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Int J Environ Res Public Health

Title:		Impacts of Drought and Rehydration Cycles on Isoprene Emissions in Populus nigra Seedlings
Author(s):		Han Z; Zhang Y; Zhang H; Ge X; Gu D; Liu X; Bai J; Ma Z; Tan Y; Zhu F; Xia S; Du J; Tan Y; Shu X; Tang J; Sun Y;
Address:		"School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China. Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou 511486, China. Jinan Ecology and Environment Monitoring Center of Shandong Province, Jinan 250101, China. Division of Environment and Sustainability, The Hong Kong University of Science and Technology, Hong Kong 999077, China. Key Lab of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China. LAGEO, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China. 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. School of Environment and Energy, Peking University, Shenzhen 518055, China"
Journal Title:		Int J Environ Res Public Health
Year:		2022
Volume:		20221105
Issue:		21
Page Number:		-
DOI:		10.3390/ijerph192114528
ISSN/ISBN:		1660-4601 (Electronic) 1661-7827 (Print) 1660-4601 (Linking)
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/physiology Droughts Seedlings Photosynthesis *Volatile Organic Compounds Plants Fluid Therapy Plant Leaves Populus nigra drought isoprene rehydration;
Notes:		"MedlineHan, Zhiyu Zhang, Yisheng Zhang, Houyong Ge, Xuan Gu, Dasa Liu, Xiaohuan Bai, Jianhui Ma, Zizhen Tan, Yan Zhu, Feng Xia, Shiyong Du, Jinhua Tan, Yuran Shu, Xiao Tang, Jingchao Sun, Yingjie eng Research Support, Non-U.S. Gov't Switzerland 2022/11/12 Int J Environ Res Public Health. 2022 Nov 5; 19(21):14528. doi: 10.3390/ijerph192114528"