. 2021 Jun 14;150(1-3):195–211. doi: 10.1007/s11120-021-00853-z

Table 1.

Values of correlation indices for the relationships between the indicators obtained by the laboratory chemical analyses and the parameters derived from the noninvasive measurements by three different devices measured in salt-exposed plants

Device parameter	Handy PEA			PhotosynQ	Multiplex-3	SPAD-502
Device parameter	F_v/F_m	PI_abs	RC/ABS	ETR_PSII	F₇₃₅/F₆₈₅	SPAD
K⁺	0.39^ns	0.49*	0.49*	0.65**	0.60**	0.49*
Na⁺	− 0.54*	− 0.67**	− 0.64**	− 0.77**	− 0.70**	− 0.56*
K⁺/Na⁺	0.52*	0.59**	0.57**	0.74**	0.63**	0.47*
Proline	0.55*	0.65**	0.66**	0.73**	0.64**	0.64**
MDA	− 0.57**	− 0.72**	− 0.69**	− 0.77**	− 0.76**	− 0.66**
Soluble sugars	0.45*	0.56*	0.54*	0.67**	0.54*	0.60**

Bold font indicates high correlation

**Significant at the P < 0.01 level; *significant at the P < 0.05 level; ^nsnon-significant