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Calcium oxalate in plants: formation and function.

Vincent R Franceschi1, Paul A Nakata

  • 1School of Biological Sciences, Washington State University, Pullman, Washington 99164-4236, USA. vfrances@wsu.edu

Annual Review of Plant Biology
|May 3, 2005
PubMed
Summary

Plants form calcium oxalate (CaOx) crystals for calcium regulation and defense. This biomineralization process involves specialized cells and genetic control, not random precipitation.

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Area of Science:

  • Plant biology
  • Biomineralization
  • Biochemistry

Background:

  • Calcium oxalate (CaOx) crystals are widespread in photosynthetic organisms, from algae to angiosperms and gymnosperms.
  • CaOx crystal accumulation serves crucial roles in high-capacity calcium regulation and herbivory defense within plants.
  • The formation of CaOx crystals is a complex biomineralization process, not merely random precipitation.

Purpose of the Study:

  • To investigate the intricate cellular and genetic mechanisms governing calcium oxalate crystal formation in plants.
  • To understand how plants control crystal shape, size, and growth in specialized cells.

Main Methods:

  • Ultrastructural analysis of CaOx crystal formation.
  • Developmental studies of crystal growth and cell expansion.
  • Genetic and biochemical analyses of CaOx synthesis and regulation.

Main Results:

  • CaOx crystal formation is a highly regulated process, not random precipitation.
  • Specific cell types are specialized for CaOx accumulation.
  • Crystal morphology is consistent within species, indicating genetic control.
  • Mechanisms for calcium uptake, oxalic acid synthesis, and crystal growth regulation have been identified.

Conclusions:

  • Plant biomineralization of CaOx crystals is under precise genetic and cellular control.
  • Specialized cellular machinery manages calcium and oxalate levels for controlled crystal formation.
  • Understanding these mechanisms provides insights into plant physiology and defense strategies.

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