急性O3胁迫下米槠类异戊二烯释放及其对O3生成潜势的影响

doi:10.13292/j.1000-4890.202411.026

摘要/Abstract

摘要： 类异戊二烯（主要包括异戊二烯ISO和单萜烯MTs）是植物源挥发性有机化合物（BVOCs）中一类最重要的化合物，在大气环境中有重要作用。本研究以2年生米槠（Castanopsis carlesii）为对象，设置O₃-CK（大气背景浓度）、O₃-250（O₃浓度250 ppb）、O₃-500（O₃浓度500 ppb）3个处理，对米槠进行8 h、16 h的急性O₃胁迫，研究急性O₃胁迫下米槠BVOCs释放对O₃生成潜势（ozone formation potential，OFP）及生理指标的影响。结果表明：急性O₃胁迫8 h后，随O₃浓度升高，MTs释放速率高于对照组，在O₃-250处理下达到峰值（52.72±35.72 pmol·m^-2·s^-1），ISO释放速率低于对照组，在O₃-500处理下降至最低（0.70±0.27 pmol·m^-2·s^-1）。MTs组分中γ-松油烯、柠檬烯含量显著增加，α-蒎烯、柠檬烯对OFP贡献较大。急性O₃胁迫16 h后，随O₃浓度升高，MTs释放速率高于对照组，ISO释放速率无显著变化。3-蒈烯含量显著增加，α-蒎烯、柠檬烯、3-蒈烯对OFP贡献较大。总体上，O₃胁迫导致MTs合成酶和ISO合成酶显著降低，随胁迫时间延长，米槠光合速率、MTs和ISO释放速率均降低。急性O₃胁迫促进MTs排放，抑制ISO排放，进而整体促进OFP。本研究可为今后近地表O₃浓度增加背景下植物BVOCs释放对O₃的响应以及BVOCs对O₃形成的机理研究提供理论依据。

关键词: 臭氧, 异戊二烯, 单萜烯, 生物源挥发性有机化合物, 臭氧生成潜势

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)

廖露露, 张哿烨, 张峻川, 陈红梅, 李强, 易志刚. 急性O₃胁迫下米槠类异戊二烯释放及其对O₃生成潜势的影响[J]. 生态学杂志, 2024, 43(11): 3266-3272.

LIAO Lulu, ZHANG Geye, ZHANG Junchuan, CHEN Hongmei, LI Qiang, YI Zhigang. Isoprenoid release from Castanopsis carlesii under acute O₃ stress and its effect on ozone formation potential.[J]. Chinese Journal of Ecology, 2024, 43(11): 3266-3272.

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急性O₃胁迫下米槠类异戊二烯释放及其对O₃生成潜势的影响

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

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