Abstract
Aim of this research was determination of mode of inheritance, gene effects components of genetic variance, combining abilities, average contribution of lines and testers and their interactions in expression of stem thickness in forage sorghum F1 generation. Method line x tester was applied. Material comprised of eight genetically divergent A-inbred lines of grain sorghum three R lines-testers of Sudan grass and twenty-four F1 hybrids obtained by crossing lines with testers. Among tested genotypes there were significant differences in mean values of stem thickness. Analysis of variance of combining abilities showed that there were highly significant differences for general combining abilities (GCA) and specific combining abilities (SCA) non-additive component of genetic variance (dominance and epistasis) had greater portion in total genetic variance for stem thickness. During the first research year, interaction between inbred maternal line with testers had the largest contribution in expression of stem thickness of F1 hybrid at both locations, while in the second year at location Rimski Šančevi the largest contribution belongs to lines and at location Mačvanski Prnjavor the largest contribution belongs to testers. Assessment of combining abilities showed that these inbred lines of grain sorghum can be used as mothers: SS-1 646, SS-1 688 and S-8 682 in breeding forage sorghum for thicker stem. According to SCA, promising forage sorghum hybrids are S-8 682 x ST-R lin H and P-21 656 x C-198. This research can be of importance for developing new high-yielding forage sorghum hybrids.
Highlights
U prvoj godini ispitivanja najveći doprinos u ekspresiji debljine stabla F1 hibrida na oba lokaliteta imala je interakcija inbred linija majki sa testerima, u drugoj godini ispitivanja na lokalitetu Rimski Šančevi najveći doprinos pripada linijama, dok su na lokalitetu Mačvanski Prnjavor najveći doprinos imali testeri
Material comprised of eight genetically divergent A-inbred lines of grain sorghum, three R lines-testers of Sudan grass and twenty-four F1 hybrids obtained by crossing lines with testers
During the first research year, interaction between inbred maternal line with testers had the largest contribution in expression of stem thickness of F1 hybrid at both locations, while in the second year at location Rimski Šančevi the largest contribution belongs to lines and at location Mačvanski Prnjavor the largest contribution belongs to testers
Summary
Materijal korišćen u ovom radu obuhvata osam divergentnih citoplazmatsko muško sterilnih A-linija sirka za zrno: SS-1 646, SS-1 648, SS-1 688, S-8 682, P-21 656, P-74 633, P-170 630, P-174 621, tri R-restorer linije sudanske trave koje su korišćene kao testeri dobrih kombinacionih sposobnosti: C-198, ST-R lin H, ST-310 i 24 hibrida F1 generacije. Materijal je selekcionisan u Odeljenju za krmno bilje Instituta za ratarstvo i povrtarstvo u Novom Sadu na oglednom polju Rimski Šančevi. Na dva lokaliteta, na oglednom polju Instituta za ratarstvo i povrtarstvo u Novom Sadu i u Zemljoradničkoj zadruzi Mačvanski Prnjavor. Materijal je posejan u jednoredne parcele dužine 5 m u tri ponavljanja po slučajnom blok sistemu. Srednje vrednosti i pokazatelji varijabilnosti za debljinu stabla (cm) Table 1. Mean values and indicators of variability for stem thickness (cm)
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