engleski

Advances in soybean lines development for conditions of the Eastern Croatia

The evaluations of agronomic values of new developed soybean elite reeding lines in comparative tests with check cultivars over wide range of environments are indicator of achieved genetic advance within the breeding program. The improving of genetic basis has significantly contributed to improvement of soybean production and further genetic improvement of cultivars, respectively. In this paperwill be given the results of testing new developed soybean elite breeding lines in compariosn with check cultivars through analysis of level and stability of grain yield, protein and oil content in grain, as well as their adaptability and tolerance on principal soybean diseases. The reseraches were conducted during the three-year period (2000-2002) at the experimental field of the Agricultural Institute Osijek (Croatia) and involved three sets of soybean genotypes (lines and checks) depending of maturity group (MG): Set1-MG0, Set 2-MGI and Set3 - MGII. The tested promising lines has developed from different hybridizations within the soybean breeding program at the Institute and derived from previously cycle of selection on the basis of their performances. Checks are released cultivars of Institute that have grown in commercial production in Croatia. The trials were design as randomized complete block with 3 replicates. The occurence and intensity of principal soybean disease were determined during researches: Peronospora manshurica at R2 stage and Diaporthe phaseolorum var. sojae, D.ph. var. caulivora and Sclerotinia sclerotiorum at R8 stage. Diseases intensity was evaluated visually at field and recorded on a 1 to 9 scale. Detection and identifiation of pathogen presence was evaluated in laboratory using standard phytopatological methods and with biomolecular method for pathogens from Diaporthe/Phomopsis complex.The obtained results of biometrical analysis in these study showed that the most tested elite breeding lines had significantly higher grain yield, protein and oil content in relation on checks in MG 0, I and II. Additionally, many tested promising lines, also, had good stability in analyzed traits, wide-general adaptability and high tolerance to major pathogens affecting soybean production in our country. In general, these data indicate on achieved genetic advance in grain yield, grain quality and tolerance on principal soybean diseases within our breeding programm. Also, the best new developed elite breeding lines make good genetic background for futher improving of soybean production in our country as well as for further genetic advance in soybean germplasm.

soybean; elite breeding lines; grain yield; grain quality; tolerance on principal diseases; stability; adaptability; genetic advance

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