Department of Biological Sciences, Universidad de los Andes, Bogotá, Colombia.
School of Integrative Plant Science, Cornell University, Ithaca, NY, U.S.A.
Plant Dis. 2020 Apr;104(4):1113-1117. doi: 10.1094/PDIS-02-19-0307-RE. Epub 2020 Feb 10.
Host-pathogen interactions of a new species of , causal agent of late blight of tree tomato ( Cav.), identified as , were investigated with four different cultivars. Thirty-six isolates, collected from southern Colombia between 2008 and 2009, were used to inoculate common tree tomato cultivars, Común, Híbrido, Injerto, and Holandés. Data on incubation and latent periods as well as infection efficiency, lesion development, and total sporulation were collected via detached leaf assays. Significant differences in susceptibility, based on the parameters measured, were observed. Común was the most susceptible cultivar, followed by Injerto, Híbrido, and Holandés. The mean incubation period was lowest for Común at 125.6 h post-inoculation (hpi) and highest for Híbrido at 139.4 hpi. No significant differences in latent period were observed. All 36 isolates produced necrotic lesions on Común, and 33, 24, and 21 caused infection on Injerto, Híbrido, and Holandés, respectively. Two isolates were able to cause infection only on Común, and 13 isolates were able to infect all four cultivars. Infection efficiency was significantly higher for the cultivar Común, followed by Injerto, Híbrido, and Holandés. Average lesion size was larger on Común than on any other cultivar. An inverse relationship of lesion size and total sporulation was observed. Común had significantly lower total sporulation than Híbrido and Holandés, which had the smallest average lesion sizes. These data show variation in pathogenicity of isolates, under controlled conditions, and differential susceptibility of four distinct cultivars.
新种的与树番茄晚疫病相关的病原菌（）的宿主-病原体相互作用，用四种不同的品种进行了研究。2008 年至 2009 年期间从哥伦比亚南部采集了 36 个分离株，用于接种普通树番茄品种 Común、Híbrido、Injerto 和 Holandés。通过离体叶片测定收集了潜伏期和潜伏后期以及侵染效率、病斑发育和总孢子形成的数据。基于所测参数，观察到不同品种的敏感性存在显著差异。Común 是最敏感的品种，其次是 Injerto、Híbrido 和 Holandés。Común 的平均潜伏期最短，为 125.6 hpi，而 Híbrido 的潜伏期最长，为 139.4 hpi。潜伏期无显著差异。所有 36 个分离株在 Común 上均产生坏死病斑，33、24 和 21 个分离株分别在 Injerto、Híbrido 和 Holandés 上引起感染。有两个分离株只能引起 Común 感染，有 13 个分离株能感染所有四个品种。Común 品种的侵染效率显著更高，其次是 Injerto、Híbrido 和 Holandés。平均病斑大小在 Común 上大于任何其他品种。病斑大小与总孢子形成呈反比关系。Común 的总孢子形成量明显低于 Híbrido 和 Holandés，这两个品种的平均病斑最小。这些数据表明，在受控条件下，不同的 分离株具有致病性的变化，以及四个不同 品种的敏感性存在差异。
