Localized within- and between-tree variation in nematode distribution during latent state of pine wilt disease makes the disease status cryptic.
Localized within- and between-tree variation in nematode distribution during latent state of pine wilt disease makes the disease status cryptic.
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松材线虫病潜伏状态下树内和树间分布的局部变异使得该病的状态变得神秘。
DOI：
10.1111/efp.12244
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发表时间：
2015
期刊：
影响因子：
1.4
通讯作者：
Matsushita M
中科院分区：
文献类型：
--
作者：
Hohizaki K;Nakabayashi Y;Mamiya Y;Matsushita M
松材线虫病是一种严重危害东亚地区松树林的流行性病害。这种疾病已经蔓延到亚洲北方地区和欧洲部分地区。为了防止疾病传播作为最前沿的损害预防，更好地了解感染状况是非常重要的。并非所有受感染的树木都表现出疾病症状，这种无症状的PWN携带树木可能会被忽视，并可能成为病原体水库。为了阐明PWN感染状态无症状的树木，我们进行了PWN检查的树枝和树干在21个测试树在两种不同的条件：树木经历了PWN接种和那些怀疑PWN感染，经历了短暂的树叶变色。我们检测到PWN在8个测试树（38%）和13个（1.5%），共843个样本。这些百分比的差异表明，线虫栖息在树木内的高度本地化，可能是由于有限的迁移PWNs。我们的数据表明，曾经衰弱但恢复活力的树木可以作为无症状携带者在森林中存活。疾病控制的影响也进行了讨论。
The pinewood nematode (PWN),Bursaphelenchus xylophilus, is the causal agent of pine wilt disease, an epidemic disease that has severely damaged pine forests in East Asia. The disease has spread to northern areas in Asia and parts of Europe. To prevent disease spread as the forefront of damage prevention, a better understanding of infection status is highly important. Not all infected trees show disease symptoms, and such asymptomatic PWN‐carrying trees are likely to be overlooked and can become a pathogen reservoir. To elucidate PWN infection status in asymptomatic trees, we performed PWN inspection of branches and trunks in 21 test trees in two different conditions: trees that had experienced PWN inoculation and those with suspected PWN infection that had experienced transient foliage discoloration. We detected PWNs in eight test trees (38%) and in 13 (1.5%) of a total of 843 samples. The difference in these percentages suggests that nematode inhabitation was highly localized within the trees, possibly owing to the restricted migration of PWNs. Our data demonstrated that trees that were once weakened but recovered their vigour can persist, as the asymptomatic carriers, in the forest. The implications for disease control are also discussed.