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首页> 外文期刊>Plant Disease >First report of the A2 mating type of Phytophthora capsici infecting peppers (Capsicum annuum) in Taiwan.
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First report of the A2 mating type of Phytophthora capsici infecting peppers (Capsicum annuum) in Taiwan.

机译：台湾首次感染辣椒的疫霉辣椒的A2交配类型。

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摘要

P. capsici was first identified on pepper (C. annuum) in Taiwan in 1976. At that time, only the A1 mating type was present. In 2007, the A2 mating type of P. capsici was identified on tomato and aubergine in the central part of the country. During an excessively rainy period in mid-2008, many chilli and sweet pepper fields in Taiwan suffered severe losses due to P. capsici. Symptoms included a foliar blight and stem, root and fruit rot. Plants eventually wilted and died. Symptomatic plants were collected from chilli and sweet pepper production areas in central, southern and eastern Taiwan. Fifty-three isolates from single zoospores were identified by PCR using species-specific primers CAPFW/CAPRV2. The mating type was determined by co-inoculating rapeseed agar plates with mycelial plugs of the tester and a known isolate. Pc134, maintained by the mycology unit at The World Vegetable Centre, and 27220, provided by P. J. Ann at the Taiwan Agricultural Research Institute, were used as reference isolates of A1 and A2 mating types, respectively. Plates were examined microscopically for oospores after 5-7 days of incubation at 24 degrees C in the dark. Of the 53 isolates, 15 were identified as A1. The A2 mating type was found in the central and southern regions while the A1 mating type was widely distributed across all 3 regions. In general, the A2 mating type produced loger sporangia and only a few isolates produced chlamydospores in V8 broth and on agar. This is thought to be the first report of the A2 mating type of P. capsici infecting peppers in Taiwan. The presence of both mating types in the same field has been observed.
机译：P capsici 最早是在1976年在台湾的辣椒（ C。annuum ）上发现的。当时，仅存在A1交配类型。在2007年， P的A2交配类型。在该国中部发现了辣椒和茄子上的辣椒。在2008年中期的多雨时期，台湾的许多辣椒和甜椒田因 P而遭受了严重损失。 capsici 。症状包括叶枯病和茎，根和果实腐烂。植物最终枯萎并死亡。从台湾中部，南部和东部的辣椒和甜椒生产地区收集有症状的植物。使用物种特异性引物CAPFW / CAPRV2通过PCR鉴定了来自单个游动孢子的53种分离物。通过将菜籽琼脂平板与测试仪的菌丝体塞和已知分离株共同接种来确定交配类型。由世界蔬菜中心真菌科维护的Pc134和由台湾农业研究所的P. J. Ann提供的27220分别用作A1和A2交配类型的参考菌株。在黑暗中于24°C孵育5-7天后，用显微镜检查平板的卵孢子。在53株菌株中，有15株被鉴定为A1。在中部和南部地区发现了A2交配类型，而在所有3个地区中广泛分布了A1交配类型。通常，A2交配型产生对数孢子囊孢子，只有少数分离株在V8肉汤和琼脂上产生衣原体孢子。认为这是 P的A2交配类型的第一个报告。台湾的辣椒感染辣椒。已经观察到在同一领域中两种交配类型的存在。

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