Abstract

AbstractOil and protein are the most important components of rape seeds. Total of them constitutes more than 2/3 of seed substance. Oil content in seeds of new low erucic varieties is considerably lower than in old high erucic varieties. There are two reasons: low genetical value of spring rape which was a source of zero erucic trait and lower biosynthesis of oil caused by block in chain elongation pathway from oleic to erucic acid. Bronowski variety used in crosses as a source of very low glucosinolate content introduced to breeding materials favourable genetic variability in oil and protein content. Breeding methods for higher oil and protein content was are discussed. Their efficiency is illustrated by calculated heritabilities and by results of field trial with different new varieties.

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