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狄普洛迪亚尖虫病原体的毒性通过宿主开关来增强.
Kathrin Blumenstein1,2, Johanna Bußkamp3, Gitta Jutta Langer3
1Forest Pathology Research Group, Department of Forest Botany and Tree Physiology, Faculty of Forest Sciences and Forest Ecology, Georg-August-University Göttingen, Göttingen, Germany.
干旱压力有利于在苏格兰松树林中的真菌病原体Diplodia sapinea. 来自非松树宿主的菌株造成了最大的损害,表明气候变化将增加树木死亡率.
科学领域:
- 森林病理学 森林病理学
- 植物病原体相互作用
- 气候变化对生态系统的影响
背景情况:
- 森林健康受到日益严重的干旱和新出现的病原体的威胁.
- 滴滴 (Sphaeropsis sapinea) 是苏格兰松树 (Pinus sylvestris) 的重要病原体,导致滴滴.
- D. sapinea 在非针叶树宿主身上被发现,这表明宿主范围更广.
研究的目的:
- 为了比较水供应对不同宿主 (内生菌,病原体,非松树宿主) 的D. sapinea菌株所引起的亡长度的影响.
- 评估D. sapinea在干旱压力下的苏格兰松树中的作用和潜在的宿主切换场景.
主要方法:
- 从无症状和症状的苏格兰松树和症状的非松树宿主中分离D. sapinea菌株.
- 在不同的水供应条件下用D. sapinea菌株注射苏格兰松树.
- 测量亡长度以量化疾病严重程度.
主要成果:
- 在所有测试的D. sapinea菌株中,减少水的可用性显著增加了苏格兰松树的亡长度.
- 来自非松树宿主的分离物始终在所有可用水位上引起最严重的亡.
- 经过宿主切换的菌株在苏格兰松中诱导了较高的死亡率.
结论:
- 气候变化,特别是干旱,可能会加剧D. sapinea的损害,并增加苏格兰松树林的死亡率.
- 非松树宿主衍生菌株的毒性增加对苏格兰松树构成重大威胁,增加了来自新来源的感染压力.
- 未来的森林管理战略必须考虑D. sapinea的适应潜力及其在不断变化的环境条件下的影响.
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