Combining abilities of rapeseed (Brassica napus L.) varieties

Abstract

The global acreage under rapeseed increases steadily. Rapeseed is grown for oil for human consumption, feed and biodiesel production. For faster advances in breeding, it is necessary to know variability and combining ability of selection material i.e. modes of inheritance of certain traits. General (GCA) and specific combining abilities (SCA) of five rapeseed varieties as well as the mode of inheritance of plant height, height to the first lateral branch, number of lateral branches and seed yield per plant were analyzed in this paper. Positive heterosis for plant height was found in five cross combinations, for the height to the first lateral branch in two combinations and for the number of lateral branches in only one combination and for seed yield in three cross combinations. .Povrsine pod uljanom repicom u svetu su u stalnom porastu. Uljana repica se gaji za dobijanje ulja za humanu konzumaciju, za proizvodnju stocne hrane i biodizela. Za brzi napredak u oplemenjivanju neophodno je poznavanje varijabilnosti i kombinacionih sposobnosti selekcionog materijala, odnosno nacina nasledjivanja pojedinih svojstava. U radu su analizirane opste (OKS) i posebne (PKS) kombinacione sposobnosti pet sorti uljane repice i nacin nasledjivanja visine biljke, visine prve bocne grane, broja bocnih grana i prinosa semena po biljci. Pozitivni heterozis ispoljio se za visinu biljke kod pet, za visinu prve bocne grane kod dve, broj bocnih grana kod jedne i prinosa semena kod tri kombinacije ukrstanja. .