Akademik Veri Yönetim Sistemi
Bahçe, cilt.55, sa.1, ss.11-18, 2026 (TRDizin)
Pear (Pyrus communis L.) production worldwide exceeds 26 million tons, with over 70% of this production occurring in China. The most significant disease that seriously reduces pear yield is fire blight, caused by the bacterial pathogen Erwinia amylovora. In terms of disease resistance, it is known that biochemical characteristics such as phenolic compounds play an important role in addition to the genetic characteristics of the variety.
This study aimed to compare the resistance levels of fire blight disease-resistant genotypes and susceptible cultivars using certain chemical analyses. According to the results, average the soluble solid content (SSC) ratio and pH value were found to be statistically significantly higher in resistant genotypes, while the total phenol value, catechin, and arbutin amounts were also found to be higher in resistant genotypes compared to susceptible cultivars. On the other hand, although titratable acidity (TA), total flavonoid and chlorogenic acid content were higher in susceptible varieties compared to resistant varieties, the results were not statistically significant. Among all cultivars and genotypes, genotype II-14-37 was found to have the highest values for total phenol, total flavonoid, chlorogenic acid, catechin, and arbutin content compared to the others. These results indicate that phenolic compounds play an important role in the resistance mechanism against fire blight in pears and that catechin and arbutin levels, in particular, can be used as potential biochemical indicators. Furthermore, SSC and pH values can also be added to these results as appropriate biochemical analyses.