The Effect of Exogenous Melatonin on the Photosynthetic Characteristics of Rhododendron simsii Under Cadmium Stress

Plants, Journal Year: 2025, Volume and Issue: 14(1), P. 125 - 125

Published: Jan. 3, 2025

Rhododendron simsii (R. simsii), a significant ornamental plant species, is adversely affected by the severe soil heavy metal pollution resulting from rapid industrialization, particularly in terms of its growth environment. Cadmium (Cd), representative pollutant, poses threat to and photosynthetic physiology. Despite importance understanding Cd stress resistance rhododendrons, research this area limited. This study focused on role exogenous melatonin (MT) mitigating Cd-induced stress, emphasizing impact Gas exchange parameters, prompt delayed fluorescence (DF), 820 nm modulated reflectance (Mr820), antioxidant enzyme activity, were measured. The findings revealed that under MT-free treatment imposed more limitation both stomatal non-stomatal processes R. leaves, significantly reducing net rate. In contrast, MT improved efficiency increasing maximum photochemical photosystem II, quantum yield electron transport, performance index. DF Mr820 analysis demonstrated provided robust protection donor receptor sides photosystems I II. Furthermore, decreased malondialdehyde (MDA) content, marker oxidative enhanced activity enzymes, including superoxide dismutase (SOD) guaiacol peroxidase (POD). conclusion, plays critical alleviating enhancing defense mechanisms safeguarding apparatus, thereby improving tolerance simsii.

Language: Английский

Exogenous 24-Epibrassinolide Improves Low-Temperature Tolerance of Maize Seedlings by Influencing Sugar Signaling and Metabolism

International Journal of Molecular Sciences, Journal Year: 2025, Volume and Issue: 26(2), P. 585 - 585

Published: Jan. 11, 2025

Low-temperature (LT) stress seriously affects the distribution, seedling survival, and grain yield of maize. At emergence stage, maize’s coleoptile is one most sensitive organs in sensing LT signaling and, general, it can envelop young leaves to protect them from damage. In addition, brassinolides (BRs) have been shown enhance tolerance various species, but effects BRs on coleoptiles maize seedlings under are unclear. Therefore, this study, pre-cultured Zheng58 were treated with or without 2.0 μM 24-epibrassinolide (EBR) at 25 °C 10 environments for five days analyze their physiological transcriptomic changes. Physiological analysis showed that a 10°C increased content glucose (0.43 mg g−1 FW), sucrose (0.45 starch (0.76 FW) compared 25°C environment. After exposed EBR application temperature days, contents these three sugars continued increase, reached 2.68 FW, 4.64 9.27 respectively, indicating sugar metabolism played key roles regulating seedlings. Meanwhile, transcriptome 84 15 differentially expressed genes (DEGs) enriched photosynthesis pathways, multiple DEGs involved pathways significantly up-regulated stimulation. Further speculated four responsible sucrose-phosphate synthetase (SPS, i.e., Zm00001d048979, probable synthase 5 Zm00001d012036, 1), (SUS, Zm00001d029091, 2 Zm00001d029087, 4) crucial nodes could potentially link other unknown form complex interaction networks tolerance. conclusion, our findings provide new insights into molecular mechanisms exogenous enhancing identified potential candidate be used breeding

Language: Английский