Protein, lipid and isoflavone contents of food-type soybean lines at two sowing dates

Abstract

Few works have reported the relationship among genotype, temperature, rainfall and the chemical compounds of soybean. Therefore, the aim of this study was to investigate the interaction effect between soybean food-type inbred lines sowed in two different dates and the contents of protein, oil and isoflavones. Eight lines with null lipoxygenase seeds classified as food-type soybean were sowed in October 7 (early sowing) and October 29 (late sowing) at 2013/2014 crop year. The oil, protein and isoflavones contents were determined and the data were analyzed by variance analysis (ANOVA), principal component analysis (PCA) and UPGMA hierarchical. The genetic variability, sowing date and interactions between inbred lines and sowing date showed differences for all characteristics, except for oil content that did not showed a significant effect to the interaction. The greater participation of complex interaction was attributed to protein content with 87.82 %. According to PCA and UPGMA results, the food-type soybean lines were separated into three groups and were consistent in both sowing dates. The UEL 131 and UEL 153 lines showed the highest isoflavones content for the two sowing dates, indicating these genotypes as promising for breeding programs.

Yield, proteins, bioactive compounds and minerals in food-type soybean grains in different environments

“…Magnesium showed significance only for genotype, whereas total phenolic compounds and Cu were not influenced by the studied sources of variation (Table 1). In many studies, grain yield, weight and composition were influenced by genetic and/or environmental factors (Freiria et al, 2016;2018a;2018b) and the interaction between those factors resulted in differences in the performance of each genotype according to climatic conditions such as temperature, precipitation and photoperiod as well as factors related to type of soil.…”

“…Temperature is also the climatic variable most highly correlated with the protein percentage in soybean grains, especially during the grain-fill period. Freiria et al (2016;2018b) found higher protein percentages in higher temperature conditions when these were accompanied by lower precipitation rates.…”

“…According to the Ministry of Agriculture, Livestock and Supply (MAPA), the number of food-type soybean cultivars registered in Brazil is limited to 15 versus more than 1,500 grain-type cultivars (MAPA, 2019). Thus, the expansion of the food-type soybean market depends on new breeding programs and on the development of new cultivars free of L OX and including other favorable traits such as high grainyield potential, protein and mineral contents and presence of bioactive compounds (Freiria et al, 2016;2018a;2018b).…”