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Cd accumulation in roots and shoots of durum wheat: the roles of transpiration rate and apoplastic bypass.
J Exp Bot. 2007; 58(11):2939-47.JE

Abstract

Cadmium is readily taken up from soils by plants, depending on soil chemistry, and variably among species and cultivars; altered transpiration and xylem transport and/or translocation in the phloem could cause this variation in Cd accumulation, some degree of which is heritable. Using Triticum turgidum var. durum cvs Kyle and Arcola (high and low grain Cd accumulating, respectively), the objectives of this study were to determine if low-concentration Cd exposure alters transpiration, to relate transpiration to accumulation of Cd in roots and shoots at several life stages, and to evaluate the role of apoplastic bypass in the accumulation of Cd in shoots. The low abundance isotope (106)Cd was used to probe Cd translocation in plants which had been exposed to elemental Cd or were Cd-naïve; apoplastic bypass was monitored using the fluorescent dye PTS (8-hydroxy-1,3,6-pyrenetrisulphonate). Differential accumulation of Cd by 'Kyle' and 'Arcola' could be partially attributed to the effect of Cd on transpiration, as exposure to low concentrations of Cd increased mass flow and concomitant Cd accumulation in 'Kyle'. Distinct from this, exposure of 'Arcola' to low concentrations of Cd reduced translocation of Cd from roots to shoots relative to root accumulation of Cd. It is possible, but not tested here, that sequestration mechanisms (such as phytochelatin production, as demonstrated by others) are the genetically controlled difference between these two cultivars that results in differential Cd accumulation. These results also suggest that apoplastic bypass was not a major pathway of Cd transport from the root to the shoot in these plants, and that most of the shoot Cd resulted from uptake into the stele of the root via the symplastic pathway.

Authors+Show Affiliations

Department of Land Resource Science, University of Guelph, Guelph, ON, Canada.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17804431

Citation

Van der Vliet, Leana, et al. "Cd Accumulation in Roots and Shoots of Durum Wheat: the Roles of Transpiration Rate and Apoplastic Bypass." Journal of Experimental Botany, vol. 58, no. 11, 2007, pp. 2939-47.
Van der Vliet L, Peterson C, Hale B. Cd accumulation in roots and shoots of durum wheat: the roles of transpiration rate and apoplastic bypass. J Exp Bot. 2007;58(11):2939-47.
Van der Vliet, L., Peterson, C., & Hale, B. (2007). Cd accumulation in roots and shoots of durum wheat: the roles of transpiration rate and apoplastic bypass. Journal of Experimental Botany, 58(11), 2939-47.
Van der Vliet L, Peterson C, Hale B. Cd Accumulation in Roots and Shoots of Durum Wheat: the Roles of Transpiration Rate and Apoplastic Bypass. J Exp Bot. 2007;58(11):2939-47. PubMed PMID: 17804431.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Cd accumulation in roots and shoots of durum wheat: the roles of transpiration rate and apoplastic bypass. AU - Van der Vliet,Leana, AU - Peterson,Carol, AU - Hale,Beverley, Y1 - 2007/09/04/ PY - 2007/9/7/pubmed PY - 2008/1/30/medline PY - 2007/9/7/entrez SP - 2939 EP - 47 JF - Journal of experimental botany JO - J Exp Bot VL - 58 IS - 11 N2 - Cadmium is readily taken up from soils by plants, depending on soil chemistry, and variably among species and cultivars; altered transpiration and xylem transport and/or translocation in the phloem could cause this variation in Cd accumulation, some degree of which is heritable. Using Triticum turgidum var. durum cvs Kyle and Arcola (high and low grain Cd accumulating, respectively), the objectives of this study were to determine if low-concentration Cd exposure alters transpiration, to relate transpiration to accumulation of Cd in roots and shoots at several life stages, and to evaluate the role of apoplastic bypass in the accumulation of Cd in shoots. The low abundance isotope (106)Cd was used to probe Cd translocation in plants which had been exposed to elemental Cd or were Cd-naïve; apoplastic bypass was monitored using the fluorescent dye PTS (8-hydroxy-1,3,6-pyrenetrisulphonate). Differential accumulation of Cd by 'Kyle' and 'Arcola' could be partially attributed to the effect of Cd on transpiration, as exposure to low concentrations of Cd increased mass flow and concomitant Cd accumulation in 'Kyle'. Distinct from this, exposure of 'Arcola' to low concentrations of Cd reduced translocation of Cd from roots to shoots relative to root accumulation of Cd. It is possible, but not tested here, that sequestration mechanisms (such as phytochelatin production, as demonstrated by others) are the genetically controlled difference between these two cultivars that results in differential Cd accumulation. These results also suggest that apoplastic bypass was not a major pathway of Cd transport from the root to the shoot in these plants, and that most of the shoot Cd resulted from uptake into the stele of the root via the symplastic pathway. SN - 0022-0957 UR - https://www.unboundmedicine.com/medline/citation/17804431/Cd_accumulation_in_roots_and_shoots_of_durum_wheat:_the_roles_of_transpiration_rate_and_apoplastic_bypass_ L2 - https://academic.oup.com/jxb/article-lookup/doi/10.1093/jxb/erm119 DB - PRIME DP - Unbound Medicine ER -