Table 1.

Data used to predict shoot calcium concentrations ([Ca]_shoot) and magnesium concentrations ([Mg]_shoot) of angiosperm species.

	Cell compartment
	Cell wall	Cytosol	ER	Nucleus	Mitochondria	Chloroplasts	Vacuoles
Volume (% leaf)*
Angiosperms	6.0	5.0	0.5	0.5	1.0	5.0	82
Calcium concentration (mM)†
Angiosperms		0.1	2	2	2	7	2
Magnesium concentration (mM)‡
Angiosperms except Caryophyllales		2	10	10	7	105	3
Caryophyllales		2	10	10	7	105	14
Ca/Mg quotient in material above the minimal cell wall (g g–1)§
Commelinids	4.00
Eudicots except Caryophyllales	10.0
Caryophyllales	5.88

*Heldt and Piechulla (2010); Hawkesford et al. (2012).

^† Carr et al. (2003); White and Broadley (2003); Stael et al. (2012).

^‡ Shaul (2002); Carr et al. (2003); Hawkesford et al. (2012); Gout et al. (2014).

^§Gradients of the relationships between [Mg]_shoot and [Ca]_shoot presented in Fig. 1A and B.