Root-to-shoot Cd translocation via the xylem is the major process determining shoot and grain cadmium accumulation in rice
Open accessAbstract
Physiological properties involved in divergent cadmium (Cd) accumulation among rice genotypes were characterized using the indica cultivar 'Habataki' (high Cd in grains) and the japonica cultivar 'Sasanishiki' (low Cd in grains). Time-dependence and concentration-dependence of symplastic Cd absorption in roots were revealed not to be responsible for the different Cd accumulation between the two cultivars because root Cd uptake was not greater in the Cd-accumulating cultivar 'Habataki' compared with 'Sasanishiki'. On the other hand, rapid and greater root-to-shoot Cd translocation was observed in 'Habataki', which could be mediated by higher abilities in xylem loading of Cd and transpiration rate as a driving force. To verify whether different abilities in xylem-mediated shoot-to-root translocation generally account for the genotypic variation in shoot Cd accumulation in rice, the world rice core collection, consisting of 69 accessions which covers the genetic diversity of almost 32,000 accessions of cultivated rice, was used. The results showed strong correlation between Cd levels in xylem sap and shoots and grains among the 69 rice accessions. Overall, the results presented in this study revealed that the root-to-shoot Cd translocation via the xylem is the major and common physiological process determining the Cd accumulation level in shoots and grains of rice plants.
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Within plant cells, metal cations are bound to chelatins, and chelatin synthesis pathway genes and their transporters play critical roles in metal cation uptake.
“Within plant cells, metal cations are bound to chelatins, chelatin synthesis pathway genes, and their transporters also play critical roles for uptake of metal cations [34].”
From Enhanced tolerance of industrial hemp (Cannabis sativa L.) plants on abandoned mine land soil leads to overexpression of cannabinoids (2019) · cites this paper as [34]
The Introduction (page unavailable) says that transporters for essential metals such as Zn²⁺ and Fe²⁺ can mediate cadmium uptake in roots. It does not address metal cations binding to chelatins inside cells or a role for chelatin-synthesis pathway genes in uptake; searches for chelatins, chelation, and synthesis genes found no supporting passage. (LLM, conf=0.86)
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- Authors
- Uraguchi, S., Mori, S., Kuramata, M., Kawasaki, A., Arao, T., & Ishikawa, S.
- Affiliations
- National Institute for Agro-Environmental Sciences (JP)
- Venue
- Journal of Experimental Botany
- Publisher
- Oxford University Press (OUP)
- Published
- 2009-04-28
- Volume
- 60
- Issue
- 9
- Pages
- 2677-2688
- ISSN
- 0022-0957 (ISSN-L)
- 1460-2431
- PMC
- PMC2692013
- OpenAlex
- W2140589960
- Cited by
- 666
- References
- 2
- Citations by year
- 2026: 23 · 2025: 31 · 2024: 48 · 2023: 49 · 2022: 55 · 2021: 68 · 2020: 46 · 2019: 59 · 2018: 50 · 2017: 40 · 2016: 41 · 2015: 27 · 2014: 27 · 2013: 29 · 2012: 30
- FWCI
- 24.29
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- cc-by-nc
- Locations
- Journal of Experimental Botany (publishedVersion, cc-by-nc)
- PubMed Central (publishedVersion, cc-by-nc)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Environmental Science › Pollution › Heavy metals in environment
- Physical Sciences › Chemistry › Analytical Chemistry › Heavy Metals in Plants
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Micronutrient Interactions and Effects
- Keywords
- cadmium accumulation, rice, root-to-shoot translocation, xylem loading, xylem sap, grain cadmium, transpiration rate, genotypic variation, Sasanishiki, heavy metal transport
- MeSH terms
- Biological Transport, Cadmium, Edible Grain, Oryza, Plant Roots, Plant Shoots, Xylem
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