Effect of proteasome inhibitor MG132 on the expression of oxidative metabolism related genes in tomato

Expression analysis of antioxidant related genes may provide key information to develop plants more tolerant to abiotic and biotic stress. For this purpose, in this study, proteosome was inhibited by using MG132 proteosome inhibitor in Lycopersicon esculentum (tomato) tissues with high antioxidant content. We aimed to explain the response of gene isoforms associated with oxidative stress metabolism as a result of proteasome inhibition induced by MG132 in tomato. Gene expression levels of SLGR1, SLPhGPX, SLCAT1, SLFe-SOD, SLGPX, SLCu/Zn-SOD, SLcAPX and SLGST genes which are known to be associated with antioxidant mechanisms, were determined by real-time PCR in tomato. There was no significant change in SLPhGPX, SLCAT1, SL-Fe-SOD and SLcAPX genes in root, stem and leaf tissues. In addition, expression of SLGR1 and SLGST genes in root tissue was increased. In leaf tissue, expression of SLGPX, SLCu/Zn-SOD and SLGST genes increased significantly. There was no significant change in the expression of the genes studied in the shoot tissue. These results obtained from tomato root, stem and leaf tissues by creating proteasome inhibition will help to understand the relationship between antioxidant system and proteasome system in plants.