Accumulation patterns of anthocyanin and γ-oryzanol during black rice grain development.

Autor: Thapa M; Faculty of Science and Engineering, Southern Cross University, Lismore, New South Wales, Australia., Liu L; Faculty of Science and Engineering, Southern Cross University, Lismore, New South Wales, Australia., Barkla BJ; Faculty of Science and Engineering, Southern Cross University, Lismore, New South Wales, Australia., Kretzschmar T; Faculty of Science and Engineering, Southern Cross University, Lismore, New South Wales, Australia., Rogiers SY; NSW Department of Primary Industries, Wollongbar, New South Wales, Australia., Rose TJ; Faculty of Science and Engineering, Southern Cross University, Lismore, New South Wales, Australia.; Centre for Organics Research, Southern Cross University, Lismore, New South Wales, Australia.
Jazyk: angličtina
Zdroj: PloS one [PLoS One] 2024 May 22; Vol. 19 (5), pp. e0302745. Date of Electronic Publication: 2024 May 22 (Print Publication: 2024).
DOI: 10.1371/journal.pone.0302745
Abstrakt: Pigmented rice, especially black rice, is gaining popularity as it is rich in antioxidants such as anthocyanins and γ-oryzanol. At present, knowledge about temporal control of biosynthesis and accumulation of antioxidants during grain development is limited. To address this, the accumulation patterns of anthocyanins and γ-oryzanol were assessed in two distinct black rice genotypes over the course of grain development, and the expression of known regulatory genes for anthocyanin biosynthesis was examined. The results indicated that total γ-oryzanol content increased continuously throughout grain development, while total anthocyanins peaked at dough stage (15 to 21 days after flowering) followed by a decline until grain maturity in both genotypes. However, the rate of decrease in anthocyanin content differed between genotypes, and a more prominent decline in cyanidin 3-O-glucoside (C3G) relative to peonidin 3-O-glucoside (P3G) was observed for both. Anthocyanin content was closely linked with the expression of key regulatory genes in the MBW (MYB-bHLH-WD40) complex. This improved knowledge of the genotype-specific biosynthesis (anthocyanins only) and accumulation patterns of anthocyanins and γ-oryzanol can inform subsequent research efforts to increase concentrations of these key antioxidants in black rice grains.
Competing Interests: The authors have declared that no competing interests exist
(Copyright: © 2024 Thapa et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)
Databáze: MEDLINE
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