期刊
JOURNAL OF THE ROYAL SOCIETY INTERFACE
卷 16, 期 155, 页码 -出版社
ROYAL SOC
DOI: 10.1098/rsif.2019.0243
关键词
wheat leaf; superhydrophobic; jumping-droplet condensation; spores; liberation; dispersal
资金
- USDA National Institute of Food and Agriculture [2018-67013-28063]
We show that condensation growing on wheat leaves infected with the leaf rust fungus, Puccinia triticina, is capable of spontaneously launching urediniospores off the plant. This surprising liberation mechanism is enabled by the superhydrophobicity of wheat leaves, which promotes a jumping-droplet mode of condensation powered by the surface energy released from coalescence events. We found that urediniospores often adhere to the self-propelled condensate, resulting in liberation rates of approximately 10 cm(-2) h(-1) for leaves infected with rust. Urediniospores were catapulted up to 5 mm from the leaf's surface, a distance sufficient to clear the laminar boundary layer for subsequent dispersal even in gentle winds.
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