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Calcium Oxalate Formation in Lemna minor: Physiological and Ultrastructural Aspects of High Capacity Calcium Sequestration

• The function of calcium oxalate (CaOx) raphide crystal formation, and structural features related to regulation of crystal formation, were studied in Lemna minor fronds using physiological and microscopy techniques. • Specialized crystal-forming cells (crystal idioblasts) increased in number and s...

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Published in:The New phytologist 2004-02, Vol.161 (2), p.435-448
Main Authors: Ahmed M. A. Mazen, Zhang, Dianzhong, Franceschi, Vincent R.
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description • The function of calcium oxalate (CaOx) raphide crystal formation, and structural features related to regulation of crystal formation, were studied in Lemna minor fronds using physiological and microscopy techniques. • Specialized crystal-forming cells (crystal idioblasts) increased in number and size; CaOx, but not soluble oxalate, increased in response to increasing calcium in the growth medium. Size and number of idioblasts had a distinct upper limit. • The CaOx crystals are formed in membranous 'chambers' and connected in rows by parallel membrane sheets, both forming de novo in the vacuole. The chambers, but not parallel membranes, had calcium associated with them. A calcium-binding matrix protein was associated with idioblast vacuoles and crystal formation. • Leman crystal idioblasts function as calcium-inducible, specialized high-capacity but saturable sinks for bulk regulation of calcium, and crystal deposition is a highly controlled process requiring intravacuolar membrane systems and calcium-binding organic matrix materials.
doi_str_mv 10.1111/j.1469-8137.2004.00923.x
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A. Mazen</creatorcontrib><creatorcontrib>Zhang, Dianzhong</creatorcontrib><creatorcontrib>Franceschi, Vincent R.</creatorcontrib><title>Calcium Oxalate Formation in Lemna minor: Physiological and Ultrastructural Aspects of High Capacity Calcium Sequestration</title><title>The New phytologist</title><addtitle>New Phytol</addtitle><description>• The function of calcium oxalate (CaOx) raphide crystal formation, and structural features related to regulation of crystal formation, were studied in Lemna minor fronds using physiological and microscopy techniques. • Specialized crystal-forming cells (crystal idioblasts) increased in number and size; CaOx, but not soluble oxalate, increased in response to increasing calcium in the growth medium. Size and number of idioblasts had a distinct upper limit. • The CaOx crystals are formed in membranous 'chambers' and connected in rows by parallel membrane sheets, both forming de novo in the vacuole. 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source Wiley; JSTOR Archival Journals and Primary Sources Collection
subjects Biological and medical sciences
Calcium
Cell membranes
Crystals
Fundamental and applied biological sciences. Psychology
Lemna
Lemna minor
matrix protein
membranes
Mesophyll cells
Metabolism
Metabolism. Physicochemical requirements
Mineral precipitation
oxalate
Oxalates
Physiological regulation
Plant cells
Plant physiology and development
Plants
vacuole
Vacuoles
title Calcium Oxalate Formation in Lemna minor: Physiological and Ultrastructural Aspects of High Capacity Calcium Sequestration
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