Summary
Broad sense heritabilities and gene numbers were estimated for the production of total carotenoids and the major component carotenoids of carrot storage roots: phytoene, ζ-carotene, β-carotene, α-carotene, and lycopene. Two crosses with different backgrounds were evaluated: orange B493 × white QAL and orange Brasilia × dark orange HCM. The HCM (high carotene mass selection), Brasilia and B493 parents had both α-carotene and β-carotene, but HCM had proportionally more α-carotene. Carotene content in F 2 populations ranged from 522 ppm to 1714 ppm in Brasilia × HCM and from 0 to 695 ppm in B493 × QAL progeny. F 2 plants segregating for absence of α-carotene were identified in B493 × QAL. Broad-sense heritabilities ranged from 28% to 48% for all carotenes except lycopene and phytoene where estimates were 44% to 89% in the Brasilia × HCM cross, All heritability values exceeded 88% for the B493 × QAL cross, except one estimate for lycopene. The estimated number of genes was 4 conditioning α-carotene, 2 to 3 each for β-carotene and total carotenes and one each for ζ-carotene, lycopene and phytoene in the orange × dark orange cross. In the orange × white cross, the estimates were 4 genes for α-carotene, 1 to 2 each for lycopene and total carotenes and 1 for each of the other carotenes. These results are in general agreement with QTL studies and they provided evidence for continuous inheritance of α-carotene, β-carotene and total carotenoids in the orange × dark orange cross and discrete inheritance for β-carotene and total carotenoids in the orange × white cross.
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Part of thesis “Biometrical studies and quantitative trait loci associated with major products of the carotenoids pathway of carrot (Daucus carota L.)” presented by the first author as partial fulfillment of the requirement of the PhD degree in Plant Breeding and Plant Genetics, UW-Madison, USA, 2001.
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Fernandes Santos, C.A., Simon, P.W. Heritabilities and Minimum Gene Number Estimates of Carrot Carotenoids. Euphytica 151, 79–86 (2006). https://doi.org/10.1007/s10681-006-9130-7
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DOI: https://doi.org/10.1007/s10681-006-9130-7