LC-MS/MS shotgun proteomics reveals biochemical mechanisms of Paspalum fasciculatum tolerance to Pb-stress

Abstract

Paspalum fasciculatum Willd. ex Flüggé grows in mining soils which are Cd-and Pb-contaminated where it exhibits tolerance to Pb and the ability to extract Pb from these soils. To elucidate tolerance mechanisms to Pb-stress, liquid chromatography with tandem mass spectrometry (LC-MS/MS) was used to quantify changes in the accumulation of proteins in leaves. We identified 323 proteins involved in primary metabolism and response to biotic or abiotic stresses. Although proteins involved in the processes of photosynthesis and saccharide and energy metabolism presented the greatest amount of down-regulated proteins, the plant was able to maintain photosynthetic functions and obtain energy to sustain the vital balance. P. fasciculatum based their tolerance on increased antioxidant defenses, improving the protection and repair of proteins and transduction signals to coordinate physiological response to Pb-stress. Our results provide important information to understand the tolerance mechanisms in P. fasciculatum and could be important in future molecular studies on the resistance and accumulation of Pb in plants.

Molecular evolution and interaction of 14-3-3 proteins with H+-ATPases in plant abiotic stresses

“…The copyright holder for this preprint (which this version posted May 22, 2023. ; https://doi.org/10.1101/2023.05.18.541295 doi: bioRxiv preprint 3-3 protein were observed at 4 h and 8 h of Cu stress in Phanerochaete chrysosporium (Okay et al, 2020). In addition, proteomics data indicated that 14-3-3 proteins might participate in Pb stress mechanisms in Paspalum fasciculatum (Salas-Moreno et al, 2022a). Micromolar magnesium could mitigate the toxicity of Al through promoting the phosphorylation of VHA2 (PM H + -ATPase) and improving the interaction between VHA2 and 14-3-3b in Vicia faba.…”