Abstract: In order to evaluate the effects of elevated air temperature under global change on the allelopathy and invasiveness of Mikania micrantha, an important alien invasive plant species in China, this paper studied the seed germination, seedling growth, biomass allocation, volatile components, and allelopathic potential of the plant under effects of three temperature (22, 26, and 30 ℃). After 3 days incubation, the seed germination rate of M. micrantha at 22， 26, and 30 ℃ was 29.2%, 52.4%, and 75.2%, respectively, being the highest at 30 ℃. Elevated temperature also increased the shoot length and biomass allocation to stem significantly. GC-MS and GC analyses showed that elevated temperature altered the chemical composition of the volatiles released from M. micrantha leaves. Bioassay demonstrated that elevated temperature increased the allelopathic effect of M. micrantha volatiles on the growth of Raphanus sativus and Brassica campestris seedlings. The results suggested that elevated temperature promoted the seed germination and seedling growth of M. micrantha, increased its allelopathic potential, and thereby, could accelerate the invasion of the plant.

Key words: LED, light quality, fruit quality, antioxidant capacity, yield.