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Soil selenium uptake and root system development in plant taxa differing in Se‐accumulating capability
Author(s) -
Goodson Christopher C.,
Parker David R.,
Amrhein Christopher,
Zhang Yiqiang
Publication year - 2003
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1046/j.1469-8137.2003.00781.x
Subject(s) - hyperaccumulator , phytoremediation , soil water , selenium , brassica , ecotype , botany , shoot , biology , agronomy , chemistry , ecology , organic chemistry
Summary• Phytoremediation of Se‐contaminated soils and sediments may be more feasible if accumulating taxa are identified that can extract the more refractory forms of Se. • In a glasshouse study, the capacity of six plant genotypes to take up labile and nonlabile soil Se was evaluated by amending five high‐Se soils (2–21 mg kg −1 total Se) with carrier‐free 75 Se, and cropping them with Astragalus bisulcatus , Astragalus canadensis , Brassica juncea , Sporobolus airoides , and two ecotypes of Stanleya pinnata . • The biologically labile pool of soil Se ( L ‐value) was computed from the isotopic signature of the harvested shoots, and ranged from 2 to 37% of the total soil Se. The chemically labile pool ( E ‐value) was determined via extraction in 0.1 m KCl, and ranged from 4 to 73% of total soil Se. None of the plants tested yielded L ‐values that were consistently greater than the E ‐values, suggesting that all plants, including Se hyperaccumulators, access the same labile pools of Se. • Root‐growth experiments in rhizoboxes using Se‐enriched soil were also performed. Although our observations were not as striking as those made for the Zn(Cd)‐accumulator Thlaspi caerulescens , the tendency for roots of some Se‐accumulators to proliferate in soil where Se is present deserves further investigation.