Analysis of combining abilities for plant height in forage sorghum and sudangrass using line x tester analysis

Abstract

Eight cms lines of forage sorghum (P-172, A 33 S nib.675, S-8 682, P-80 SS-3 678, P-48 642, P-158, SS-1 662, P-188) and two sudangrass R lines serving as testers (Savana -282, ST-312) were studied for their combining abilities for plant height in the first and second cuts in 2006. The combining abilities were calculated using line x tester analysis. Among the eight cms lines, the best general combiners were the line P48 642 in the first cut and the line P-172 in the second. Of the two Klines, the Sudan grass genotype ST-312 was the better general combiner in both cuts. The highest SCA value was found in the P-172 x Savana 282 cross in the first cut and in P-188 x ST 312 in the second. Positive SCA values in the two cuts were found in P-172 x ST- 312 A-33 S nib. 675 x Savana 282, and SS-1 662xST312.

Ispitivane su kombinacione sposobnosti za osam cms linije krmnog sirka (P-172, A 33 S hib.675, S-8 682, P-80 SS-3 678, P-48 642, P-158, SS-1 662 P-188) i dve R linije sudanske trave, koje su poslužile kao testeri (Savana -282, ST-312) za svojstvo visina biljaka u prvom i drugom otkosu u 2006. godini. Kombinacione sposobnosti su izračunati primenom analize linija x tester. Između osam cms linija najbolji opšti kombinator u prvom otkosu je bila linija P48 642, a u drugom otkosu linija P-172. Među R linijama u oba otkosa bolji opšti kombinator je bila sudanska trava ST-312. Najveću vrednost PKS je pokazalo ukrštanje P-172 x Savana 282 u prvom otkosu, odnosno u drugom otkosu ukrštanje P-188 x ST 312. Pozitivne vrednosti PKS u prvom i drugom otkosu imali su hibridi P-172 x ST- 312, A-33 S hib. 675 x Savana 282 i SS-1 662 x ST 312.