Acclimation of photosynthesis to changes in the environment results in decreases of oxidative stress in arabidopsis thaliana

Karim, Mohd Fauzihan and Johnson, Giles Nicholas (2021) Acclimation of photosynthesis to changes in the environment results in decreases of oxidative stress in arabidopsis thaliana. Frontiers in Plant Science, 12. pp. 1-12. ISSN 1664462X

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Abstract

The dynamic acclimation of photosynthesis plays an important role in increasing the fitness of a plant under variable light environments. Since acclimation is partially mediated by a glucose-6-phosphate/phosphate translocator 2 (GPT2), this study examined whether plants lacking GPT2, which consequently have defective acclimation to increases in light, are more susceptible to oxidative stress. To understand this mechanism, we used the model plant Arabidopsis thaliana [accession Wassilewskija-4 (Ws-4)] and compared it with mutants lacking GPT2. The plants were then grown at low light (LL) at 100 μmol m−2 s−1 for 7 weeks. For the acclimation experiments, a set of plants from LL was transferred to 400 μmol m−2 s−1 conditions for 7 days. Biochemical and physiological analyses showed that the gpt2 mutant plants had significantly greater activity for ascorbate peroxidase (APX), guiacol peroxidase (GPOX), and superoxide dismutase (SOD). Furthermore, the mutant plants had significantly lower maximum quantum yields of photosynthesis (Fv/Fm). A microarray analysis also showed that gpt2 plants exhibited a greater induction of stress-related genes relative to wild-type (WT) plants. We then concluded that photosynthetic acclimation to a higher intensity of light protects plants against oxidative stress.

Item Type:	Article (Journal)
Uncontrolled Keywords:	light stress, oxidative stress, photosynthetic acclimation, antioxidants, reactive oxygen species
Subjects:	Q Science > QK Botany
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science > Department of Plant Science
Depositing User:	Dr Mohd Fauzihan Karim
Date Deposited:	19 May 2025 17:31
Last Modified:	19 May 2025 17:31
URI:	http://irep.iium.edu.my/id/eprint/121126

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