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09:43
Breeding by Design for Functional Rice with Genome Editing Technologies
Published on: January 3, 2025
Ontogenetic changes in vitamin C in selected rice varieties
Katherine A Lisko1, John F Hubstenberger, Gregory C Phillips
1Arkansas Biosciences Institute, Arkansas State University, State University, AR 72467, USA.
Plant Physiology and Biochemistry : PPB
|March 8, 2013
Summary
Rice (Oryza sativa) ascorbate metabolism differs from other plants, with vitamin C levels increasing during development. This study reveals potential for enhancing vitamin C in rice through breeding.
Area of Science:
- Plant Physiology
- Biochemistry
- Agricultural Science
Background:
- Vitamin C (L-ascorbic acid) is a crucial antioxidant in plants, vital for photosynthesis, growth, and stress response.
- Ascorbate protects cellular components from oxidative damage caused by reactive oxygen species during abiotic stress.
- Understanding ascorbate regulation is key to improving plant health and crop yield.
Purpose of the Study:
- To investigate ascorbate metabolism in rice (Oryza sativa) throughout plant development.
- To determine the influence of light intensity and photoperiod on rice ascorbate levels.
- To compare ascorbate content across diverse rice genotypes.
Main Methods:
- Quantification of total foliar ascorbate content in rice accessions.
- Analysis of ascorbate levels during different developmental stages (vegetative and reproductive).
- Assessment of ascorbate response to varying light intensities (150–1500 μmol m⁻² s⁻¹) and diurnal cycles.
Main Results:
- Rice ascorbate levels increase with plant development, peaking at vegetative (V2-4) and reproductive (R4) stages, unlike dicots where it declines.
- Ascorbate content in rice showed minimal variation under different light intensities and diurnal cycles.
- Significant genotypic variation (up to eight-fold) in foliar ascorbate was observed among 23 rice accessions at the V2 stage.
Conclusions:
- Rice exhibits a unique ascorbate accumulation pattern during development compared to other plant species.
- Light intensity and photoperiod do not significantly alter ascorbate levels in rice.
- Genetic variability in ascorbate content presents opportunities for breeding enhanced vitamin C rice varieties.
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