مرکز منطقه ای اطلاع رساني علوم و فناوري - Yield of Brassica napus L. hybrids developed using resynthesised rapeseed material

Abstract :

Resynthesised (RS) rapeseed genotypes developed through interspecific crosses between diverse B. rapa and B. oleracea genotypes have the potential to significantly increase the available gene pool and provide important basic germplasm for further improvements of seed yield, seed quality traits, disease and pest resistance. Furthermore, RS rapeseed is potentially of great interest for hybrid breeding, since heterosis effects are higher in crosses of genetically distant materials. On the other hand, previous studies with RS material showed that raw amphidiploids derived from interspecific hybridisations are usually rather low yielding. The utilisation of such basic germplasm in commercial variety-breeding programmes is restricted to the development of intraspecific hybrids, so-called semi-synthetic rapeseed, and backcross progenies thereof. In order to determine the general combining ability (GCA) of different rapeseed material, nine high-erucic acid RS lines and three old spring rapeseed cultivars were used as pollinators of male-sterile double-low spring rapeseed lines (MSL system). Yield performance of the single-cross hybrids were tested in a two year field trial in Rauischholzhausen/Germany that revealed a high yield potential of semi-synthetic rapeseed hybrids based on RS lines. Developed test hybrids showed 1-15 % more yield compared with the control cultivar Senator. The use of such resynthesised rapeseed forms in developing hybrids and their possible use in future oilseed breeding is discussed based on two year results.