To understand the mitigation effects of melatonin on the chilling-induced photoinhibition in tomato, four groups of seedlings were labelled: NW (normal temperature + water), NM (normal temperature + melatonin), CW (chilling + water) and CM (chilling+ melatonin). We measured chlorophyll fluorescence, key photosynthetic parameters and the cycle efficiency for chloroplast ascorbic acid-glutathione (AsA-GSH). The results showed that, compared with the NW control, photosynthesis rate in CW was decreased by 50.3%-72.6%, chloroplast malondialdehyde content was decreased by 17.5%-132.7%, superoxide anion production was increased by 86.5%-235.9%, and HO was increased by 96.6%-208.4%. These trends were significantly alleviated by exogenous melatonin, with photosynthetic rates in CM being increased by 22.7%-24.7% compared with in CW, malondialdehyde content being decreased by 16.6%-29.0%, the rate of superoxide anion production being decreased by 14.9%-22.7%, HO content being decreased by 10.7%-27.1%. Compared with CW, the quantum yield of photochemical energy in PS Ⅱ was increased by 15.8% in CM, the quantum yield of regulated non-photochemical energy loss was increased by 7.2%, the quantum yield of non-regulated non-photochemical energy loss was decreased by 24.7%, and the activities of key metabolic enzymes in the AsA-GSH cycle were increased to different degrees. We concluded that exogenous melatonin application could alleviate photoinhibition in tomato seedlings under chilling by balancing the partitioning of absorption energy in PS Ⅱ and by enhancing the ROS scavenging efficiency of the AsA-GSH cycle in the chloroplast.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.13287/j.1001-9332.202301.015 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Unveiling exogenous potential of phytohormones as sustainable arsenals against plant pathogens: molecular signaling and crosstalk insights.
Mol Biol Rep
January 2025
Department of Biochemistry, Maharshi Dayanand University, Rohtak, 124001, India.
Plants frequently confront pathogens that disrupt physiological and molecular functions, ultimately reducing agricultural yields. To counter these challenges, plants activate sophisticated defense mechanisms to recognize stress signals while optimizing growth. Phytohormones signaling pathways and their crosstalk are central to regulating plant growth, development and defense.
View Article and Find Full Text PDFFunctional interaction of melatonin with gasotransmitters and ROS in plant adaptation to abiotic stresses.
Front Plant Sci
December 2024
Institute of Food Biotechnology and Genomics, National Academy of Sciences of Ukraine, Kyiv, Ukraine.
Melatonin is considered a multifunctional stress metabolite and a novel plant hormone affecting seed germination, root architecture, circadian rhythms, leaf senescence, and fruit ripening. Melatonin functions related to plant adaptation to stress stimuli of various natures are considered especially important. One of the key components of melatonin's stress-protective action is its ability to neutralise reactive oxygen species (ROS) and reactive nitrogen species directly.
View Article and Find Full Text PDFMelatonin Affects Peucedanum praeruptorum Vegetative Growth and Coumarin Synthesis by Modulating the Antioxidant System, Photosynthesis, and Endogenous Hormones.
J Pineal Res
November 2024
School of Pharmacy, Anhui University of Chinese Medicine, Hefei, China.
The dried root of Peucedanum praeruptorum is often used medicinally and has high pyran- and furanocoumarin content. Although exogenous melatonin (MT) impacts the regulation of plant growth, stress responses, secondary metabolism, etc., it remains unclear whether MT regulates the vegetative growth and development of P.
View Article and Find Full Text PDFFunctional interactions among H2O2, NO, H2S, and melatonin in the physiology, metabolism, and quality of horticultural Solanaceae.
J Exp Bot
December 2024
Group of Antioxidants, Free Radicals and Nitric Oxide in Biotechnology, Food and Agriculture, Department of Biochemistry, Cell and Molecular Biology of Plants, Estación Experimental del Zaidín, Spanish National Research Council (CSIC), Granada, Spain.
Cellular signaling is a key component of both intra- and intercellular communication, playing a crucial role in the development of higher plants as well as in their responses to environmental conditions of both abiotic and biotic origin. In recent decades, molecules such as hydrogen peroxide (H2O2), nitric oxide (NO), hydrogen sulfide (H2S), and melatonin have gained significant relevance in plant physiology and biochemistry due to their signaling functions and their interactions, forming a comprehensive cellular communication network. The Solanaceae family of plants includes a group of horticultural crops of great global importance, for instance, tomatoes, eggplants, and peppers, which are of major agroeconomic significance due to their widespread cultivation and consumption.
View Article and Find Full Text PDFExogenous melatonin improves drought stress tolerance via regulating tryptophan metabolism and flavonoid biosynthesis pathways in wheat.
Physiol Plant
December 2024
College of Life Sciences, Qingdao Agricultural University, Qingdao, PR China.
Melatonin (MT) serves an indispensable function in plant development and their response to abiotic stress. Although numerous drought-tolerance genes have been ascertained in wheat, further investigation into the molecular pathways controlling drought stress tolerance remains necessary. In this investigation, it was observed that MT treatment markedly enhanced drought resistance in wheat by diminishing malondialdehyde (MDA) levels and augmenting the activity of antioxidant enzymes POD, APX, and CAT compared to untreated control plants.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!