ISSN:
1573-5036
Keywords:
aluminium toxicity
;
Arachis hypogaea L.
;
Bradyrhizobium
;
calcium
;
magnesium
;
solution culture
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Abstract While considerable information has been presented recently on the alleviating effects of calcium (Ca) on aluminium (Al) toxicity, the interaction between Ca and Al on nodulation and N2-fixation of legumes is little understood. A 28 d solution culture experiment using groundnut (Arachis hypogaea L.) cv. Matjam was conducted to evaluate the effects of four Ca concentrations and four Al levels on nodule development, N2-fixation and plant growth. The Ca concentrations were maintained at 500, 1000, 2500 or 5000 μM, and the sum of activities of monomeric Al species (ΣaAlmono) were 0, 15, 30 and 60 μM. With ΣaAlmono≥30 μM in solution, the time to appearance of the first nodule increased, and, with 60 μM ΣaAlmono in solution, plants remained chlorotic throughout the experiment. Activities≥30 μM reduced nodule number and nodule dry mass per plant, particularly with high (5000 μM) Ca in solution. Also, plant top growth was decreased at ΣaAlmono≥30 μM; the effect only being alleviated by 1000 μM Ca at 30 μM ΣaAlmono. The Ca concentration in the youngest expanded leaf (YEL) increased with increased Ca concentration in solution, but was little affected by Al treatment. Nitrogen concentrations mirrored treatment effects on nodule number and nodule dry mass; Al in solution decreased the N concentration particularly with 5000 μM Ca in solution. Furthermore, increased Ca and Al in solution decreased the Mg concentration in the YEL. This suggested that the absence of any alleviating effect of Ca and Al toxicity (indeed the opposite effect was often observed) resulted from interference in Mg nutrition.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00012885
Permalink
