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Influence of Aluminium and Cadmium Stresses on Mineral Nutrition and Root Exudates in Two Barley Cultivars

Citation

Guo, T and Zhang, G and Zhou, M and Wu, F and Chen, J, Influence of Aluminium and Cadmium Stresses on Mineral Nutrition and Root Exudates in Two Barley Cultivars, Pedosphere, 17, (4) pp. 505-512. ISSN 1002-0160 (2007) [Refereed Article]

DOI: doi:10.1016/S1002-0160(07)60060-5

Abstract

A hydroponic experiment was carried out to study the effect of aluminum (Al) and cadmium (Cd) on Al and mineral nutrient contents in plants and Al-induced organic acid exudation in two barley varieties with different Al tolerance. Al-sensitive cv. Shang 70-119 had significantly higher Al content and accumulation in plants than Al-tolerant cv. Gebeina, especially in roots, when subjected to low pH (4.0) and Al treatments (100 μmol L-1 Al and 100 μmol L-1 Al +1.0 μmol L-1 Cd). Cd addition increased Al content in plants exposed to Al stress. Both low pH and Al treatments caused marked reduction in Ca and Mg contents in all plant parts, P and K contents in the shoots and leaves, Fe, Zn and Mo contents in the leaves, Zn and B contents in the shoots, and Mn contents both in the roots and leaves. Moreover, changes in nutrient concentrations were greater in the plants exposed to both Al and Cd than in those exposed only to Al treatment. A dramatic enhancement of malate, citrate, and succinate was found in the plants exposed to 100 μmol L-1 Al relative to the control, and the Al-tolerant cultivar had a considerable higher exudation of these organic acids than the Al-sensitive one, indicating that Al-induced enhancement of these organic acids is very likely to be associated with Al tolerance. © 2007 Soil Science Society of China.

Item Details

Item Type:Refereed Article
Research Division:Agricultural and Veterinary Sciences
Research Group:Crop and Pasture Production
Research Field:Crop and Pasture Improvement (Selection and Breeding)
Objective Division:Plant Production and Plant Primary Products
Objective Group:Winter Grains and Oilseeds
Objective Field:Barley
Author:Zhou, M (Professor Meixue Zhou)
ID Code:36294
Year Published:2007
Web of Science® Times Cited:24
Deposited By:Agricultural Science
Deposited On:2007-08-01
Last Modified:2009-08-06
Downloads:0

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