Amplification of plant volatile defence against insect herbivory in a warming Arctic tundra

Supplementary data for the article: Li et al. (2019). Amplification of plant volatile defence against insect herbivory in a warming Arctic tundra. Nature Plants. http://dx.doi.org/10.1038/s41477-019-0439-3 The study employs long-term in situ warming to assess the impacts of warming and insect herbivory on plant volatile organic compound emissions from the widespread circumpolar dwarf birch (Betula nana), a major player in ongoing Arctic greening. The experiment comprises open top chambers in place during summer on an arctic tundra heath in northern Sweden for 8 and 18 years in a randomized complete block design. The study involves three independent experiments. The first experiment describes the impacts of experimental warming and mimicked insect herbivory (exogenous application of methyl jasmonate) on Betula nana volatile emissions (n=18). The second experiment describes volatile emission kinetics of Betula nana upon either real insect herbivory (autumnal moth, Epirrita autumnata) or mimicked insect herbivory (n=4). The third experiment describes the effects of experimental warming on insect herbivory pressure on Betula nana (n=18).本数据集为下述论文的补充数据：Li等（2019）发表于《自然-植物》（Nature Plants）的《升温北极苔原中植物挥发性防御对昆虫植食作用的放大效应》，论文DOI链接：http://dx.doi.org/10.1038/s41477-019-0439-3 本研究采用长期原位升温实验，以评估升温与昆虫植食作用对环北极广布物种矮桦（Betula nana）挥发性有机化合物（volatile organic compound, VOC）排放的影响，该物种是当前北极绿化进程中的关键组成物种。实验采用随机完全区组设计，在瑞典北部北极苔原灌丛生境中设置开顶式气室（open top chambers, OTC），夏季开展原位实验，实验周期分别为8年与18年。 本研究包含3组独立实验：第一组实验探究了实验升温与模拟昆虫植食作用（外源施加茉莉酸甲酯（methyl jasmonate, MeJA））对矮桦挥发性有机化合物排放的影响（样本量n=18）；第二组实验测定了矮桦在真实昆虫植食（秋尺蛾（Epirrita autumnata）取食）或模拟昆虫植食作用下的挥发性排放动力学特征（样本量n=4）；第三组实验分析了实验升温对矮桦所受昆虫植食压力的影响（样本量n=18）。