Aluminum-Induced Lipid Peroxidation and Lignin Deposition Are Associated with an Increase in H2O2Generation in Wheat Seedlings

Autor: Hiroyuki Koyama, A. K. M. Zakir Hossain, Tomonori Kihara, M. Alamgir Hossain, Tetsuo Hara
Rok vydání: 2005
Předmět:
Zdroj: Soil Science and Plant Nutrition. 51:223-230
ISSN: 1747-0765
0038-0768
DOI: 10.1111/j.1747-0765.2005.tb00026.x
Popis: Wheat (Triticum aestivum cv. Kalyansona) seedlings were exposed to 0, 10, 50, and 100 μM Al in a 250 μM CaCl2 solution for 24 h at pH 4.5. Root elongation decreased gradually, while the Al content markedly increased with increasing supply of Al in the solution. The generation of H2O2 during Al stress was investigated biochemically and histochemically, as well as other events related to the decomposition of H2O2. After 24 h treatment, root elongation inhibition was detected at all the concentrations of Al. The level of lipid peroxidation at 10 μM Al after 24 h treatment was similar to that of the control, while a significant increase in lipid peroxidation was detected at 50 and 100 μM Al. H2O2 generation was higher at 50 and 100 μM Al than that at 10 μM Al. These results suggest that Al-inducible lipid peroxidation may require excessive yield of H2O2. Time course experiment with 10 μM Al indicated that there is a strongly positive correlation between root elongation inhibition and cellular H2O2 yield. Ther...
Databáze: OpenAIRE
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