TABLE 3.

Xylem sap and cell wall pH in different plant species.

Species	Xylem sap pH	Cell wall pH	References
Acer pseudoplatanus	6.9	6.2	Essiamah, 1980; Taylor and Davies, 1985
Arabidopsis thaliana	6	5.5	Bibikova et al., 1998; Martinière et al., 2018
Betula pendula	7.5	5.5	Taylor and Davies, 1985; Sauter and Ambrosius, 1986
Brassica napus	7.4	6	Husted and Schjoerring, 1995; Gloser et al., 2016
Helianthus annuus	7.2	5.3	Jia and Davies, 2007; Gloser et al., 2016
Phaseolus coccineus	6.6	5.9	Starrach and Mayer, 1989; Gloser et al., 2016
Pisum sativum	6.2	6	Jacobs and Ray, 1976; Gloser et al., 2016