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Wu Guoxiu,Li Shengli,Dong Yaoxin,Bi Huangai,Ai Xizhen 한국원예학회 2022 Horticulture, Environment, and Biotechnology Vol.63 No.5
Hydrogen sulfi de (H 2 S) and hydrogen peroxide (H 2 O 2 ) play signifi cant roles as signaling molecules in multiple physiological activities. However, the mechanism and relationship between H 2 S and H 2 O 2 in regulating chilling tolerance remain unclear. This study found that chilling stress induced both endogenous H 2 S and H 2 O 2 systems in cucumber seedlings. Exogenous NaHS (an H 2 S donor) treatment notably strengthened the mRNA abundance of respiratory burst oxidase homolog ( RBOH ), contributing to endogenous H 2 O 2 accumulation. However, H 2 O 2 had little eff ect on mRNA abundances and activities of L-/D-cysteine desulfhydrase (L/DCD), and endogenous H 2 S levels. NaHS and H 2 O 2 increased chilling tolerance in cucumber seedlings, as shown by decreased electrolyte leakage (EL), chilling injury indexes, reactive oxygen species (ROS), and malonaldehyde (MDA) content, and improved activities and expression levels of antioxidant enzymes as well as glutathion (GSH) and ascorbic acid (AsA) contents. Additionally, the photosynthetic rates (Pn), actual photochemical effi ciency (φPSII), maximum photochemical effi ciency (Fv/Fm), and mRNA abundances and activities of Calvin cycle enzymes (Rubisco, SBPase, FBA, and TK) were induced by NaHS and H 2 O 2 . Interestingly, the H 2 S-induced chilling tolerance was suppressed by dimethylthiourea (DMTU, an H 2 O 2 scavenger). The results illustrated that H 2 S repressed the negative eff ects of chilling stress by improving photosynthesis and alleviating oxidative damage, and H 2 O 2 may be a downstream signaling molecule in this process.
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Linxiang Tan,Wenjie Wu,Qiaoqiao Yin,Xiaoxia Ke,Ru Qiao,Guoxiu Tong,Lanlan Zhu 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.52 No.-
The dimer-type heterostructured Ag/Zn0.995Ni0.005O microspheres were prepared via two-stepmicrowave-assisted process, which exhibited stronger visible-light-activated antibacterial performancethan visible-light only, ZnO/Vis, Zn0.995Ni0.005O/Vis, or AgNPs/Vis. It is attributed to not only theinteraction of released metal ions with functional groups of vital enzymes and proteins, but also thecollapsing force of reactive oxygen species to the cells. Photoelectrochemical measurements show thatthe photogenerated charges of Ag/Zn0.995Ni0.005O possess longer lifetime and higher separation resultingfrom the synergistic effect between Ni and Ag, which leads to its superior visible-light-drivenantibacterial performance. Gram-negative bacteria are more effectively restrained by Ag/Zn0.995Ni0.005Othan Gram-positive bacteria because of structural difference between their cell walls.
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