Soybean Breeding on Grain Quality

The breeding work on soybean at the Agricultural Institute Osijek primarily has aimed to increasing yields of soybean in Croatia. The improving of yield potential is based on the improvement of genetic basis of traits that determine its quantity and quality, applying the conventional breeding methods and outlines valid for self-polinated crops, such as soybean. The objective of this research was to evaluate grain quality of new developed soybean elite breeding lines in comparative tests with check cultivars into 00, 0 and I. maturity group (MG) during a three-year period (2001-2003) in Osijek. Tested elite breeding lines have developed from previously cycle of selection on the basis of their performances. Checks are released cultivars of the Institute that have grown in commercial production in Croatia. The grain quality value of tested genotypes was estimated through analysis of level and stability of protein and oil content in grain, as well as theirs adaptability. After stability analysis, on the part of tested materials which showed good stability and wide-general adaptability in oil content in grain were made analysis of triacylglycerols. The obtained results of biometrical analysis in these study showed that the most tested promising lines had significantly higher protein and oil content in grain in relation on checks in MG 00, 0 and I as well as good stability in analysed traits and wide-general adaptability. Analysis of triacylglycerols showed genetic variability in this trait. Generally, these data indicate on achieved genetic improvement of soybean cultivars in grain quality.