Suppr超能文献

玉米戈斯枯萎病及附生内布拉斯加棒杆菌的传播:来自接种点源的情况

Dissemination of Goss's Wilt of Corn and Epiphytic Clavibacter michiganensis subsp. nebraskensis from Inoculum Point Sources.

作者信息

Eggenberger Sharon, Diaz-Arias Mercedes M, Gougherty Andrew V, Nutter Forrest W, Sernett Jeff, Robertson Alison E

机构信息

Department of Plant Pathology and Microbiology, Iowa State University, Ames 50014.

Monsanto Company, St. Louis 63006.

出版信息

Plant Dis. 2016 Apr;100(4):686-695. doi: 10.1094/PDIS-04-15-0486-RE. Epub 2016 Feb 1.

Abstract

Goss's wilt of corn, caused by Clavibacter michiganensis subsp. nebraskensis, has reemerged since 2006 as an economically important disease of corn in in the Midwestern United States. In 2012 and 2013, field plot studies were conducted with a pathogenic, rifampicin-resistant C. michiganensis subsp. nebraskensis isolate and a Goss's wilt-susceptible corn hybrid to monitor epiphytic C. michiganensis subsp. nebraskensis population densities and the temporal and spatial spread of Goss's wilt incidence originating from inoculum point sources. The randomized complete block trial included three treatments: noninoculated control, inoculum point sources established by wound inoculation, and inoculum point sources consisting of C. michiganensis subsp. nebraskensis-infested corn residue. Epiphytic C. michiganensis subsp. nebraskensis was detected on asymptomatic corn leaves collected up to 2.5 m away from inoculum sources at 15 days after inoculation in both years. The percentage of asymptomatic leaf samples on which epiphytic C. michiganensis subsp. nebraskensis was detected increased until mid-August in both years, and reached 90, 55, and 35% in wound-, residue-, and noninoculated plots, respectively, in 2012; and 50, 11, and 2%, respectively, in 2013. Although both growing seasons were drier than normal, Goss's wilt incidence increased over time and space from all C. michiganensis subsp. nebraskensis point sources. Plots infested with C. michiganensis subsp. nebraskensis residue had final Goss's wilt incidence of 7.5 and 1.8% in 2012 and 2013, respectively; plots with a wound-inoculated source had final Goss's wilt incidence of 16.6 and 14.0% in 2012 and 2013, respectively. Our findings suggest that relatively recent outbreaks of Goss's wilt in new regions of the United States may be the result of a gradual, nondetected buildup of C. michiganensis subsp. nebraskensis inoculum in fields.

摘要

由内布拉斯加棒形杆菌引起的玉米戈斯枯萎病自2006年以来在美国中西部地区再度成为一种对玉米经济影响重大的病害。2012年和2013年,利用一株致病的、耐利福平的内布拉斯加棒形杆菌分离株和一个对戈斯枯萎病敏感的玉米杂交种开展田间小区试验,以监测内布拉斯加棒形杆菌的附生种群密度以及源于接种点源的戈斯枯萎病发病率的时空传播情况。随机完全区组试验包括三种处理:未接种对照、通过伤口接种建立的接种点源以及由感染内布拉斯加棒形杆菌的玉米残体组成的接种点源。在这两年接种后15天,在距接种源2.5米远的无症状玉米叶片上均检测到了附生的内布拉斯加棒形杆菌。在这两年中,检测到附生内布拉斯加棒形杆菌的无症状叶片样本的百分比一直增加到8月中旬,在2012年,伤口接种区、残体接种区和未接种区分别达到90%、55%和35%;在2013年,分别为50%、11%和2%。尽管两个生长季都比正常情况干燥,但来自所有内布拉斯加棒形杆菌点源的戈斯枯萎病发病率均随时间和空间增加。2012年和2013年,感染内布拉斯加棒形杆菌残体的小区戈斯枯萎病最终发病率分别为7.5%和1.8%;伤口接种源小区在2012年和2013年戈斯枯萎病最终发病率分别为16.6%和14.0%。我们的研究结果表明,美国新地区近期相对较新出现的戈斯枯萎病疫情可能是田间内布拉斯加棒形杆菌接种体逐渐积累且未被发现的结果。

文献AI研究员

20分钟写一篇综述,助力文献阅读效率提升50倍。

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索

文档翻译

学术文献翻译模型,支持多种主流文档格式。

立即体验