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Nutrients 2014, 6(2), 546-563; doi:10.3390/nu6020546

Carotenoid Biosynthetic and Catabolic Pathways: Gene Expression and Carotenoid Content in Grains of Maize Landraces

Embrapa Temperate Agriculture, BR 396, Km 78, P.O. Box 403, Pelotas-RS 96010-900, Brazil
Federal University of Rio Grande do Sul, Biotechnology Center, Av. Bento Gonçalves 9500, P.O. Box 15005, Porto Alegre-RS 91501-970, Brazil
Federal University of Pelotas, Eliseu Maciel Agronomy College, Campus Universitário s/n, P.O. Box 354, Pelotas-RS 96010-900, Brazil
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Received: 11 September 2013 / Revised: 19 November 2013 / Accepted: 10 December 2013 / Published: 28 January 2014
(This article belongs to the Special Issue Vitamin A and Carotenoids)
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Plant carotenoids have been implicated in preventing several age-related diseases, and they also provide vitamin A precursors; therefore, increasing the content of carotenoids in maize grains is of great interest. It is not well understood, however, how the carotenoid biosynthetic pathway is regulated. Fortunately, the maize germplasm exhibits a high degree of genetic diversity that can be exploited for this purpose. Here, the accumulation of carotenoids and the expression of genes from carotenoid metabolic and catabolic pathways were investigated in several maize landraces. The carotenoid content in grains varied from 10.03, in the white variety MC5, to 61.50 μg·g−1, in the yellow-to-orange variety MC3, and the major carotenoids detected were lutein and zeaxanthin. PSY1 (phythoene synthase) expression showed a positive correlation with the total carotenoid content. Additionally, the PSY1 and HYD3 (ferredoxin-dependent di-iron monooxygenase) expression levels were positively correlated with β-cryptoxanthin and zeaxanthin, while CYP97C (cytochrome P450-type monooxygenase) expression did not correlate with any of the carotenoids. In contrast, ZmCCD1 (carotenoid dioxygenase) was more highly expressed at the beginning of grain development, as well as in the white variety, and its expression was inversely correlated with the accumulation of several carotenoids, suggesting that CCD1 is also an important enzyme to be considered when attempting to improve the carotenoid content in maize. The MC27 and MC1 varieties showed the highest HYD3/CYP97C ratios, suggesting that they are promising candidates for increasing the zeaxanthin content; in contrast, MC14 and MC7 showed low HYD3/CYP97C, suggesting that they may be useful in biofortification efforts aimed at promoting the accumulation of provitamin A. The results of this study demonstrate the use of maize germplasm to provide insight into the regulation of genes involved in the carotenoid pathway, which would thus better enable us to select promising varieties for biofortification efforts. View Full-Text
Keywords: Zea mays L.; landrace varieties; carotenoids; carotenoid-related genes; carotenoid cleavage dioxygenases Zea mays L.; landrace varieties; carotenoids; carotenoid-related genes; carotenoid cleavage dioxygenases

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da Silva Messias, R.; Galli, V.; dos Anjos e Silva, S.D.; Rombaldi, C.V. Carotenoid Biosynthetic and Catabolic Pathways: Gene Expression and Carotenoid Content in Grains of Maize Landraces. Nutrients 2014, 6, 546-563.

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