xiaojun;

  • 作者单位

    Shanxi Agr Univ Coll Plant Protect Taiyuan Shanxi Peoples R China;

    Shanxi Agr Univ Coll Plant Protect Taiyuan Shanxi Peoples R China;

    Shanxi Agr Univ Coll Plant Protect Taiyuan Shanxi Peoples R China;

    Shanxi Agr Univ Coll Plant Protect Taiyuan Shanxi Peoples R China;

    Shanxi Agr Univ Coll Plant Protect Taiyuan Shanxi Peoples R China;

    Shanxi Agr Univ Coll Plant Protect Taiyuan Shanxi Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 植物保护;
  • 关键词

    quinoa; fungal disease; morphology; conidia; teleomorph;

    机译：藜麦;真菌疾病;形态;Conidia;Teleomorph;

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