Table 1. Recorded traits with their abbreviations.

Trait name	Unit	Abbreviation
Number of tillers		TIL
Maximum leaf length	cm	LL
Maximum root length	cm	RL
Root dry weight	g	ROOT
Shoot dry weight	g	SHOOT
Last fully developed leaf dry weight	g	LEAF
Root-to-shoot ratio		R/S
Leaf area	cm2	LA
Specific leaf area	cm2g-1	SLA
Sodium mass fraction	%	Na
Potassium mass fraction	%	K
Sodium-to-potassium ratio		Na/K