Calcium-accumulating cells in the meristematic region of grapevine root apices

Functional Plant Biology : FPB
Richard StoreyMichael T Treeby

Abstract

Apical roots of grapevines were examined by cryo-SEM (scanning electron microscopy) and the intracellular distribution of Ca was demonstrated by X-ray microanalysis in different regions of the primary root. We show that large amounts of Ca are accumulated as raphide crystals in the vacuoles of specialised cortical cells (idioblast cells) of the root apex. These crystal idioblast cells appeared to form a discontinuous cone of cells in the outer region of the root meristem. The raphide crystals within these cells were less apparent in older regions of the root, 10-12 mm basipetal to the root tip. We suggest that the raphide crystals could initially act as another Ca sink involved in the regulation of Ca levels in root apices. In older regions of the root these cells are spaced at intervals around the periphery of the cortex and the subsequent disappearance of the raphides may be indicative of remobilisation, perhaps in the zone of elongation where cell wall synthesis occurs and Ca demand is high. Calcium-accumulating cells were also observed in the older regions of the root, forming endodermal protrusions extending into the cortex. These cells may play a part in regulating Ca delivery to the xylem stream by sequestration of Ca fr...Continue Reading

Citations

Nov 7, 2019·The Plant Journal : for Cell and Molecular Biology·Megan C SheldenStephen D Tyerman
Jul 27, 2010·Protoplasma·Maclin DayodMatthew Gilliham
May 3, 2005·Annual Review of Plant Biology·Vincent R Franceschi, Paul A Nakata
Apr 23, 2010·Annals of Botany·Simon Conn, Matthew Gilliham
Apr 23, 2011·Journal of Experimental Botany·Matthew GillihamStephen D Tyerman
Nov 11, 2020·Journal of Experimental Botany·Lukasz KotulaHans Lambers

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