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Characterization of 68Zn uptake, translocation, and accumulation into developing grains and young leaves of high Zn-density rice genotype
- Source :
- Journal of Zhejiang University SCIENCE B. 12:408-418
- Publication Year :
- 2011
- Publisher :
- Zhejiang University Press, 2011.
-
Abstract
- Zinc (Zn) is an essential micronutrient for humans, but Zn deficiency has become serious as equally as iron (Fe) and vitamin A deficiencies nowadays. Selection and breeding of high Zn-density crops is a suitable, cost-effective, and sustainable way to improve human health. However, the mechanism of high Zn density in rice grain is not fully understood, especially how Zn transports from soil to grains. Hydroponics experiments were carried out to compare Zn uptake and distribution in two different Zn-density rice genotypes using stable isotope technique. At seedling stage, IR68144 showed higher (68)Zn uptake and transport rate to the shoot for the short-term, but no significant difference was observed in both genotypes for the long-term. Zn in xylem sap of IR68144 was consistently higher, and IR68144 exhibited higher Zn absorption ratio than IR64 at sufficient (2.0 µmol/L) or surplus (8.0 µmol/L) Zn supply level. IR64 and IR68144 showed similar patterns of (68)Zn accumulation in new leaves at seedling stage and in developing grains at ripening stage, whereas (68)Zn in new leaves and grains of IR68144 was consistently higher. These results suggested that a rapid root-to-shoot translocation and enhanced xylem loading capacity may be the crucial processes for high Zn density in rice grains.
- Subjects :
- Biofortification
Biological Transport, Active
chemistry.chemical_element
Zinc
Plant Roots
General Biochemistry, Genetics and Molecular Biology
Hydroponics
Species Specificity
Xylem
Humans
Plant breeding
General Pharmacology, Toxicology and Pharmaceutics
Oryza sativa
General Veterinary
biology
food and beverages
Oryza
General Medicine
biology.organism_classification
Plant Leaves
Agronomy
chemistry
Seedlings
Seedling
Shoot
Zinc Isotopes
Edible Grain
Plant Shoots
Biotechnology
Subjects
Details
- ISSN :
- 18621783 and 16731581
- Volume :
- 12
- Database :
- OpenAIRE
- Journal :
- Journal of Zhejiang University SCIENCE B
- Accession number :
- edsair.doi.dedup.....3c8fb84e29c4384ae1706d7b11eb54c5
- Full Text :
- https://doi.org/10.1631/jzus.b1000291