A SURVEY OF ALUMINIUM ACCUMULATION IN EUMACHIA (RUBIACEAE)

Q2 Agricultural and Biological Sciences Edinburgh Journal of Botany Pub Date : 2021-03-09 DOI:10.24823/EJB.2021.335

I. Turner, F. Brearley, Liam A. Trethowan, T. Utteridge

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Abstract

A useful character for spotting specimens of the pantropical Rubiaceae genus Eumachia is the leaves drying green. The physiological reasons for this are unresolved. We investigated whether the phenomenon is related to the accumulation of aluminium. Samples of foliage from herbarium specimens of nine species of Eumachia (Rubiaceae), including collections from Asia-Pacific, Africa and the Americas, were analysed for elemental concentrations. For comparison, specimens of the closely related genera Psychotria and Palicourea from similar geographical regions were also analysed. Two species, Palicourea violacea (Panama) and Psychotria pallens (Brazil) were found to be aluminium hyperaccumulators (≥ 1% Al by dry weight), with a third species, Eumachia collina (from New Caledonia), falling just short of the threshold with 0.99% Al. Aluminium accumulation (≥ 0.4% Al by dry weight) occurs but is infrequent among species of Eumachia and appears lesscommon than in the close relative Palicourea. Aluminium accumulation also appears patchy in Psychotria sensu stricto. It seems unlikely that herbarium greenness in Eumachia is directly related to aluminium accumulation.

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金合欢属（茜草科）铝积累调查

泛热带茜草科Eumachia属植物的一个有用特征是干燥的绿色叶子。造成这种情况的生理原因尚未解决。我们调查了这种现象是否与铝的积累有关。分析了九种茜草科植物标本馆的树叶样本中的元素浓度，这些标本包括亚太、非洲和美洲的标本。为了进行比较，还分析了来自相似地理区域的亲缘关系密切的Psychtria属和Palicorea属的标本。两个物种，Palicourea violacea（巴拿马）和Psychotria pallens（巴西）被发现是铝的超积累植物（按干重计Al≥1%），第三个物种，Eumachia collina（来自新喀里多尼亚），低于0.99%Al的阈值。铝积累（按干重计，≥0.4%的铝）发生，但在Eumachia物种中并不常见，而且似乎不如近亲Palicorea常见。在严格意义上的精神病患者中，铝的积累也呈斑片状。Eumachia植物标本馆的绿色似乎不太可能与铝的积累直接相关。

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Edinburgh Journal of Botany Agricultural and Biological Sciences-Plant Science

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期刊介绍： Edinburgh Journal of Botany is an international journal of plant systematics covering related aspects of biodiversity, conservation science and phytogeography for plants and fungi. The journal is a particularly valued forum for research on South East and South West Asian, Sino-Himalayan and Brazilian biodiversity. The journal also publishes important work on European, Central American and African biodiversity and encourages submissions from throughout the world. Commissioned book reviews are also included. All papers are peer reviewed and an international editorial board provides a body of expertise to reflect the wide range of work published and the geographical spread of the journal’s authors and readers. Published on behalf of the Royal Botanic Garden Edinburgh