A Study on the Cell Layer Patterns of a Citrus Periclinal Chimera Reveals β-Cryptoxanthin Regulation in Citrus Fruits.

ABSTRACT: As a dietary provitamin A carotenoid, β-cryptoxanthin is more bioavailable than common carotenoids. However, β-cryptoxanthin is a minor carotenoid in most crops, except for certain citrus species. A chimera (OCC) is identified, which grows from the graft junction between mandarin (OOO) and grapefruit (CCC), and it exhibits a unique β-cryptoxanthin profile. OCC is a periclinal chimera with the L1 cell layer from OOO and L2 and L3 layers from CCC. The flavedo, pulp, and segment membranes of OCC are generated from all three cell layers, but the proportions of these cell layers differ; OOO:CCC (L1:L2/L3) is ≈1:4 in the flavedo, 1:1 in the pulp, and 1:3 in the segment membrane. A nucleus-localized transcriptional activator, MYB107, is identified, which regulates β-cryptoxanthin variation betwee

SUBMITTER: Zhang C 

PROVIDER: S-EPMC12591197 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature