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Vegetable crops can be significant sources of nutritionally important dietary carotenoids and  Brassica  vegetables are sources that also exhibit antioxidant and anticarcinogenic activity. The family  Brassicaceae  contains a diverse group of plant species commercially important in many parts of the world. The six economically important  Brassica  species are closely related genetically. Three diploid species ( B. nigra, B. rapa,  and  B. oleracea ) are the natural progenitors of the allotetraploid species ( B. juncea, B. napus,  and  B. carinata ). The objective of this study was to characterize the accumulation of important dietary carotenoid pigments among the genetically related  Brassica  species. The HPLC quantification revealed significant differences in carotenoid and chlorophyll pigment accumulation among the  Brassica  species.  Brassica nigra  accumulated the highest concentrations of lutein, 5,6-epoxy lutein, violaxanthin, and neoxanthin. The highest concentrations of beta-carotene and total chlorophyll were found in  B. juncea. Brassica rapa  accumulated the highest concentrations of zeaxanthin and antheraxanthin. For each of the pigments analyzed, the diploid  Brassica  species accumulated higher concentrations, on average, than the amphidiploid species.  Brassicas  convey unique health attributes when consumed in the diet. Identification of genetic relationships among the  Brassica  species would be beneficial information for improvement programs designed to increase carotenoid values.

(167) Carotenoid Accumulation Among the Diploid and Amphidiploid Brassica Species