Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, DK-1871 Frederiksberg C, Denmark.
Knud Jepsen a/s, Skanderborgvej 193, 8382 Hinnerup, Denmark.
Plant Dis. 2019 Oct;103(10):2634-2644. doi: 10.1094/PDIS-12-18-2252-RE. Epub 2019 Jul 24.
Greenhouse cultivation of ornamentals is subjected to a high incidence of soil-borne fungal pathogens. In Kalanchoe, these pathogens are responsible for root and stem rot, and for infection of the vascular tissue. Well-known soil-borne pathogens are believed to cause these diseases. Yet, a systematized survey of these pathogens is lacking for Kalanchoe produced commercially. Here, we studied the occurrence of soil-borne fungal pathogens associated with cultivation of Kalanchoe in Denmark and production of cuttings and stock plants in greenhouse facilities located in Turkey and Vietnam. Molecular identification of pathogens complemented mycological identification and pathogenicity testing of the soil-borne fungal pathogens. This study revealed that the fungi , , , and are the most prevalent pathogens associated with root and stem rotting and wilt of Kalanchoe under the conditions studied. Furthermore, the study showed that some of the pathogens are part of an infection complex comprising both primary and opportunistic fungal species. The fact that some of the pathogens were present in some regions, while absent in others, suggests how they move between greenhouse facilities on infected plant material. This study generated important information about the soil-borne fungal complex affecting Kalanchoe, which is useful for a better understanding of the biology of the disease and for designing control strategies.
温室栽培的观赏植物易受到土传真菌病原体的侵袭。在长寿花中，这些病原体可导致根腐病和茎腐病，并感染维管束组织。人们认为，一些常见的土传病原体可导致这些疾病。然而，目前缺乏针对商业生产的长寿花的这些病原体的系统调查。在这里，我们研究了与丹麦温室栽培长寿花和在土耳其和越南温室设施中生产插条和母本植物相关的土传真菌病原体的发生情况。通过分子鉴定补充了对土传真菌病原体的真菌学鉴定和致病性测试。本研究表明，在所研究的条件下， 、 、 和 是与长寿花根腐病和枯萎病相关的最普遍的病原体。此外，该研究表明，一些病原体是包含原发性和机会性真菌物种的感染复合体的一部分。一些病原体在某些地区存在而在其他地区不存在的事实表明了它们如何在受感染的植物材料之间在温室设施之间移动。本研究为影响长寿花的土传真菌复合体提供了重要信息，这有助于更好地了解疾病的生物学特性，并设计控制策略。
