Effect of aluminum on cell wall, plasma membrane, antioxidants and root elongation in triticale
Liu, Q.,Zhejiang Univ., Hangzhou (China). Coll. of Environmental and Resource Sciences | Yang, J.L.,Zhejiang Univ., Hangzhou (China). Coll. of Environmental and Resource Sciences | He, L.S.,Zhejiang Univ., Hangzhou (China). Coll. of Environmental and Resource Sciences | Li, Y.Y.,Zhejiang Univ., Hangzhou (China). Coll. of Environmental and Resource Sciences | Zheng, S.J.,Zhejiang Univ., Hangzhou (China). State Key Lab. of Plant Physiology and Biochemistry
Two triticale cultivars ZC 237 (Al-resistant) and ZC 1890 (Al-sensitive) were used to investigate the effects of 30 to 100 microM Al on antioxidative enzyme activity, lipid peroxidation and cell wall composition. In ZC 1890, the root elongation was significantly inhibited after 1-h exposure to 50 microM Al, the changes in hemicellulose fraction were clearly detected after 2-h Al exposure, while the peroxidase (POD) and superoxide dismutase (SOD) activities significantly increased after 6-h exposure, and the malondialdehyde (MDA) content after 12-h exposure. The similar patterns were also found in ZC 237. Treatment of ZC 1890 with 1 mM citrate for 30 min after 3-h exposure to Al resulted in significant decrease of Al bound to cell-wall and recovery of root elongation. These results suggested that Al affected cell wall before the damage of plasma membrane, but this was not the primary cause of root elongation inhibition.
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