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Reduced translocation of cadmium from roots is associated with increased production of phytochelatins and their precursors.
J Plant Physiol. 2012 Dec 15; 169(18):1821-9.JP

Abstract

Cadmium (Cd) is a non-essential trace element and its environmental concentrations are approaching toxic levels, especially in some agricultural soils. Understanding how and where Cd is stored in plants is important for ensuring food safety. In this study, we examined two plant species that differ in the distribution of Cd among roots and leaves. Lettuce and barley were grown in nutrient solution under two conditions: chronic (4 weeks) exposure to a low, environmentally relevant concentration (1.0 μM) of Cd and acute (1 h) exposure to a high concentration (5.0 mM) of Cd. Seedlings grown in solution containing 1.0 μM CdCl₂ did not show symptoms of toxicity and, at this concentration, 77% of the total Cd was translocated to leaves of lettuce, whereas only 24% of the total Cd was translocated to barley leaves. We tested the hypothesis that differential accumulation of Cd in roots and leaves is related to differential concentrations of phytochelatins (PCs), and its precursor peptides. The amounts of PCs and their precursor peptides in the roots and shoots were measured using HPLC. Each of PC₂₋₄ was synthesized in the barley root upon chronic exposure to Cd and did not increase further upon acute exposure. In the case of lettuce, no PCs were detected in the root given either Cd treatment. The high amounts of PCs produced in barley root could have contributed to preferential retention of Cd in barley roots.

Authors+Show Affiliations

Department of Biology, Western University, London, ON N6A 5B7, Canada.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

22922170

Citation

Akhter, Fardausi, et al. "Reduced Translocation of Cadmium From Roots Is Associated With Increased Production of Phytochelatins and Their Precursors." Journal of Plant Physiology, vol. 169, no. 18, 2012, pp. 1821-9.
Akhter F, McGarvey B, Macfie SM. Reduced translocation of cadmium from roots is associated with increased production of phytochelatins and their precursors. J Plant Physiol. 2012;169(18):1821-9.
Akhter, F., McGarvey, B., & Macfie, S. M. (2012). Reduced translocation of cadmium from roots is associated with increased production of phytochelatins and their precursors. Journal of Plant Physiology, 169(18), 1821-9. https://doi.org/10.1016/j.jplph.2012.07.011
Akhter F, McGarvey B, Macfie SM. Reduced Translocation of Cadmium From Roots Is Associated With Increased Production of Phytochelatins and Their Precursors. J Plant Physiol. 2012 Dec 15;169(18):1821-9. PubMed PMID: 22922170.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Reduced translocation of cadmium from roots is associated with increased production of phytochelatins and their precursors. AU - Akhter,Fardausi, AU - McGarvey,Brian, AU - Macfie,Sheila M, Y1 - 2012/08/22/ PY - 2012/05/18/received PY - 2012/07/31/revised PY - 2012/07/31/accepted PY - 2012/8/28/entrez PY - 2012/8/28/pubmed PY - 2013/4/20/medline SP - 1821 EP - 9 JF - Journal of plant physiology JO - J Plant Physiol VL - 169 IS - 18 N2 - Cadmium (Cd) is a non-essential trace element and its environmental concentrations are approaching toxic levels, especially in some agricultural soils. Understanding how and where Cd is stored in plants is important for ensuring food safety. In this study, we examined two plant species that differ in the distribution of Cd among roots and leaves. Lettuce and barley were grown in nutrient solution under two conditions: chronic (4 weeks) exposure to a low, environmentally relevant concentration (1.0 μM) of Cd and acute (1 h) exposure to a high concentration (5.0 mM) of Cd. Seedlings grown in solution containing 1.0 μM CdCl₂ did not show symptoms of toxicity and, at this concentration, 77% of the total Cd was translocated to leaves of lettuce, whereas only 24% of the total Cd was translocated to barley leaves. We tested the hypothesis that differential accumulation of Cd in roots and leaves is related to differential concentrations of phytochelatins (PCs), and its precursor peptides. The amounts of PCs and their precursor peptides in the roots and shoots were measured using HPLC. Each of PC₂₋₄ was synthesized in the barley root upon chronic exposure to Cd and did not increase further upon acute exposure. In the case of lettuce, no PCs were detected in the root given either Cd treatment. The high amounts of PCs produced in barley root could have contributed to preferential retention of Cd in barley roots. SN - 1618-1328 UR - https://www.unboundmedicine.com/medline/citation/22922170/Reduced_translocation_of_cadmium_from_roots_is_associated_with_increased_production_of_phytochelatins_and_their_precursors_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0176-1617(12)00319-7 DB - PRIME DP - Unbound Medicine ER -