Does aridity influence the morphology, distribution and accumulation of calcium oxalate crystals in Acacia (Leguminosae: Mimosoideae)?

被引:34
作者
Brown, Sharon L. [1 ]
Warwick, Nigel W. M. [1 ]
Prychid, Christina J. [1 ,2 ]
机构
[1] Univ New England, Sch Environm & Rural Sci, Armidale, NSW 2351, Australia
[2] Royal Bot Gardens, Richmond TW9 3AB, Surrey, England
关键词
Calcium oxalate; Acacia; Phyllodes; Prismatic crystals; Rosanoffian crystals; Venation architecture; Rainfall; EVOLUTION;
D O I
10.1016/j.plaphy.2013.10.006
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Calcium oxalate (CaOx) crystals are a common natural feature of many plant families, including the Leguminosae. The functional role of crystals and the mechanisms that underlie their deposition remain largely unresolved. In several species, the seasonal deposition of crystals has been observed. To gain insight into the effects of rainfall on crystal formation, the morphology, distribution and accumulation of calcium oxalate crystals in phyllodes of the leguminous Acacia sect. Juliflorae (Benth.) C. Moore & Betche from four climate zones along an aridity gradient, was investigated. The shapes of crystals, which include rare Rosanoffian morphologies, were constant between species from different climate zones, implying that morphology was not affected by rainfall. The distribution and accumulation of CaOx crystals, however, did appear to be climate-related. Distribution was primarily governed by vein density, an architectural trait which has evolved in higher plants in response to increasing aridity. Furthermore, crystals were more abundant in acacias from low rainfall areas, and in phyllodes containing high concentrations of calcium, suggesting that both aridity and soil calcium levels play important roles in the precipitation of CaOx. As crystal formation appears to be calcium-induced, we propose that CaOx crystals in Acacia most likely function in bulk calcium regulation. (C) 2013 Elsevier Masson SAS. All rights reserved.
引用
收藏
页码:219 / 228
页数:10
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