Pedosphere 17(4): 505--512, 2007
ISSN 1002-0160/CN 32-1315/P
©2007 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Influence of aluminum and cadmium stresses on mineral nutrition and root exudates in two barley cultivars
GUO Tian-Rong1,3, ZHANG Guo-Ping1, ZHOU Mei-Xue2, WU Fei-Bo1 and CHEN Jin-Xin1
1 Agronomy Department, Zhejiang University, Huajiachi Campus, Hangzhou 310029 (China). E-mail:
2 University of Tasmania, Tasmanian Institute of Agricultural Research, Kings Meadows, Tasmania 7249 (Australia)
3 College of Life Science, Shaoxing University, Shaoxing 312000 (China)
      A hydroponic experiment was carried out to study the effect of aluminum (A1) and cadmium (Cd) on AI and mineral nutrient contents in plants and Al-induced organic acid exudation in two barley varieties with different Al tolerance. Alsensitive 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 (100μmol L-1 Al and 100μmol L-1 Al+1.0μmol L-1 Cd). Cd addition increased A1 content in plants exposed to A1 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 100μmol 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.
Key Words:  aluminum, barley(Hordeum vulgare L.), cadmium, nutrient content, organic acids
Citation: Guo, T. R., Zhang, G. P., Zhou, M. X., Wu, F. B. and Chen, J. X. 2007. Influence of aluminum and cadmium stresses on mineral nutrition and root exudates in two barley cultivars. Pedosphere. 17(4): 505-512.
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