Abstract
Interplant communication has been widely demonstrated in plants, especially in herbaceous plants. In this study, mechanical damage was shown to affect the levels of pyrochatechol, chlorogenic acid, gallic acid and p-hydroxyl benzoic acid in poplar (Populus simonii × P. pyramidalis ‘Opera 8277’) cuttings, indicating the activation of defense response. In neighboring intact cuttings, the levels of those phenolics also varied when compared to the control, suggesting the interplant communication between poplar cuttings. Three volatiles, methyl jasmonate, methyl salicylate and benzothiazole, were detected in volatiles emitted from mechanically damaged poplar cuttings. All of them can induce changes in the levels of four phenolics. Therefore, they could act as airborne signals between P. simonii × P. pyramidalis ‘Opera 8277’ cuttings. The different change patterns of phenolic contents induced by different volatiles imply that the defense response activated in neighboring plants may be regulated by multiple signaling pathways. The results also suggest that the entire defense response of plants involves a variety of airborne signals in wound-induced volatiles.





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Acknowledgments
We thank Prof Hongbo Gao and Dr. G. Hazenberg for valuable suggestions on the manuscript. This work was collectively supported by the Programme for Changjiang Scholars and the Innovative Research Team in Universities of China (PCSIRT0607), by the Key Science Programme of the State Forestry Administration of China (2006-59) and the National Key Project of Scientific and Technical Supporting Programmes Funded by the Ministry of Science & Technology of China (2006BAD01A15; 2006BAD24B04).
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Hu, Z., Shen, Y., Shen, F. et al. Evidence for the signaling role of methyl jasmonate, methyl salicylate and benzothiazole between poplar (Populus simonii × P. pyramidalis ‘Opera 8277’) cuttings. Trees 23, 1003–1011 (2009). https://doi.org/10.1007/s00468-009-0342-z
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DOI: https://doi.org/10.1007/s00468-009-0342-z


