Selenium Uptake in Astragalus and Lupinus Species
1986
Davis, A. M.
Forage quality potentials of plant introductions are unknown when introduced into the USA. Some native species of Astrugulus are known to be Selenium (Se) accumulators and it is possible that some introductions could be accumulators also. This greenhouse study was undertaken to determine which, if any, of the untested 103 Astrugulus and 68 Lupinus accessions were Se accumulators. Each accession was present in four replicates arranged in a randomized complete block design. Accessions were harvested at 24 weeks of age and the forage dried and analyzed. The AOAC extraction procedures were used and quantification was by colormetric turbidometric methods. Species of Astrugulus accumulated Se in varying amounts from none to 61 mg kg⁻¹. None of the species of Lupinus accumulated Se at a potentially toxic level when grown in a soil mix (equal parts v/v: Shamel loam/quartz sand/commercial peat), that contained 18 mg kg⁻¹ Se. These studies indicate that plants from 66 of the 103 Astrugulus and none of the 68 Lupinus accessions might accumulate toxic amounts of Se if grown on seleniferous soils. However, other unknown factors may make them unsuited for forage.
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