Pathogenicity of Phoma betae isolates from red beet (Beta vulgaris) at seed farms in Canterbury, New Zealand

Q3 Agricultural and Biological Sciences

New Zealand Plant Protection Pub Date : 2019-07-26 DOI:10.30843/NZPP.2019.72.272

N. Chand, E. E. Jones, S. Casonato

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引用次数: 2

Abstract

Phoma betae is an economically important pathogen of red beet causing preemergence seedling damping, leaf spot and root rot. However, the pathogenicity of P. betae is unknown in New Zealand despite the economic importance of this pathogen. Twenty-five isolates were collected from a survey of red beet seed farms in Canterbury, New Zealand during 2016/2017 and three of these PB101 (from seeds), PB103 (from roots) and PB106 (from leaves) were used for pathogenicity testing of two red-beet cultivars. Isolate PB106 was further used to investigate its effects on spinach and fodder beet as well as red beet under greenhouse conditions. All three P. betae isolates were pathogenic on both red-beet cultivars tested, causing leaf-spot symptoms. Isolates PB101 and PB106 produced significantly larger leaf-spot lesions (P<0.001) compared with PB103. Phoma betae isolate PB106 was pathogenic to both red-beet cultivars, spinach and fodder beet but fodder beet was less susceptible than the other species tested. Regardless of cultivar, P. betae is an important pathogen of beets and is capable of causing leaf spots.

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新西兰坎特伯雷种子场红甜菜(Beta vulgaris)中甜菜瘤菌株的致病性

betae是红甜菜的一种重要的经济病原体，可引起出苗前萎蔫、叶斑病和根腐病。然而，尽管betae在新西兰具有重要的经济意义，但其致病性尚不清楚。在2016/2017年期间，从新西兰坎特伯雷的红甜菜种子农场收集了25株分离株，并将其中3株PB101(来自种子)、PB103(来自根)和PB106(来自叶)用于2个红甜菜品种的致病性检测。利用分离物PB106在温室条件下进一步研究了其对菠菜、饲料甜菜和红甜菜的影响。三株甜菜卟啉卟啉菌株对两种红甜菜品种均具有致病性，引起叶斑病症状。与PB103相比，分离株PB101和PB106产生了更大的叶斑病变(P<0.001)。甜菜Phoma betae分离物PB106对红甜菜品种、菠菜和饲料用甜菜均有致病性，但饲料用甜菜的致病性较弱。无论哪个品种，甜菜单胞菌都是甜菜的重要病原菌，能够引起叶斑病。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

New Zealand Plant Protection Agricultural and Biological Sciences-Insect Science

CiteScore

1.10

自引率

0.00%

发文量

期刊介绍： New Zealand Plant Protection is the journal of the New Zealand Plant Protection Society. It publishes original research papers on all aspects of biology, ecology and control of weeds, vertebrate and invertebrate pests, and pathogens and beneficial micro-organisms in agriculture, horticulture, forestry and natural ecosystems of relevance to New Zealand.