出版社：Japan Science and Technology Information Aggregator, Electronic
摘要：Two Melaleuca species, M. cajuputi and M. bracteata , were compared to identify the factors determining their distinct aluminum (Al) resistance levels. The presence of Al in a liquid culture medium (maximum tested concentration, 2 mM) did not affect the growth of M. cajuputi , but severely inhibited the growth of M. bracteata . The Al content in the roots was 50% higher in Al-sensitive M. bracteata than in Al-resistant M. cajuputi . Al penetration and tissue damage were obvious in the roots of M. bracteata , but only mild in the roots of M. cajuputi . Relatively high levels of fumarate were released by the roots of M. cajuputi , but not by those of M. bracteata . Supplementation of Al-containing liquid media with fumarate resulted in a reduction of Al toxicity on M. bracteata . These results suggest that Al-resistant M. cajuputi releases fumarate from its roots, thereby detoxifying Al.
