Vortex-induced dispersal of a plant pathogen by raindrop impact
Vortex-induced dispersal of a plant pathogen by raindrop impact
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DOI：
10.1073/pnas.1820318116
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发表时间：
2019-03-12
影响因子：
11.1
通讯作者：
Jung, Sunghwan
中科院分区：
文献类型：
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作者：
Kim, Seungho;Park, Hyunggon;Jung, Sunghwan
雨滴对受感染植物的影响可以分散植物病原体的微米级繁殖体（例如，真菌孢子）。关于雨滴作用下植物病原体释放和运输的机制，目前还知之甚少。我们使用高速摄影观察了数千个干燥分散的锈菌孢子，这些孢子在一滴雨滴的影响下从受感染的小麦植株中释放出来。结果表明，雨滴撞击过程中形成了一个空气涡旋环，将干分散的孢子带离寄主植物表面。在空气涡旋的作用下，孢子的最大飞行高度和最大飞行距离增加。这种独特的机制，涡诱导的分散动力学的特点是预测孢子的轨迹。最后，我们发现空气涡旋输送的孢子可以到达叶片的层流边界层之外，这将使植物病原体通过大气进行长距离输送。
Raindrop impact on infected plants can disperse micron-sized propagules of plant pathogens (e.g., spores of fungi). Little is known about the mechanism of how plant pathogens are liberated and transported due to raindrop impact. We used high-speed photography to observe thousands of dry-dispersed spores of the rust fungus Puccinia triticina being liberated from infected wheat plants following the impact of a single raindrop. We revealed that an air vortex ring was formed during the raindrop impact and carried the dry-dispersed spores away from the surface of the host plant. The maximum height and travel distance of the airborne spores increased with the aid of the air vortex. This unique mechanism of vortex-induced dispersal dynamics was characterized to predict trajectories of spores. Finally, we found that the spores transported by the air vortex can reach beyond the laminar boundary layer of leaves, which would enable the long-distance transport of plant pathogens through the atmosphere.