Sea buckthorn (Hippophaë rhamnoides L.) seeds on the 29th, 53rd, 80th, and 107th day after pollination were used for determining, by lipase hydrolysis, the qualitative and quantitative composition of the triacylglycerol (TAG) positional types, groups, and positional species, as well as the factor of selectivity of incorporation of unsaturated fatty acids, octadecenoic, linoleic, and linolenic, into the sn-2-position of TAGs. Until the 80th day after pollination, there was a predominant formation of triunsaturated TAGs, which included linolenic and linoleic acid residues. After the 80th day, the absolute content of these major components of total TAGs markedly decreased, and an increase in total TAG content was mainly accounted for by the rise in the level of those TAG species, which included saturated fatty acids, palmitic and stearic (monosaturated–diunsaturated and disaturated–monounsaturated), as well as in the level of sn-2-octadecenoyl species belonging to the triunsaturated and palmito–diunsaturated types of TAGs. At each maturation stage, the quantitative dynamics of separate TAG species was determined by the content of fatty acid species available for TAG formation and the factor of selectivity of these species. The decrease in the content of a certain group of triunsaturated TAGs found here seems to be caused by their metabolization during seed maturation.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 17, 2004
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