Survival of Phytophthora cinnamomi as oospores, stromata, and thick-walled chlamydospores in roots of symptomatic and asymptomatic annual and herbaceous perennial plant species
Survival of Phytophthora cinnamomi as oospores, stromata, and thick-walled chlamydospores in roots of symptomatic and asymptomatic annual and herbaceous perennial plant species
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DOI：
10.1016/j.funbio.2012.12.004
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发表时间：
2013-02-01
期刊：
影响因子：
2.5
通讯作者：
Hardy, Giles E. St J.
中科院分区：
文献类型：
--
作者：
Crone, Michael;McComb, Jen A.;Hardy, Giles E. St J.
进行了研究，以确定如何在炎热和干燥的地中海夏季在有限的幸存易感主机的地区，肉桂疫霉生存。从冬季到春季，每周从边缘尤加利（jarrah）森林的自然侵扰地点收集两种西澳大利亚多年生草本植物Chamaescilla corymbosa和Stylidium diuroides以及一种西澳大利亚一年生Trachymene pilosa，2011/2012年夏季采集频率较低。在每个种中均观察到了肉桂疫霉的自体卵孢子、厚壁厚垣孢子和子座。卵孢子和厚壁厚垣孢子在植物中萌发，证实了它们的生存能力。这是首次报道肉桂疫霉在自然感染植物中的自花受精现象。首次报道了肉桂疫霉的子座，其在寄主细胞内密集聚集，并在植物体内萌发，具有多个芽管，菌丝能够产生卵孢子和厚垣孢子。Trachymene pilosa完全无症状，S。diuroides没有发生根病变，但一些植物枯萎，而C。伞房花序在地上仍无症状，但在一些块茎上出现病变。吸器的存在表明，P. cinnamomi在某些宿主中以生物营养方式生长。在一些一年生和多年生草本植物中，P. cinnamomi的无症状生物营养生长和一系列生存结构的产生对夏季病原体的持续存在及其管理具有影响。(C)2013年英国真菌学会。由爱思唯尔有限公司出版。保留所有权利。
Studies were conducted to determine how Phytophthora cinnamomi survives during hot and dry Mediterranean summers in areas with limited surviving susceptible hosts. Two Western Australian herbaceous perennials Chamaescilla corymbosa and Stylidium diuroides and one Western Australian annual Trachymene pilosa were collected weekly from a naturally infested site from the Eucalyptus marginata (jarrah) forest from winter to spring and less frequently during summer 2011/2012. Selfed oospores, thick-walled chlamydospores, and stromata of P. cinnamomi were observed in each species. Oospores and thick-walled chlamydospores germinated in planta confirming their viability. This is the first report of autogamy by P. cinnamomi in naturally infected plants. Stromata, reported for the first time for P. cinnamomi, were densely aggregated inside host cells, and germinated in planta with multiple germ tubes with hyphae capable of producing oospores and chlamydospores. Trachymene pilosa was completely asymptomatic, S. diuroides did not develop root lesions but some plants wilted, whilst C. corymbosa remained asymptomatic above ground but lesions developed on some tubers. The presence of haustoria suggests that P. cinnamomi grows biotrophically in some hosts. Asymptomatic, biotrophic growth of P. cinnamomi in some annual and herbaceous perennials and the production of a range of survival structures have implications for pathogen persistence over summer and its management. (C) 2013 The British Mycological Society. Published by Elsevier Ltd. All rights reserved.