AOBPreview originally published online on September 21, 2005
Annals of Botany 2005 96(6):1027-1046; doi:10.1093/aob/mci255
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Phylogenetic Variation in the Silicon Composition of Plants
1 School of Biological and Molecular Sciences, Oxford Brookes University, Headington, Oxford OX3 0BP, UK, 2 Warwick HRI, University of Warwick, Wellesbourne, Warwick CV35 9EF, UK and 3 Plant Sciences Division, School of Biosciences, University of Nottingham, Sutton Bonington, Leicestershire LE12 5RD, UK
* For correspondence. E-mail martin.broadley{at}nottingham.ac.uk
Received: 7 April 2005 Returned for revision: 8 June 2005 Accepted: 13 July 2005 Published electronically: 21 September 2005
• Background and Aims Silicon (Si) in plants provides structural support and improves tolerance to diseases, drought and metal toxicity. Shoot Si concentrations are generally considered to be greater in monocotyledonous than in non-monocot plant species. The phylogenetic variation in the shoot Si concentration of plants reported in the primary literature has been quantified.
• Methods Studies were identified which reported Si concentrations in leaf or non-woody shoot tissues from at least two plant species growing in the same environment. Each study contained at least one species in common with another study.
• Key Results Meta-analysis of the data revealed that, in general, ferns, gymnosperms and angiosperms accumulated less Si in their shoots than non-vascular plant species and horsetails. Within angiosperms and ferns, differences in shoot Si concentration between species grouped by their higher-level phylogenetic position were identified. Within the angiosperms, species from the commelinoid monocot orders Poales and Arecales accumulated substantially more Si in their shoots than species from other monocot clades.
• Conclusions A high shoot Si concentration is not a general feature of monocot species. Information on the phylogenetic variation in shoot Si concentration may provide useful palaeoecological and archaeological information, and inform studies of the biogeochemical cycling of Si and those of the molecular genetics of Si uptake and transport in plants.
Key words: Biogeochemistry, fertilizer, phytoliths, silica, transporter, uptake
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