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Plants release volatile organic compounds (VOCs) in response to wounding and herbivore attack, some of which trigger responses in neighboring unattacked plants in the laboratory under conditions that are not likely to occur in the real world. Whether plants ‘eavesdrop’ on the volatile emissions of their neighbors in nature is not known. The best documented field study of between-species signaling via above-ground VOCs involves increases in fitness parameters of native tobacco (Nicotiana attenuata) transplanted adjacent to clipped sagebrush (Artemesia tridentata tridentata). Clipped sagebrush releases many biologically active VOCs, including methyl jasmonate (MeJA), methacrolein and a series of terpenoid and...