Abstract
The mechanism responsible for Al resistance in Cassia tora L., an Al-resistant species, was investigated by comparison with Cassia occidentalis L., an Al-sensitive species, in terms of secretion of citric acid. Intermittent treatment with 0–50 μM Al for 10 d hardly affected shoot and root growth of C. tora, while 50 μM Al decreased root growth of C. occidentalis by about 25%. The amount of citric acid secreted increased with increasing external Al concentrations in both species. However, C. tora secreted 2.5 to 3.0 times more citric acid than did C. occidentalis at each Al concentration. Several organic acids were detected in the roots of C. tora, but only citric acid was secreted in response to Al. The secretion of citric acid ceased after removal of Al, but was induced again by re-exposure to Al. We suggest that the specific secretion of citric acid is one of the mechanisms responsible for Al resistance in C. tora.
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© 1997 Kluwer Academic Publishers
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Ma, J.F., Zheng, S.J., Matsumoto, H. (1997). Secretion of citric acid as an aluminium-resistant mechanism in Cassia tora L.. In: Ando, T., Fujita, K., Mae, T., Matsumoto, H., Mori, S., Sekiya, J. (eds) Plant Nutrition for Sustainable Food Production and Environment. Developments in Plant and Soil Sciences, vol 78. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0047-9_136
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DOI: https://doi.org/10.1007/978-94-009-0047-9_136
Publisher Name: Springer, Dordrecht
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