Document Detail

Variation in root-to-shoot translocation of cadmium and zinc among different accessions of the hyperaccumulators Thlaspi caerulescens and Thlaspi praecox.
MedLine Citation:
PMID:  18266619     Owner:  NLM     Status:  MEDLINE    
Efficient root-to-shoot translocation is a key trait of the zinc/cadmium hyperaccumulators Thlaspi caerulescens and Thlaspi praecox, but the extent of variation among different accessions and the underlying mechanisms remain unclear. Root-to-shoot translocation of Cd and Zn and apoplastic bypass flow were determined in 10 accessions of T. caerulescens and one of T. praecox, using radiolabels (109)Cd and (65)Zn. Two contrasting accessions (Pr and Ga) of T. caerulescens were further characterized for TcHMA4 expression and metal compartmentation in roots. Root-to-shoot translocation of (109)Cd and (65)Zn after 1 d exposure varied 4.4 to 5-fold among the 11 accessions, with a significant correlation between the two metals, but no significant correlation with uptake or the apoplastic bypass flow. The F(2) progeny from a cross between accessions from Prayon, Belgium (Pr) and Ganges, France (Ga) showed a continuous phenotype pattern and transgression. There was no significant difference in the TcHMA4 expression in roots between Pr and Ga. Compartmentation analysis showed a higher percentage of (109)Cd sequestered in the root vacuoles of Ga than Pr, the former being less efficient in translocation than the latter. Substantial natural variation exists in the root-to-shoot translocation of Cd and Zn, and root vacuolar sequestration may be an important factor related to this variation.
J P Xing; R F Jiang; D Ueno; J F Ma; H Schat; S P McGrath; F J Zhao
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-02-05
Journal Detail:
Title:  The New phytologist     Volume:  178     ISSN:  1469-8137     ISO Abbreviation:  New Phytol.     Publication Date:  2008  
Date Detail:
Created Date:  2008-03-28     Completed Date:  2008-05-08     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882884     Medline TA:  New Phytol     Country:  England    
Other Details:
Languages:  eng     Pagination:  315-25     Citation Subset:  IM    
Key Laboratory of Plant-Soil Interactions of the Ministry of Education, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100094, People's Republic of China.
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MeSH Terms
Cadmium / metabolism*
Crosses, Genetic
Gene Expression Regulation, Plant / physiology
Plant Proteins / genetics,  metabolism
Plant Roots / cytology,  metabolism*
Plant Shoots / metabolism*
Thlaspi / classification,  genetics,  metabolism*
Zinc / metabolism*
Grant Support
//Biotechnology and Biological Sciences Research Council
Reg. No./Substance:
0/Plant Proteins; 7440-43-9/Cadmium; 7440-66-6/Zinc

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