Correlation between acoustic emission, water status and xylem embolism in pine wilt disease
Correlation between acoustic emission, water status and xylem embolism in pine wilt disease
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DOI：
10.1093/treephys/27.7.969
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发表时间：
2007-07-01
期刊：
影响因子：
4
通讯作者：
Sakaue, Daisuke
中科院分区：
文献类型：
--
作者：
Fukuda, Kenji;Utsuzawa, Shin;Sakaue, Daisuke
采用声发射（AE）和高分辨率磁共振显微镜（mri）对松树萎蔫病潜伏期、发育早期和发育后期的空化事件和栓塞发生情况进行无损监测，并与叶片水势和茎粗的变化进行比较。在疾病潜伏期，在未观察到栓塞的情况下，白天在缺水的日本黑松（Pinus thunbergii Parl.）幼苗中检测到空化事件，表明空化发生在单个管胞水平。在疾病早期，声发射事件的频率增加与团块气管水平斑块性栓塞的发生一致。这种大规模空化的阈水势高于在疾病潜伏期引起单个气管空化的阈水势。在疾病晚期，爆炸性声发射事件与栓塞区急剧扩大和水势降低同时发生。潜伏期AE事件仅发生在白天，而在疾病的早期和晚期，AE事件也发生在夜间。晚期突然出现的空化被认为是一种“失控栓塞”。
The occurrence of cavitation events and embolism during the latent, early stage and the late developmental stages of pine wilt disease was monitored nondestructively by acoustic emission (AE) and high-resolution magnetic resonance microscopy, respectively, and the results were compared with changes in leaf water potential and stem thickness. In the latent stage of the disease, when no embolisms were observed, cavitation events were detected by AE during the daytime in water-stressed Japanese black pine (Pinus thunbergii Parl.) seedlings, indicating that cavitation occurred at the individual tracheid level. In the early stage of the disease, an increase in the frequency of AE events occurred coincidentally with the occurrence of patchy embolisms at the mass tracheid level. The threshold water potential for such mass cavitation was higher than that causing cavitation of individual tracheids during the latent stage of the disease. In the advanced stage of the disease, explosive AE events were observed coincidentally with drastic enlargement of embolized areas and decreases in water potential. The AE events in the latent stage occurred only during the daytime, whereas, in the early and advanced stages of the disease, they also occurred at night. The explosive occurrence of cavitation in the advanced stage was thought to be a case of "runaway embolism."