قابلية الاتحاد و الفعل الجيني و التوريث في زهرة الشمس باستخدام سلالة x فاحص

Abstract EN

Seven inbred lines of sunflower crop were conducted in this study where carry fertility restoration genes and multi – heads (R-line) and two testing lines having cytoplasmic male sterile (A-line) with other similarity cytoplasmic fertile (B-line).

These lines (A-line) females and (R-line) males were put in crossing program on Line x Tester mating system , at spring season of 2008 in Field Crops Research Station of College of Agriculture / Tikrit University produced F1 seeds .

Genotypes (9 parents + 14 hybrids) were grown at spring season of 2009 using R.C.B.D.

with three replications to study general and specific combining ability and estimate some genetic parameters .

The results showed significant differences at 1 % level between genotypes for all characters studied .

Lines of R2 , R4 and R12 and second tester were showed good general combining ability in desire trend for most characters , the hybrids A1xR2 , A2xR4 were showed highly specific combining ability in desire trend for most characters.

Additive and dominance variance values were differed from zero for most studied characters.

Additive and non additive genes compained to get her to controlling in inheritance of most characters .

Heritability in broad sense values were higher for all characters , it ranged from (82.09%) for yield of seeds to (97.16%) for day of flowering in lines, and from (85.25%) for fertility percentage to (97.92%) for seed weight in testers, while heritability in narrow sense ranged from (20.33%) for stem diameter to (71.79%) for oil ratio in lines , while in testers ranged from (1.15%) for number of seeds to (88.18%) for oil yield , over dominance of genes were controlled for some characters where as bigger from one in degree of dominance , but other characters were governed under partial drominance effects, that mean of degree of dominance was less than one.

Therefor we can recomonded of using some of lines program of sunflower hybrid production .

A part of Ph.D.

Dissertation of first author