Pathogenicity of Ceratocystis fimbriata from New Zealand kūmara on kiwifruit cultivars

Q3 Agricultural and Biological Sciences

New Zealand Plant Protection Pub Date : 2020-01-01 DOI:10.30843/nzpp.2020.73.11717

J. Tyson, M. Manning, P. Wright

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引用次数: 1

Abstract

Ceratocystis fimbriata was reported in 2010 causing wilt and death of kiwifruit (Actinidia spp.) vines in Brazil, with losses of up to 50% of vines on some orchards. New Zealand is one of the largest producers of kiwifruit in the world, but C. fimbriata has been recorded only on kūmara (Ipomoea batatas) in this country. In this study the pathogenicity of New Zealand isolates of C. fimbriata from kūmara was examined using potted vines of four kiwifruit cultivars. During the trial, none of the vines became visibly diseased, growth rates were not restricted, and discolouration at the inoculation sites on the stem was minimal. In comparison, tests by researchers in Brazil using C. fimbriata isolated from symptomatic kiwifruit resulted in lengthy lesions and death of susceptible kiwifruit seedlings. Sequences of the internal transcribed spacer (ITS) region of rRNA from the New Zealand C. fimbriata isolates were 100% identical to those sequences from C. fimbriata isolates from Ipomoea batatas in GenBank. This study has shown that the New Zealand isolates of C. fimbriata from kūmara are not pathogenic to the kiwifruit cultivars tested, and are a different pathotype to those found on kiwifruit in Brazil.

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新西兰丝状角鼻虫kūmara对猕猴桃品种的致病性

据报道，2010年在巴西，丝状角鼻虫(Ceratocystis fibriata)导致猕猴桃(Actinidia spp.)葡萄藤枯萎和死亡，一些果园的葡萄藤损失高达50%。新西兰是世界上最大的猕猴桃生产国之一，但C. fibriata只在这个国家的kūmara (Ipomoea batatas)上有记录。本文利用4个猕猴桃品种的盆栽藤蔓，对kūmara中新西兰分离株的致病性进行了研究。在试验期间，没有一株葡萄藤明显患病，生长速度没有受到限制，茎上接种部位的变色很小。相比之下，巴西的研究人员使用从有症状的猕猴桃中分离出的C. fibriata进行的试验导致了猕猴桃幼苗的长期损伤和死亡。新西兰C. fimbriata分离株的rRNA内部转录间隔区(ITS)序列与GenBank中来自Ipomoea batata的C. fimbriata分离株的序列完全相同。这项研究表明，来自kūmara的新西兰分离株对所测试的猕猴桃品种没有致病性，并且与在巴西猕猴桃上发现的致病性不同。

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.