Are calcium oxalate crystals a dynamic calcium store in plants?
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Data
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Universidade Federal de Minas Gerais
Descrição
Tipo
Artigo de periódico
Título alternativo
Primeiro orientador
Membros da banca
Resumo
Calcium oxalate (CaOx) crystals occur as intravacuolar deposits in
most angiosperm species. Different functions have been attributed
to these crystals, some of which are very speculative, until now.
Calcium regulation and homeostasis seem to be the most
widespread function of CaOx crystals. Being rich in calcium, these
crystals constitute a reserve of calcium for plants. However, despite
being bioavailable, this reserve is functional in just a few situations
due to the low mobility of calcium for phloem translocation.
Therefore,CaOxcrystals as a calcium reserve is a paradox because in
most cases the reserve cannot be used. However, in most plants,
these crystals occur in organs or tissues that will be discarded, which
allows the elimination of excess calcium. This suggests that CaOx
crystals have a functional role in excess calcium excretion. There is
some evidence that, for calcium, this excretory function is relevant
for plants since they lack an excretory system dedicated to
discarding solid wastes, such as calcium salts.
Abstract
Assunto
Oxalato de cálcio, Floema, Magnoliopsida
Palavras-chave
Calcium oxalate, Calcium reserve, Excretion in plants, Calcium transport, Phloem, Plant crystals