Ocena efektu heterozji cech struktury plonu mieszańców pojedynczych i mieszańców trójliniowych rzepaku (Brassica napus L.)

The winter oilseed rape (Brassica napus L.) is one of the most important oil plants in Poland and world wide. Utilization of heterosis has greatly increased rapeseed fertility of hybrid varieties. The aim of this work was to estimate the heterosis in two populations of winter oilseed rape. The poster presents the heterosis responce occurred in plant height, silique length, number of seeds per silique and the thousand seed weight. In single cross hybrids the heterosis response was calculated over the average parents (DH and CMS line), while in three-way cross hybrids - over the average of two “direct” parents (CMS/DH hybrid and Rfo line) or over the average of three “indirect” parents (DH, CMS and Rfo line). The tested hybrids showed both highly significant positive and negative heterosis in the studied traits.