Uptake and partitioning of cadmium by cultivars of peanut (Arachis hypogaea L.)

McLaughlin, M J and Bell, M.J. and Wright, G.C. and Cozens, G.D. (2000) Uptake and partitioning of cadmium by cultivars of peanut (Arachis hypogaea L.). Plant and Soil, 222 (1-2). pp. 51-58.

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Cadmium has been found to accumulate in groundnut kernels to levels exceeding the current maximum permitted concentration in Australia of 0.1 mg kg-1. Experiments were conducted to determine if Cd is absorbed directly through the pod wall or via the main root system, and if differences exist between cultivars in this respect. Split-pot soil and sand/nutrient solution experiments were performed with two cultivars of groundnut (cv. NC7 and cv. Streeton) known to accumulate Cd to different levels in the kernel. The growth medium was separated into pod and root zones with Cd concentrations in each zone varied. In confirmation of previous field trial results, cv. NC7 had higher concentrations of Cd in kernels, given the same Cd levels in the external medium (solution or soil). Despite total Cd uptake by cv. NC7 being similar to cv. Streeton, cv. NC7 appeared to retain more Cd in the roots and translocate less Cd to shoots. Results from both soil and sand/solution culture indicated that the dominant path of Cd uptake by groundnut was via the main root system, with direct pod uptake contributing less than 5% of the total Cd in the kernel. There was little difference between cultivars in this characteristic. This indicates that unlike Ca nutrition of groundnuts, agronomic techniques to manage Cd uptake will require modification of soil to the full depth of root exploration, rather than just the surface strata where pods develop. Cadmium concentrations in testa were up to an order of magnitude higher than in the kernel, indicating that blanching of kernels would be effective in reducing Cd in the marketed product.

Item Type: Article
Additional Information: SNNigam Collection
Uncontrolled Keywords: Cadmium, Arachis hypogaea, genotypic variation, split pot, translocation.
Author Affiliation: CSIRO Land and Water, Glen Osmond, South Australia, Australia.
Subjects: Plant Production
Crop Improvement
Divisions: Groundnut
Depositing User: Mr Balakrishna Garadasu
Date Deposited: 03 Apr 2013 14:13
Last Modified: 03 Apr 2013 14:13
Official URL: http://dx.doi.org/10.1023/A:1004771712840
URI: http://eprints.icrisat.ac.in/id/eprint/10144

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