Međuzavisnost prinosa i komponenti prinosa genotipova jare uljane repice (Brassica napus L.)

The research was conducted in order to determine yield related characters which are more effective as selection criteria than yield itself. Three spring canola (Brassica napus L.) genotypes have been investigated for plant height, number of primary branches (including the main raceme), number of pods per plant, pod length, number of seeds per pod, seed weight per pod and 1000 seed weight and their correlations with seed yield per plant. Seed yield had highest correlation with number of pods per plant (r= 0.935 and r= 0.973 in Skopje and Strumica, respectively), followed by seed weight per pod (r= 0.693 and r= 0.729) and 1000 seed weight (r= 0.627 and r= 0.680). Path coefficient analysis was used to identify the direct and indirect effect of studied characters on seed yield. Number of pods per plant (p=0.759 and p=0.877 for Skopje and Strumica, respectively) and seed weight per pod (p=0.216 and p=0.225) had the highest direct effect on seed yield in both locations followed by 1000 seed weight (p=0.056 and p=0.010). The coefficient of determination (R2) was 0.943.Istraživanje je sprovedeno sa ciljem da se determinšu komponente prinosa koje mogu pretstavljati efektivniji kriterijum za selekciju nego prinos "per se". Kod tri jara genotipa uljane repice (Brassica napus L.) su bila ispitivana svojstva: visina biljke, broj primarnih grana (uključujući i centralnu), broj ljuski po biljci, dužina ljuski, broj semena po ljusci, masa semena po ljusci i masa 1000 semena, kao i njihove korelacije sa prinosom semena po biljci. Broj ljuski po biljci je imao najveću vrednost koeficijenta korelacije sa prinosom po biljci (r= 0.935 i r= 0.973 u Skoplju i Strumici). Nešto manju vrednost je imao koeficijent korelacije za masu semena po ljusci (r= 0.693 i r= 0.729) i masa 1000 semena (r= 0.627 i r= 0.680). Analiza path koeficijenta je korišćena za razdvajanje direktnih i indirektnih uticaja ispitivanih svojstava na prinos semena. Broj ljuski po biljci (p=0.759 i p=0.877 za Skoplje i Strumicu) i masa semena po ljusci (p=0.216 i p=0.225) su imale najveći direktni efekat na prinos semena po biljci u obe lokacije. Nešto manja vrednost ovog pokazatelja izračunata je za masu 1000 semena (p=0.056 i p=0.010). Koeficijent determinacije (R2) je iznosio 0.94

Inheritance of the stem height of hybrids obtained by diallel cross of seven rice varieties(Oryza sativa L.)

The mode of inheritance and gene effect for stem height in diallel crosses of seven rice varieties in F1 and F2 generation were analyzed. The mode of inheritance analyzed for each combination separately is different and depends on the combination (intermediary, partial, dominant, negative heterosis). The varieties Loto, Medusa and Arborio Bjanko are the best general combiners in both hybrid generations. In combinations with good specific combining ability one of those varieties takes part. The values of the variance of both general and specific combining ability showed participation of the additive and dominant genes in the expression of this trait. Here, additive genes prevail. The same can be seen from the regression analysis

Diallel analysis for plant height in winter wheat

The mode of inheritance and gene effect for plant height of 7x7 half diallel crosses of wheat varieties and lines was evaluated in F1 and F2 generation. The mode of inheritance, calculated for each combination separately, was different and depended on the cross combination. The absence of interallelic interaction between the genes determining the expression of plant height was concluded from the regression analysis. The regression line intercepts the Wr axis below the origin in F1 indicating overdominance over an average of all arrays. In F2 the regression line cuts the Wr axis above the origin indicating partial dominance