Arid
DOI10.1093/aob/mcs004
Morphologies and elemental compositions of calcium crystals in phyllodes and branchlets of Acacia robeorum (Leguminosae: Mimosoideae)
He, Honghua1; Bleby, Timothy M.1; Veneklaas, Erik J.1; Lambers, Hans1; Kuo, John2
通讯作者He, Honghua
来源期刊ANNALS OF BOTANY
ISSN0305-7364
EISSN1095-8290
出版年2012
卷号109期号:5页码:887-896
英文摘要

Formation of calcium oxalate crystals is common in the plant kingdom, but biogenic formation of calcium sulfate crystals in plants is rare. We investigated the morphologies and elemental compositions of crystals found in phyllodes and branchlets of Acacia robeorum, a desert shrub of north-western Australia.


Morphologies of crystals in phyllodes and branchlets of A. robeorum were studied using scanning electron microscopy (SEM), and elemental compositions of the crystals were identified by energy-dispersive X-ray spectroscopy. Distributional patterns of the crystals were studied using optical microscopy together with SEM.


According to the elemental compositions, the crystals were classified into three groups: (1) calcium oxalate; (2) calcium sulfate, which is a possible mixture of calcium sulfate and calcium oxalate with calcium sulfate being the major component; and (3) calcium sulfate magnesium oxalate, presumably mixtures of calcium sulfate, calcium oxalate, magnesium oxalate and silica. The crystals were of various morphologies, including prisms, raphides, styloids, druses, crystal sand, spheres and clusters. Both calcium oxalate and calcium sulfate crystals were observed in almost all tissues, including mesophyll, parenchyma, sclerenchyma (fibre cells), pith, pith ray and cortex; calcium sulfate magnesium oxalate crystals were only found in mesophyll and parenchyma cells in phyllodes.


The formation of most crystals was biologically induced, as confirmed by studying the crystals formed in the phyllodes from seedlings grown in a glasshouse. The crystals may have functions in removing excess calcium, magnesium and sulfur, protecting the plants against herbivory, and detoxifying aluminium and heavy metals.


英文关键词Acacia robeorum biomineralization calcium oxalate calcium sulfate crystal sand druses Leguminosae magnesium oxalate Mimosoideae prisms raphides styloids
类型Article
语种英语
国家Australia
收录类别SCI-E
WOS记录号WOS:000301971900007
WOS关键词OXALATE CRYSTALS ; PLANTS ; LEAVES ; TISSUE ; BIOSYNTHESIS ; SOLANACEAE ; PATTERNS ; DEPOSITS ; DEFENSE ; RAPHIDE
WOS类目Plant Sciences
WOS研究方向Plant Sciences
来源机构University of Western Australia
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/171210
作者单位1.Univ Western Australia, Sch Plant Biol, 35 Stirling Highway, Crawley, WA 6009, Australia;
2.Univ Western Australia, Ctr Microscopy Characterisat & Anal, Crawley, WA 6009, Australia
推荐引用方式
GB/T 7714
He, Honghua,Bleby, Timothy M.,Veneklaas, Erik J.,et al. Morphologies and elemental compositions of calcium crystals in phyllodes and branchlets of Acacia robeorum (Leguminosae: Mimosoideae)[J]. University of Western Australia,2012,109(5):887-896.
APA He, Honghua,Bleby, Timothy M.,Veneklaas, Erik J.,Lambers, Hans,&Kuo, John.(2012).Morphologies and elemental compositions of calcium crystals in phyllodes and branchlets of Acacia robeorum (Leguminosae: Mimosoideae).ANNALS OF BOTANY,109(5),887-896.
MLA He, Honghua,et al."Morphologies and elemental compositions of calcium crystals in phyllodes and branchlets of Acacia robeorum (Leguminosae: Mimosoideae)".ANNALS OF BOTANY 109.5(2012):887-896.
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