Carotenoids in Long Orange Carrot - published: 04/10/2025

Extract

[...] This means that the old white carrots have a high lignin content unlike the long orange carrots. This explains that the texture of the long orange carrot is preferable to the old white carrot, less fibrous, and with a higher nutritional interest. Finally, according to the experiment to highlight the presence of reducing sugars -such as glucose or saccharose-, carried out according to the protocol in document we can observe a red coloration for both the old white carrot and the long orange carrot. [...]

[...] This means that the long orange carrot contains carotenoids, unlike the old white carrot. On the other hand, we did not observe the presence of xanthophylls on our chromatography for any of the carrots, so either they were not present in the carrots or the amount of sample deposited was too small to highlight them. In addition to the aesthetic contribution they bring to the carrot, due to the orange coloration, the carotenoids present in the long orange carrot bring an additional nutritional interest for Man. [...]

[...] Thus To conclude, we can see that the domestication of carrots has made it possible to obtain carrots commonly known and referred to as long orange carrots, with characteristics more favorable to humans. These long orange carrots, for which the transcription of the PSY1 and PSY2 genes is much higher than in the old white carrot, thus favor the carotene content of the carrots. Moreover, the domestication of carrots has made it possible to obtain carrots for which we have a clear reduction in lignin content, and an increased content of reducing sugars, thus making the carrot more interesting from a gustatory and nutritional point of view. [...]

[...] This would explain the fact that the long orange carrot has a more pronounced sweet taste. In comparison, the domestication of the carrot, resulting in the long orange carrot, presents more favorable characteristics to humans, both from a gustatory and nutritional point of view, compared to the old white carrot. Study of the genes targeted by the domestication of the carrot We want to specify the genes that have been targeted by the domestication of the carrot in order to make it more favorable to humans. [...]

[...] The results of these experiments are presented in the table below: Tested vegetable Old White Carrot Carrot long orange Results of pigment separation. Migration by chromatography after depositing crushed carrot samples on paper strips, soaked in a solvent, followed by a 20-minute incubation in the dark (protocol according to document Results of lignin stainingine. Revelation of lignin presence by phloroglucinol staining in acidic medium on fine transverse sections of carrots (protocol according to document Results of the highlighting of reducing sugars. [...]