Heat-Responsive Proteomics of a Heat-Sensitive Spinach Variety

• Published in: International journal of molecular sciences Vol. 20; no. 16; p. 3872
• Main Authors: Li, Shanshan, Yu, Juanjuan, Li, Ying, Zhang, Heng, Bao, Xuesong, Bian, Jiayi, Xu, Chenxi, Wang, Xiaoli, Cai, Xiaofeng, Wang, Quanhua, Wang, Pengcheng, Guo, Siyi, Miao, Yuchen, Chen, Sixue, Qin, Zhi, Dai, Shaojun
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 08.08.2019; MDPI
• Subjects: Antioxidants; Antioxidants - metabolism; Biosynthesis; Calcium homeostasis; Calcium signalling; Cell cycle; Chlorophyll; Computational Biology - methods; Electrophoresis, Gel, Two-Dimensional; Enzymes; Gene expression; Glutathione peroxidase; Glutathione reductase; Glutathione transferase; Glycolysis; heat response; Heat stress; Heat tolerance; heat-sensitive spinach variety; Heat-Shock Response - genetics; Homeostasis; Hot Temperature; Membrane trafficking; Metabolic pathways; Metabolism; Metabolites; Molecular Sequence Annotation; Morphology; Nucleotides; Pentose; Pentose phosphate pathway; Peroxidase; Phenotype; Photosynthesis; Plant Leaves - metabolism; Plant Proteins - metabolism; Protein Interaction Mapping; Protein Interaction Maps; Protein synthesis; Proteins; Proteome; Proteomics; Proteomics - methods; Reactive Oxygen Species - metabolism; Reductases; ROS scavenging; Signal transduction; Spinach; Spinacia; Spinacia oleracea - physiology; Vitamins; heat-sensitive spinach variety; proteomics; ROS scavenging; heat response
• ISSN: 1422-0067; 1661-6596; 1422-0067
• DOI: 10.3390/ijms20163872

High temperatures seriously limit plant growth and productivity. Investigating heat-responsive molecular mechanisms is important for breeding heat-tolerant crops. In this study, heat-responsive mechanisms in leaves from a heat-sensitive spinach ( L.) variety Sp73 were investigated using two-dimensional gel electrophoresis (2DE)-based and isobaric tags for relative and absolute quantification (iTRAQ)-based proteomics approaches. In total, 257 heat-responsive proteins were identified in the spinach leaves. The abundance patterns of these proteins indicated that the photosynthesis process was inhibited, reactive oxygen species (ROS) scavenging pathways were initiated, and protein synthesis and turnover, carbohydrate and amino acid metabolism were promoted in the spinach Sp73 in response to high temperature. By comparing this with our previous results in the heat-tolerant spinach variety Sp75, we found that heat inhibited photosynthesis, as well as heat-enhanced ROS scavenging, stress defense pathways, carbohydrate and energy metabolism, and protein folding and turnover constituting a conservative strategy for spinach in response to heat stress. However, the heat-decreased biosynthesis of chlorophyll and carotenoid as well as soluble sugar content in the variety Sp73 was quite different from that in the variety Sp75, leading to a lower capability for photosynthetic adaptation and osmotic homeostasis in Sp73 under heat stress. Moreover, the heat-reduced activities of SOD and other heat-activated antioxidant enzymes in the heat-sensitive variety Sp73 were also different from the heat-tolerant variety Sp75, implying that the ROS scavenging strategy is critical for heat tolerance.