Abstract
We performed QTL analyses for pigment content on a carotenoid biosynthesis function map based on progeny of a wild white carrot (QAL) which accumulates no pigments × domesticated orange carrot (B493), one of the richest sources of carotenoid pigments—mainly provitamin A α- and β- carotenes. Two major interacting loci, Y and Y 2 on linkage groups 2 and 5, respectively, control much variation for carotenoid accumulation in carrot roots. They are associated with carotenoid biosynthetic genes zeaxanthin epoxidase and carotene hydroxylase and carotenoid dioxygenase gene family members as positional candidate genes. Dominant Y allele inhibits carotenoid accumulation. When Y is homozygous recessive, carotenoids that accumulate are either only xanthophylls in Y 2 __ plants, or both carotenes and xanthophylls, in y 2 y 2 plants. These two genes played a major role in carrot domestication and account for the significant role that modern carrot plays in vitamin A nutrition.
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Acknowledgments
This research was supported by Initiative for Future Agriculture Food Systems Grant number 2000-4258 from the USDA Cooperative Research, Education, and Extension Service. The senior author acknowledges the generous support of the Gabelman-Shippo Distinguished Graduate Fellowship in the Plant Breeding and Plant Genetics Program of the University of Wisconsin-Madison. We are grateful for the proficient technical assistance of Douglas Senalik.
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Communicated by I. Paran.
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Just, B.J., Santos, C.A.F., Yandell, B.S. et al. Major QTL for carrot color are positionally associated with carotenoid biosynthetic genes and interact epistatically in a domesticated × wild carrot cross. Theor Appl Genet 119, 1155–1169 (2009). https://doi.org/10.1007/s00122-009-1117-z
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DOI: https://doi.org/10.1007/s00122-009-1117-z