Sebastià Pau, de Pedro-Jové Roger, Daubech Benoit, Kashyap Anurag, Coll Núria S, Valls Marc
Centre for Research in Agricultural Genomics (CSIC-IRTA-UAB-UB), Bellaterra, Spain.
Department of Genetics, University of Barcelona, Barcelona, Spain.
Front Plant Sci. 2021 Nov 10;12:755708. doi: 10.3389/fpls.2021.755708. eCollection 2021.
causes bacterial wilt, a devastating plant disease, responsible for serious losses on many crop plants. phylotype II-B1 strains have caused important outbreaks in temperate regions, where the pathogen has been identified inside asymptomatic bittersweet () plants near rivers and in potato fields. is a perennial species described as a reservoir host where can overwinter, but their interaction remains uncharacterised. In this study, we have systematically analysed infection in , dissecting the behaviour of this plant compared with susceptible hosts such as tomato cv. Marmande, for which the interaction is well described. Compared with susceptible tomatoes, plants (i) show delayed symptomatology and bacterial progression, (ii) restrict bacterial movement inside and between xylem vessels, (iii) limit bacterial root colonisation, and (iv) show constitutively higher lignification in the stem. Taken together, these results demonstrate that behaves as partially resistant to bacterial wilt, a property that is enhanced at lower temperatures. This study proves that tolerance (i.e., the capacity to reduce the negative effects of infection) is not required for a wild plant to act as a reservoir host. We propose that inherent resistance (impediment to colonisation) and a perennial habit enable bittersweet plants to behave as reservoirs for .
引发青枯病，这是一种极具破坏性的植物病害，会给许多农作物造成严重损失。II-B1 系统发育型菌株在温带地区引发了重大疫情，在那里，该病原体已在河流附近无症状的苦甜茄（）植株以及马铃薯田中被发现。苦甜茄是一种多年生植物，被描述为病原菌可以越冬的储存宿主，但它们之间的相互作用仍未得到描述。在本研究中，我们系统地分析了苦甜茄中的感染情况，剖析了这种植物与易感宿主（如番茄品种 Marmande）相比的行为，对于后者，其相互作用已有详尽描述。与易感番茄相比，苦甜茄植株（i）症状表现和细菌增殖出现延迟，（ii）限制细菌在木质部导管内部及之间的移动，（iii）限制细菌在根部的定殖，并且（iv）茎部的木质化程度持续较高。综合来看，这些结果表明苦甜茄对青枯病表现出部分抗性，这种特性在较低温度下会增强。本研究证明，野生植物作为储存宿主并不需要耐受性（即降低感染负面影响的能力）。我们提出，内在抗性（对定殖的阻碍）和多年生习性使苦甜茄植株能够成为病原菌的储存宿主。
