Quantity and quality effects in fatty acid segregation at winter oilseed rape hybrids (Brassica napus L.)

摘要

Segregations of fatty acid composition in F2 generations of rapeseed hybrids investigated till now had rather continuous character as typical for metric traits. Clearly defined zero erucic fraction occurring in relation 1:15 was found only at segregation in cross combinations "high erucic×zero erucic". (Harvey, Downey 1964, Kondra, Stefansson 1965, Krzyma(n)ski at al. 1967,Krzyma(n)ski, Downey 1968, Krzyma(n)ski 1970, J(o)nsson 1977, Anand, Downey 1981, Chen, Heneen 1989, Chen, Beversdorf 1990, Scheffler at al. 1997, Barret at al. 1998, Fourmann at al. 1998, Lühs at al. 1998). This continuous distribution observed for segregation of fatty acids may be a result: - of control of these traits by polygenic genes working on cumulative manner or - of masking the effects of main genes with small changes made by a number of modifying genes or - of interference of main gene effects with effects of non heritable variability like: physiological variation, environment influences, chemical analyses errors, non proper sampling. To explain the problem more exact study was conducted on segregation of fatty acids in hybrids of winter oilseed rape cultivated in Poland.