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标题：Exudation of fumarate from roots contributes to high aluminum resistance in Melaleuca cajuputi
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作者：Akira Noguchi ; Yoshifumi Houman ; Fumie Shinmachi 等
期刊名称：Plant Root
电子版ISSN：1881-6754
出版年度：2015
卷号：9
页码：15-23
DOI：10.3117/plantroot.9.15
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.
关键词：aluminum;fumarate;Melaleuca cajuputi;Melaleuca bracteata;resistance, sensitivity