Table 1.

Descriptive statistics of root morphological and architectural traits phenotyped.

Traits	Mean	Maximum	Minimum	SD	SEM	CV	H2
TRL (cm)_5DAT	138.77	340.89	39.13	51.63	3.05	37.21	0.89
TSA (cm2)_5DAT	32.00	89.47	8.17	11.73	0.69	36.67	0.88
DIM (mm)_5DAT	0.74	1.13	0.56	0.08	0.00	10.99	0.83
TRV (cm3)_5DAT	0.60	1.91	0.14	0.24	0.01	40.77	0.84
TRT_5DAT	85.24	213	26.5	28.89	1.71	33.89	0.84
TSA1_5DAT	3.80	13.97	0.34	2.56	0.15	67.42	0.89
TSA3_5DAT	4.41	13.1	0.6	2.08	0.12	47.17	0.83
TRW (cm)_5DAT	10.63	20.57	3.64	2.92	0.17	27.50	0.82
TCA (cm2)_5DAT	99.55	239.38	30.86	36.32	2.14	36.48	0.86
RDI_5DAT	0.44	0.74	0.22	0.11	0.01	23.94	0.74
SOL_5DAT	0.11	0.17	0.06	0.02	0.00	19.27	0.76
COPM_5DAT	4.75	7.67	2.84	0.88	0.05	18.58	0.85
TRL (cm)_8DAT	248.38	739.91	71.41	105.93	6.25	42.65	0.92
TSA (cm2)_8DAT	56.61	162.18	14.23	21.70	1.28	38.34	0.9
DIM (mm)_8DAT	0.74	0.99	0.51	0.08	0.00	10.80	0.83
TRV (cm3)_8DAT	1.05	2.85	0.23	0.39	0.02	37.70	0.86
TRT_8DAT	153.78	377.5	50.33	57.79	3.41	37.58	0.89
TSA1_8DAT	10.98	46.1	2.4	7.28	0.43	66.30	0.92
TSA3_8DAT	7.56	22.93	1.19	3.38	0.20	44.77	0.83
TRW (cm)_8DAT	14.41	28.2	6.58	4.01	0.24	27.81	0.85
TCA (cm2)_8DAT	160.74	462.5	40.68	69.57	4.11	43.28	0.92
RDI_8DAT	0.51	0.8	0.23	0.11	0.01	21.49	0.74
SOL_8DAT	0.12	0.19	0.06	0.03	0.00	21.74	0.75
COPM_8DAT	5.79	10.83	3.56	1.26	0.07	21.70	0.9

Note (abbreviations for traits): Total root length (TRL), total root volume (TRV), average root diameter (DIM), total surface area (TSA), total surface area of thinner roots [or diameter class 0 to 0.5 mm diameter (TSA1)] and surface area of thicker roots [or diameter class 1 to 1.5 mm diameter (TSA3)], total root width (TRW), total convex area (TCA), root depth index (RDI), solidity (SOL), and center of projected mass (COPM) were calculated from root images at 5 and 8 DAT.