Effects of artificial light at night and drought on the photosynthesis and physiological traits of two urban plants

Frontiers in Plant Science

Plant Science

Zhen Li¹  Dan Hu²  Yaxi Wei³  Jiaolong Zhang³ 

[1] State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, China;Department of Water Ecology and Environment, China Institute of Water Resources and Hydropower Research, Beijing, China;State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China;State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China;University of Chinese Academy of Sciences, Beijing, China;

关键词: urban plant;    artificial light at night;    drought stress;    fluorescence parameter;    gas exchange parameter;    physiological index;   

DOI  :  10.3389/fpls.2023.1263795

 received in 2023-07-20, accepted in 2023-09-25,  发布年份 2023

来源: Frontiers

【 摘 要 】

Urban plants are currently confronted with the stresses posed by artificial light at night (ALAN) and drought. A field block experiment was designed to explore the potential effects of ALAN and drought on the photosynthesis and physiological characters of two common urban plants, Euonymus japonicus (E. japonicus) and Rosa hybrida (R. hybrida). Each plant species was subjected to four distinct treatments: neither ALAN nor drought, ALAN, drought, and both ALAN and drought. The result showed the following: (1) ALAN significantly reduced the effective quantum yield (ΦPSII), apparent electron transfer rate (ETR), photochemical quenching parameter (qp), net photosynthetic (Pn), stomatal conductance (Gs), stomatal limit value (Ls), and the pigment concentrations and remarkably increased the content of malondialdehyde (MDA), total antioxidant capacity (TAC), and starch in both E. japonicus and R. hybrida. Furthermore, ALAN increased the soluble saccharides of E. japonicus, and this effect of ALAN also occurred on R. hybrida under drought. (2) Drought significantly decreased the ΦPSII, ETR, qp, Pn, Gs, Ls, and the pigment concentrations and remarkably increased the content of MDA and TAC for both E. japonicus and R. hybrida. Moreover, drought did not significantly change the starch content of both species, and it significantly increased the content of soluble saccharides for E. japonicus. (3) The interaction between ALAN and drought occurred on the ΦPSII, ETR, Pn, MDA, and TAC of E. japonicus, but had no effect on R. hybrida. For urban areas affected by ALAN and drought, it is advisable to select plant species with strong stress resistance for gardening purposes, and plants directly exposed to ALAN should receive sufficient water during hot and dry weather conditions to maintain their normal growth.

【 授权许可】

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Copyright © 2023 Wei, Li, Zhang and Hu