Calcium delivery and storage in plant leaves: Exploring the link with water flow

Matthew Gilliham, Maclin Dayod, Bradleigh J. Hocking, Bo Xu, Simon J. Conn, Brent N. Kaiser, Roger A. Leigh, Stephen D. Tyerman

Research output: Contribution to journalReview article

115 Citations (Scopus)

Abstract

Calcium (Ca) is a unique macronutrient with diverse but fundamental physiological roles in plant structure and signalling. In the majority of crops the largest proportion of long-distance calcium ion (Ca2+) transport through plant tissues has been demonstrated to follow apoplastic pathways, although this paradigm is being increasingly challenged. Similarly, under certain conditions, apoplastic pathways can dominate the proportion of water flow through plants. Therefore, tissue Ca supply is often found to be tightly linked to transpiration. Once Ca is deposited in vacuoles it is rarely redistributed, which results in highly transpiring organs amassing large concentrations of Ca ([Ca]). Meanwhile, the nutritional flow of Ca2+ must be regulated so it does not interfere with signalling events. However, water flow through plants is itself regulated by Ca2+, both in the apoplast via effects on cell wall structure and stomatal aperture, and within the symplast via Ca2+-mediated gating of aquaporins which regulates flow across membranes. In this review, an integrated model of water and Ca 2+ movement through plants is developed and how this affects [Ca] distribution and water flow within tissues is discussed, with particular emphasis on the role of aquaporins.

Original languageEnglish
Pages (from-to)2233-2250
Number of pages18
JournalJournal of Experimental Botany
Volume62
Issue number7
DOIs
Publication statusPublished - 1 Apr 2011
Externally publishedYes

Keywords

  • Aquaporins
  • calcium
  • calcium storage
  • leaf hydraulic conductance
  • leaf water flow
  • transpiration

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