Oerke Erich-Christian, Steiner Ulrike
Institute of Crop Science and Resource Conservation-Plant Pathology, Rheinische Friedrich-Wilhelms-Universitaet Bonn, 53113 Bonn, Germany.
J Fungi (Basel). 2025 Mar 9;11(3):211. doi: 10.3390/jof11030211.
The length of incubation period, i.e., the time between first contact of host and pathogen and the appearance of symptoms, varies among diseases and depends on environmental conditions. is the most important fungal pathogen in sugar beet production worldwide, as Cercospora leaf spot (CLS) reduces the leaf area contributing to yield formation. Using sugar beet cultivars differing in CLS resistance, a single infection period of resulted in minor differences in the incubation period among host genotypes and among individual plants of cultivars, greater differences among leaves within plants, and substantial variation within individual leaves. Under greenhouse conditions not suitable for secondary infections, the first CLS lesions appeared 10 days after inoculation; however, the number of leaf spots and CLS severity further increased significantly for another 7 to 17 days. A geographic information system approach enabled the tracking of colony appearance and growth of all CLSs on inoculated leaves for up to 27 days. Asymptomatic colonization of leaves was associated with thick hyphae which switched to thin hyphae or melanization after lesion appearance. The lifestyle of -intercellular tissue colonization, triggering of necrotic host reaction-is discussed considering the experimental results as well as literature resources.
潜伏期的长度，即宿主首次接触病原体与症状出现之间的时间，因疾病而异，并取决于环境条件。在全球甜菜生产中， 是最重要的真菌病原体，因为尾孢叶斑病（CLS）会减少对产量形成有贡献的叶面积。使用对CLS抗性不同的甜菜品种，单一感染期导致宿主基因型之间以及品种内单株之间的潜伏期差异较小，植株内叶片之间差异较大，单叶内差异显著。在不适合二次感染的温室条件下，接种后10天出现首个CLS病斑；然而，叶斑数量和CLS严重程度在接下来的7至17天内进一步显著增加。一种地理信息系统方法能够追踪接种叶片上所有CLS菌落的出现和生长情况，长达27天。叶片的无症状定殖与粗壮菌丝有关，病斑出现后粗壮菌丝会转变为纤细菌丝或黑化。结合实验结果和文献资源，讨论了细胞间组织定殖、引发宿主坏死反应的生活方式。
