Population dynamics of Rhizoctonia , Oculimacula , and Microdochium species in soil, roots, and stems of English wheat crops
Population dynamics of Rhizoctonia , Oculimacula , and Microdochium species in soil, roots, and stems of English wheat crops
复制标题
英国小麦作物土壤、根部和茎中丝核菌、眼斑菌和微纹菌属的种群动态
DOI：
10.1111/ppa.13329
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发表时间：
2020
期刊：
影响因子：
2.7
通讯作者：
Brown M
中科院分区：
文献类型：
--
作者：
Brown M
本研究旨在阐明引起谷物纹枯病、纹枯病和褐腐病的丝核菌、眼斑病菌和微小菌种的种群动态。在两个季节对102个英国麦田的土壤、根和茎部分中的病原菌DNA和病害的表达进行了量化。收集了每个地点的天气数据，以确定与评估的疾病相关的模式。土壤中检出最多的是纹枯病菌(66%)和立枯丝核菌2-1(63%)，其次是禾谷杆菌(54%)和小球藻(54%)。(33%)。(89%)和(56%)在根和土壤中占优势，但与根腐病症状无关，这表明这些物种以土壤和根为生存和接种源。在GS 21-30以下，Nivalis比M.Majuson茎更多地被检测到，并在尖叶野生稻的植株样品上共存。在GS 37-45，黄瓜根霉的DNA浓度高于尖叶野生稻。在GS 37-45的底部5 cm处，禾本科植物占主导地位，超过茎伸长的底部15 cm以上。由微囊藻引起的褐腐病。秋季/冬季凉爽潮湿，在英国小麦中占主导地位。由Oculimaculaspp计算的眼斑和锐眼斑病指数。和禾谷类分别与春季和夏季的湿/湿相关。结果表明，茎基病原菌总体上是共存的，但其在时间和空间上的丰度受有利的天气形势和寄主发育的影响，在茎伸长后出现生态位分化。
This study aimed to elucidate the population dynamics ofRhizoctonia,Oculimacula, andMicrodochiumspecies, causing the stem base disease complex of sharp eyespot, eyespot, and brown foot rot in cereals. Pathogen DNA in soil, roots, and stem fractions, and disease expression were quantified in 102 English wheat fields in two seasons. Weather data for each site was collected to determine patterns that correlate with assessed diseases.Oculimaculaspp. (66%) andR.solaniAG 2‐1 (63%) were most frequently detected in soil, followed byR.cerealis(54%) andMicrodochiumspp. (33%).Oculimaculaspp. (89%) andR.cerealis(56%) predominated on roots and soil but were not associated with root rot symptoms, suggesting that these species used soil and roots for survival and as inoculum source.M.nivalewas more frequently detected thanM.majuson stems up to GS 21–30 and co‐occurred on plant samples withO.acuformis.O.yallundaehad higher DNA concentration thanO.acuformisat the lower 5 cm basal region at GS 37–45.R.cerealispredominated in the upper 15 cm above the base beyond stem extension. Brown foot rot byMicrodochiumspp. was favoured by cool and wet autumns/winters and dominated in English wheat. Eyespot and sharp eyespot disease index byOculimaculaspp. andR.cerealis, respectively, correlated with wet/humid springs and summers. Results suggested that stem base pathogens generally coexisted; however, their abundance in time and space was influenced by favourable weather patterns and host development, with niche differentiation after stem extension.