Allelopathic Effects of Volatile Substances from Artemisia tridentata Nutt

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Abstract
Volatile substances, probably terpenes, exuded from A. tridentata var. vaseyana may inhibit its associates under field conditions. At high concentrations volatile exudates inhibit the growth of seedlings, lower the respiration rates of juvenile plant material and raise the respiration rates of mature plant material. Monoterpenes found in Artemisia, the presumptive toxins, also raise the respiration rates of mature wheat leaves. Wheat plants exposed to Artemisia exudates in the field (chronic low concentrations) have higher respiration rates than controls. This suggests that volatile phytotoxins may inhibit established competitors as well as establishing competitors.