| Title: | Chlorophyll hormesis: Are chlorophylls major components of stress biology in higher plants? |
| Author(s): | Agathokleous E; Feng Z; Penuelas J; |
| Address: | "Institute of Ecology, Key Laboratory of Agrometeorology of Jiangsu Province, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China. Electronic address: evgenios@nuist.edu.cn. Institute of Ecology, Key Laboratory of Agrometeorology of Jiangsu Province, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China. CSIC, Global Ecology Unit CREAF-CSIC-UAB, 08193 Bellaterra, Catalonia, Spain; CREAF, 08193 Cerdanyola del Valles, Catalonia, Spain" |
| DOI: | 10.1016/j.scitotenv.2020.138637 |
| ISSN/ISBN: | 1879-1026 (Electronic) 0048-9697 (Linking) |
| Abstract: | "High oxidative stress inhibits the synthesis and accumulation of chlorophylls, the pigments that absorb and use light. We collated evidence from a diverse array of studies demonstrating that chlorophyll concentration increases in response to low-level stress and decreases in response to high-level stress. These observations were from 33 species, >20 stress-inducing agents, 43 experimental setups and 177 dose responses, suggesting generality. Data meta-analysis indicated that the maximum stimulatory response did not differ significantly among species and agents. The stimulatory response maximized within a defined time window (median = 150-160% of the control response), after which it decreased but remained elevated (median = 120-130% of control response). The common stimulation of chlorophylls by low-level stress indicates that chlorophylls are major components of stress biology, with their increased concentration at low-level stress suggestive of their requirement for normal functioning and health. Increased chlorophyll concentration in response to low-level stress may equip systems with an enhanced capacity for defense against high-level (health-threatening) challenges within defined time windows, such as pollution or herbivores. These developments have wide-ranging implications in ecophysiology, biotic interactions and evolution" |
| Keywords: | Chlorophyll *Embryophyta *Hormesis Oxidative Stress Biphasic response Chlorophylls Conditioning Hormesis Plant defense Stress biology; |
| Notes: | "MedlineAgathokleous, Evgenios Feng, ZhaoZhong Penuelas, Josep eng Meta-Analysis Netherlands 2020/04/25 Sci Total Environ. 2020 Jul 15; 726:138637. doi: 10.1016/j.scitotenv.2020.138637. Epub 2020 Apr 13" |
