Data notes on the proteomics of Dendrobium huoshanense under pb treatment.

OBJECTIVES: Pb stress has a negative impact on plant growth by interfering with photosynthesis and releasing reactive oxygen species, causing major risks such as heavy metal ion accumulation in the soil matrix. A proteomics experiment was conducted to determine whether protein levels of Dendrobium huoshanense changed in response to Pb stress seven to fifteen days after being sprayed with a 200 mg/L Pb (NO3)2 solution. The proteomic data we gathered provides a model for investigations into the mechanisms underlying Dendrobium plant resistance to heavy metal stress. DATA DESCRIPTION: A label-free quantitative proteomics approach was employed to examine the variations in protein expression levels of D. huoshanense at different times of Pb(NO3)2 treatment. We submitted the raw data obtained from these proteomics sequencing experiments to the ProteomeXchange database with the accession number PXD047050. 63,194 mass spectra in total were compared after being imported into the Proteome Discoverer software for database search. A total of 12,402 spectral peptides were identified with a confidence level exceeding 99%, which resulted in the identification of 2,449 significantly differential proteins. These proteins can be utilized for screening, functional annotation, and enrichment analysis of differentially expressed proteins before and after heavy metal treatment experiments.

Comparative analysis of POD genes and their expression under multiple hormones in Pyrus bretschenedri.

BACKGROUND: Class III peroxidase (POD) enzymes play vital roles in plant development, hormone signaling, and stress responses. Despite extensive research on POD families in various plant species, the knowledge regarding the POD family in Chinese pear (Pyrus bretschenedri) is notably limited. RESULTS: We systematically characterized 113 POD family genes, designated as PbPOD1 to PbPOD113 based on their chromosomal locations. Phylogenetic analysis categorized these genes into seven distinct subfamilies (I to VII). The segmental duplication events were identified as a prevalent mechanism driving the expansion of the POD gene family. Microsynteny analysis, involving comparisons with Pyrus bretschenedri, Fragaria vesca, Prunus avium, Prunus mume and Prunus persica, highlighted the conservation of duplicated POD regions and their persistence through purifying selection during the evolutionary process. The expression patterns of PbPOD genes were performed across various plant organs and diverse fruit development stages using transcriptomic data. Furthermore, we identified stress-related cis-acting elements within the promoters of PbPOD genes, underscoring their involvement in hormonal and environmental stress responses. Notably, qRT-PCR analyses revealed distinctive expression patterns of PbPOD genes in response to melatonin (MEL), salicylic acid (SA), abscisic acid (ABA), and methyl jasmonate (MeJA), reflecting their responsiveness to abiotic stress and their role in fruit growth and development. CONCLUSIONS: In this study, we investigated the potential functions and evolutionary dynamics of PbPOD genes in Pyrus bretschenedri, positioning them as promising candidates for further research and valuable indicators for enhancing fruit quality through molecular breeding strategies.

Ganoderic acid a decreased Aß42-induced neurotoxicity in PC12 cells by reduced mitochondrial damage.

Alzheimer's disease (AD) is a progressive neurodegenerative disorder. Accumulation of ß-amyloid (Aß) in the brain has been recognized as a key factor in the onset and progression of Alzheimer's disease (AD).The accumulation of Aß in the brain catalyzes the production of reactive oxygen species (ROS), which in turn triggers oxidative damage to cellular components such as DNA, lipids, and proteins. In the present study, we investigated the protective effect of Ganoderic acid A (GA.A) against Aß42-induced apoptosis in PC12 cells. Changes in mitochondrial membrane potential indicated that GA.A treats mitochondrial dysfunction by decreasing Aß42 deposition and inhibiting neural protofiber tangle formation. Changes in intracellular Ca2+ and caspase-3 indicated that GA.A reduced mitochondrial damage by Aß42 in PC12 cells, thereby decreasing ROS accumulation and reducing Aß protofiber-induced cytotoxicity. These features suggest that GA.A has great potential as an effective neuroprotective drug in the treatment of Alzheimer's disease.