LED lights increase an antioxidant capacity of Arabidopsis thaliana under wound-induced stresses
Zahra Mirzahosseini A , Leila Shabani
A B D and Mohammad R. Sabzalian C
+ Author Affiliations
- Author Affiliations
A Department of Biology, Faculty of Sciences, Shahrekord University, Shahrekord, Iran.
B Research Institute of Biotechnology, Shahrekord University, Shahrekord, Iran.
C Department of Agronomy and Plant Breeding, College of Agriculture, Isfahan University of Technology, Isfahan 84156-83111, Iran.
D Corresponding author. Email: shabani-l@sku.ac.ir; lshabani@gmail.com
Functional Plant Biology 47(9) 853-864 https://doi.org/10.1071/FP19343
Submitted: 2 December 2019 Accepted: 13 April 2020 Published: 19 June 2020
Abstract
A comparison among four light emitting diode (LED) lights including red LED (R), blue LED (B), red (70%) + blue (30%) LED (RB) and white LED (W) as well as fluorescent (F) light was made on antioxidative capacity of Arabidopsis thaliana (L.) Heynh. in response to wounding. Under wound-stress condition, LED-exposed plants, especially RB-irradiated plants, maintained significantly higher shoot dry weight and antioxidant enzymes activities compared with those irradiated with fluorescent lights. The highest amounts of both chlorophyll a and b were observed in the leaves treated with B light. Also, the concentration of H2O2 was higher under the condition of RB and B lights compared with the other light environments. The highest amount of malondialdehyde was measured in plants exposed to F and B lights. Similarly, wounded leaves under F and B light conditions showed the maximum lipoxygenase activity, whereas R-exposed leaves had the lowest lipoxygenase activity. In contrast, the highest level of phenolic compounds was found in R and RB exposed leaves in response to wounding. Among the five light treatments, RB and B lights were more effective in stimulating anthocyanin synthesis; however, RB-exposed plants were more efficient in the late-induction of the PAL gene (phenylalanine ammonia lyase catalyses the first step of the general phenylpropanoid pathway). Collectively, we reasoned that RB light condition gives a superior capacity to Arabidopsis thaliana to tolerate wound-stress. Also, we propose the probable signalling role of ROS in light-stimulated wound responses in Arabidopsis.
Additional keywords: anthocyanin, antioxidant enzyme, Arabidopsis thaliana, light emitting diode, phenolic compounds, wounding.
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