Impacts of Drought and Rehydration Cycles on Isoprene Emissions in Populus nigra Seedlings

Zhiyu Han; Yisheng Zhang; Houyong Zhang; Xuan Ge; Dasa Gu; Xiaohuan Liu; Jianhui Bai; Zizhen Ma; Yan Tan; Feng Zhu; Shiyong Xia; Jinhua Du; Yuran Tan; Xiao Shu; Jingchao Tang; Yingjie Sun

doi:10.3390/ijerph192114528

Impacts of Drought and Rehydration Cycles on Isoprene Emissions in Populus nigra Seedlings

Int J Environ Res Public Health. 2022 Nov 5;19(21):14528. doi: 10.3390/ijerph192114528.

Authors

Zhiyu Han¹, Yisheng Zhang^{1

2}, Houyong Zhang³, Xuan Ge³, Dasa Gu⁴, Xiaohuan Liu⁵, Jianhui Bai⁶, Zizhen Ma¹, Yan Tan¹, Feng Zhu⁷, Shiyong Xia⁸, Jinhua Du¹, Yuran Tan¹, Xiao Shu¹, Jingchao Tang¹, Yingjie Sun¹

Affiliations

¹ School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China.
² Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou 511486, China.
³ Jinan Ecology and Environment Monitoring Center of Shandong Province, Jinan 250101, China.
⁴ Division of Environment and Sustainability, The Hong Kong University of Science and Technology, Hong Kong 999077, China.
⁵ Key Lab of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China.
⁶ LAGEO, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China.
⁷ Hebei Key Laboratory of Soil Ecology, Key Laboratory of Agricultural Water Resources, Center for Agricultural Resources Research, Institute of Genetic and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang 050022, China.
⁸ School of Environment and Energy, Peking University, Shenzhen 518055, China.

Abstract

The volatile organic compounds emitted by plants significantly impact the atmospheric environment. The impacts of drought stress on the biogenic volatile organic compound (BVOC) emissions of plants are still under debate. In this study, the effects of two drought-rehydration cycle groups with different durations on isoprene emissions from Populus nigra (black poplar) seedlings were studied. The P. nigra seedlings were placed in a chamber that controlled the soil water content, radiation, and temperature. The daily emissions of isoprene and physiological parameters were measured. The emission rates of isoprene (F_iso) reached the maximum on the third day (D3), increasing by 58.0% and 64.2% compared with the controlled groups, respectively, and then F_iso significantly decreased. Photosynthesis decreased by 34.2% and 21.6% in D3 in the first and second groups, respectively. After rehydration, F_iso and photosynthesis recovered fully in two groups. However, F_iso showed distinct inconsistencies in two groups, and the recovery rates of F_iso in the second drought group were slower than the recovery rates of F_iso in the first groups. The response of BVOC emissions during the drought-rehydration cycle was classified into three phases, including stimulated, inhibited, and restored after rehydration. The emission pattern of isoprene indicated that isoprene played an important role in the response of plants to drought stress. A drought-rehydration model was constructed, which indicated the regularity of BVOC emissions in the drought-rehydration cycle. BVOC emissions were extremely sensitive to drought, especially during droughts of short duration. Parameters in computational models related to BVOC emissions of plants under drought stress should be continuously improved.

Keywords: Populus nigra; drought; isoprene; rehydration.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Droughts
Fluid Therapy
Photosynthesis
Plant Leaves
Plants
Populus* / physiology
Seedlings
Volatile Organic Compounds*

Substances

isoprene
Volatile Organic Compounds

Grants and funding

This research was funded by the Research Fund Program of Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality (GHML2021-103) and the Open Project Fund of First-Class Discipline of Environmental Science and Engineering in Shandong (QUTSEME201911).