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Fatty Acid Composition of Oil from Erucic Acid‐Free Summer Rape Seed ( Brassica napus L.) in Relation to Nitrogen Nutrition and Raceme Position
Author(s) -
Ogunlela V. B.,
Kullmann A.,
Geisler G.
Publication year - 1990
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1111/j.1439-037x.1990.tb00835.x
Subject(s) - raceme , erucic acid , oleic acid , brassica , palmitic acid , stearic acid , chemistry , palmitoleic acid , linoleic acid , food science , fatty acid , linolenic acid , botany , biology , biochemistry , organic chemistry , inflorescence
Abstract A greenhouse study was conducted to determine the effect of nitrogen supply (30, 100 or 170 ppm N) and raceme position on the fatty acid composition of oil extracted from erucic acid‐free summer rape seed ( Brassica napus cv. Callypso ). The seven fatty acids analyzed for include palmitic, palmitolcic, stearic, oleic, linoleic, linolemc, and eicosenoic acids; of which oleic (59.54–64.84 %) and palmitoleic (0.36–0.4 %) acids were the highest and lowest levels respectively. Generally, N nutrition influenced fatty acid pattern only to a little extent. Palmitic, palmitoleic and stearic acid levels were increased by 170 ppm N, depending on raceme position, but oleic and linolenic acids were unaffected. Similarly, 170 ppm N produced the highest fatty acid levels in seeds on the lower portions of racemes, with the exception of oleic acid. This was also true in the case of the upper portions of racemes, except that 30 ppm N produced the highest levels of oleic and linoleic acids in rape seeds. Under the optimum N supply level (i.e. 100 ppm N), position of raceme on the rape plant did not greatly influence the levels of different fatty acids in lipids.