Table 1.

List of studied and derived phenotypic traits with trait acronym and unit.

Traits	Trait acronym	Unit
(A) Shoot morphological traits
Date of emergence	DE	Days after sowing (DAS)
Plant Height	PH	cm
Tiller Number	TN	plant−1
Leaf Number	LN	plant−1
Shoot dry weight	SDW	g plant−1
(B) Root morphological traits
Root length	RL	cm
Root surface Area	RSA	cm2
Root volume	RV	cm3 plant−1
Root average diameter	RAD	mm
Root length to volume	L/V	–
Specific root length	SRL	cm/g
Root mass density	RMD	g/cm3
Number of tips	#tips	plant−1
Number of forks	#forks	plant−1
Root angle	RA	0
Root dry weight	RDW	g plant−1
Root to shoot ratio	R:S	–
(C) Root anatomical traits
Root cross-section area	RXA	mm2
Late metaxylem number	LMXN	plant−1
Average Late metaxylem area	ALMXA	mm
Total cortical area	TCA	mm2
Stele area	SA	mm2
Aerenchyma area	AA	mm2