Melatonin induction and its role in high light stress tolerance in Arabidopsis thaliana

Journal of Pineal Research
Hyoung Yool Lee, Kyoungwhan Back

Abstract

In plants, melatonin is a potent bioactive molecule involved in the response against various biotic and abiotic stresses. However, little is known of its defensive role against high light (HL) stress. In this study, we found that melatonin was transiently induced in response to HL stress in Arabidopsis thaliana with a simultaneous increase in the expression of melatonin biosynthetic genes, including serotonin N-acetyltransferase1 (SNAT1). Transient induction of melatonin was also observed in the flu mutant, a singlet oxygen (1 O2 )-producing mutant, upon light exposure, suggestive of melatonin induction by chloroplastidic 1 O2 against HL stress. An Arabidopsis snat1 mutant was devoid of melatonin induction upon HL stress, resulting in high susceptibility to HL stress. Exogenous melatonin treatment mitigated damage caused by HL stress in the snat1 mutant by reducing O2- production and increasing the expression of various ROS-responsive genes. In analogy, an Arabidopsis SNAT1-overexpressing line showed increased tolerance of HL stress concomitant with a reduction in malondialdehyde and ion leakage. A complementation line expressing an Arabidopsis SNAT1 genomic fragment in the snat1 mutant completely restored HL stress susceptibil...Continue Reading

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Citations

Jul 10, 2020·The Plant Journal : for Cell and Molecular Biology·Kyoungwhan Back
Oct 23, 2019·International Journal of Molecular Sciences·Ok Jin Hwang, Kyoungwhan Back
Apr 3, 2020·Biomolecules·Ok Jin HwangKyoungwhan Back
May 1, 2021·International Journal of Molecular Sciences·Lin-Feng WangWen-Cheng Liu
May 12, 2021·BMC Genomics·Zhenyang LiaoRay Ming
Jun 25, 2021·Plant Physiology and Biochemistry : PPB·Yandi WuChonghuai Liu

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