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Chinese Journal of Ecology ›› 2024, Vol. 43 ›› Issue (11): 3266-3272.doi: 10.13292/j.1000-4890.202411.026

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Isoprenoid release from Castanopsis carlesii under acute O3 stress and its effect on ozone formation potential.

LIAO Lulu, ZHANG Geye, ZHANG Junchuan, CHEN Hongmei, LI Qiang, YI Zhigang*   

  1. (Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forest University, Fuzhou 350002, China).

  • Online:2024-11-10 Published:2024-11-06

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Abstract: Isoprenoids, mainly including isoprene and monoterpenes, are among the most important biogenic volatile organic compounds (BVOCs) from plants and play an important role in atmospheric environments. In this study, Castanopsis carlesii was treated with O3-CK (ambient O3 concentration), O3-250 (O3 concentration 250 ppb) and O3-500 (O3 concentration 500 ppb) for acute O3 stress of 8 h and 16 h. We investigated the effects of acute O3 stress on BVOc emissions from C. carlesii and the associated physiological parameters, as well as the contribution of BVOC emissions to ozone formation potential (OFP). The results showed that after 8 h acute O3 stress, the release rate of monoterpene was higher under the treatment with O3 stress than that of the control group, and reached a peak at O3-250 treatment (52.72±35.72 pmol·m-2·s-1), while the release rate of isoprene was lower than that of the control group. At the O3-250 treatment, it decreased to the lowest (0.70±0.27 pmol·m-2·s-1). The contents of γ-terpinene and limonene increased significantly, and α-pinene and limonene contributed more to OFP. After 16 h acute O3 stress, the release rate of monoterpene under O3 stress was higher than that of the control group, but the release rate of isoprene did not change. The content of 3-carene increased significantly, and α-pinene, limonene, 3-carene contributed more to OFP. Monoterpene synthetase and isopentadiene synthetase decreased significantly under O3 stress. Photosynthetic rate of C. carlesii and release rate of monoterpene and isopentadiene decreased with increasing stress time. Acute O3 stress promoted monoterpene emission and inhibited isoprene emission, with a positive effect on OFP as a whole. This study can provide theoretical basis for future studies on the response of BVOC release to O3 under the trend of near-surface O3 concentration increase and the mechanism of BVOCs on O3 formation.


Key words: ozone (O3), isoprene, monoterpenes, biogenic volatile organic compounds (BVOCs), ozone formation potential (OFP)