The effect of Septoria glycines Hemmi pathogenic agent on yield and biochemical parameters in soybean under the conditions of Primorye Territory

Abstract

This paper examines how Septoria glycines Hemmi pathogenic agent affects economically valuable traits and biochemical parameters in released soybean varieties under the conditions of Primorsky Krai. The correlation between weather conditions and the development of Septoria brown spot was revealed for soybean by monitoring the fungal infection process. The correlation analysis showed that there was a strong relationship between the disease severity and the protein content in seeds (r = 0.83). As for the oil content, an inverse relationship was revealed (r = –0.84). Both the development of S. glycines on leaves and the synthesis of proteins in seeds were maximal under favorable growth conditions. A low coefficient of the correlation (r = 0.19) between yield and resistance to Septoria brown spot proves that S. glycines does not have a significant effect on the yield formation. It was observed that Septoria brown spot negatively affected the development of the reproductive organs in soybean plants suppressing the genetic potential of the studied varieties. Worsening disease severity of soybean leaves led to a slight increase in the 1000 kernel weight.