Complex Forest Tree Diseases – Diagnostics Beyond Koch’s Postulates

IF 9 1区 农林科学 Q1 FORESTRY
Pierluigi (Enrico) Bonello
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Abstract

Purpose of Review

Forest tree diseases are a major contributor to forest degradation and loss of productivity. They are often quite complex in their causation (etiology), especially in the case of forest syndromes, i.e. diseases with multiple causes and concurrent symptoms. Traditionally, to prove pathogenicity of a microbial agent, and thus correctly diagnose the etiology of a disease, plant pathologists must satisfy all of the so-called Koch’s postulates, as mandated by their deontological code. This review examines whether this approach is still current.

Recent Findings

Koch’s postulates state that a pathogen is a microorganism that, after being isolated in pure culture, can reproduce the disease when it is inoculated into a healthy plant. Over the decades, plant pathologists as well as medical scientists have discovered that these postulates are not always applicable in their entirety and that, furthermore, novel approaches based on molecular biology can be very helpful in uncovering relationships between microbes and diseases that are not easily proven using Koch’s postulates.

Summary

I conclude that Koch’s postulates are not a viable approach for many forest tree diseases and propose a set of new guidelines, based on the preponderance of the evidence principle, to integrate this proven approach and bring it into the twenty-first century.

Abstract Image

复杂的林木疾病--超越科赫定理的诊断方法
综述目的林木疾病是造成森林退化和生产力损失的主要因素。林木病害的成因(病因学)往往相当复杂,尤其是森林综合症,即具有多种病因和并发症状的病害。传统上,要证明微生物病原体的致病性,从而正确诊断疾病的病因,植物病理学家必须满足所谓的 "科赫假设"(Koch's postulates),这也是他们的道德准则所规定的。最新研究结果科赫假说指出,病原体是一种微生物,在纯培养物中分离出来后,接种到健康植物中就能繁殖病害。几十年来,植物病理学家和医学家发现,这些假设并不总是完全适用的,此外,基于分子生物学的新方法可以很好地帮助揭示微生物与疾病之间的关系,而这些关系使用科赫假设并不容易证明。摘要我的结论是,科赫假设对于许多林木疾病来说并不是一种可行的方法,并根据证据优势原则提出了一套新的指导原则,以整合这种行之有效的方法并将其带入 21 世纪。
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来源期刊
Current Forestry Reports
Current Forestry Reports Agricultural and Biological Sciences-Ecology, Evolution, Behavior and Systematics
CiteScore
15.90
自引率
2.10%
发文量
22
期刊介绍: Current Forestry Reports features in-depth review articles written by global experts on significant advancements in forestry. Its goal is to provide clear, insightful, and balanced contributions that highlight and summarize important topics for forestry researchers and managers. To achieve this, the journal appoints international authorities as Section Editors in various key subject areas like physiological processes, tree genetics, forest management, remote sensing, and wood structure and function. These Section Editors select topics for which leading experts contribute comprehensive review articles that focus on new developments and recently published papers of great importance. Moreover, an international Editorial Board evaluates the yearly table of contents, suggests articles of special interest to their specific country or region, and ensures that the topics are up-to-date and include emerging research.
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