Journal Article

Effects of Lanthanum and Cerium on the Growth and Mineral Nutrition of Corn and Mungbean

Eugene Diatloff, Frank W. Smith and Colin J. Asher

in Annals of Botany

Published on behalf of The Annals of Botany Company

Volume 101, issue 7, pages 971-982
Published in print May 2008 | ISSN: 0305-7364
Published online February 2008 | e-ISSN: 1095-8290 | DOI: http://dx.doi.org/10.1093/aob/mcn021
Effects of Lanthanum and Cerium on the Growth and Mineral Nutrition of Corn and Mungbean

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Background and Aims

Plant growth responses to the rare earth elements lanthanum (La) and cerium (Ce) have been reported, but little is known about the effects of these two elements on plant mineral nutrition.

Methods

Corn (Zea mays ‘Hycorn 82’) and mungbean (Vigna radiata ‘Berken’) were grown in continuous flowing nutrient solutions containing 0, 0·2, 1·0 and 5·0 µm La or Ce. At harvest plants were divided into roots and shoots, dried, weighed and analysed for macro- and micronutrients, as well as for La and Ce.

Key Results

La and Ce did not increase the growth of corn or mungbean. The dry weight of corn shoots was decreased by 32 % in the presence of 5·0 µm Ce; the other La and Ce concentrations had no effect. La and Ce concentrations of 0·9 and 5·0 µm decreased the shoot dry weight of mungbean by 75 or 95 %, the two elements having closely similar effects. Decreases in the uptake of Ca, Na, Zn and Mn by corn were observed with increases in solution La and Ce. For mungbean, the uptake rates of all measured elements decreased with increases in solution La and Ce. The concentrations of La and Ce in the roots of both species were higher than in the shoots and increased strongly with increasing concentrations of La or Ce in solution. The La and Ce concentrations in mungbean shoots were always higher than in corn shoots.

Conclusions

La and Ce did not enhance the growth of corn or mungbean, but decreased the growth, root function and consequently the nutritional status of mungbean at concentrations >0·2 µm in solution. It is concluded that if La or Ce have positive effects on corn and mungbean growth, they can only occur at solution concentrations below 0·2 µm.

Keywords: Cerium; corn; Zea mays; lanthanum; mineral nutrition; mungbean; Vigna radiata; plant growth; rare earth elements

Journal Article.  7493 words.  Illustrated.

Subjects: Ecology and Conservation ; Evolutionary Biology ; Plant Sciences and Forestry

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