Inheritance of a recessive character controlling reduced carotenoid pigmentation in carrot (Daucus carota L.)
Goldman, I.L. | Breitbach, D.N.
All previously identified white or nonpigmented carrot roots such as those from wild carrot and white derivatives of yellow or orange types have been dominant to the production of pigment, which is recessive. The primary pigments in orange carrot tissue are alpha and beta carotene. A reduced-pigment carrot root was discovered during routine propagation of the inbred line W266 in 1992. Subsequent segregation analysis in the F2 and BC1 generations in three genetic backgrounds demonstrated the reduction in pigmentation is due to a single recessive gene. We propose the symbol rp to describe the genetic control of this "reduced-pigment" phenotype. Total carotenoid content was reduced 92% in rprp genotypes compared to RPRP genotypes. Plants carrying rprp also exhibit white leaves during very early stages of development, suggesting rp has an effect on leaf chlorophyll content. This character may prove useful in dissecting the complex inheritance of carotenoids in carrot.
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