Abstract
We investigated the significance of phenolic compounds in roots and root exudates in relation to resistance to Al of woody plants differing in plant age. Aluminium resistance of younger and older woody plants followed the sequence : Camellia sinensis > Picea abies > Gleditsia triacanthos. The contents of soluble phenolic compounds in roots were in the following order regardless of plant age and treatment with or without Al: C. sinensis > P. abies >> G. triacanthos. The values were positively related to Al resistance. Exuded phenolics however, did not correlate with Al resistance at either stage of plant growth. Older woody plants were more tolerant of Al than younger ones and soluble phenolic compounds in older Altolerant woody plants were significantly higher than those in younger plants. It is suggested that soluble phenolic compounds are constitutively involved in detoxifying the cytoplasm of Al (Ofei-Manu et al., 2001). Higher concentrations of soluble phenolic compounds in older Al-tolerant woody plants at least partially explained the higher Al tolerance than in younger woody plants.
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