Table 1.

Summary statistics and units for shoot dry weight, total dry weight, and the 24 root traits characterized in this study in winter wheat.

Trait	Abbreviation	Unit	Mean	Min	Max	H 2
Shoot dry weight	SDW	g	0.039	0.018	0.059	0.57
Total dry weight	TDW	g	0.053	0.024	0.080	0.51
Root dry weight	RDW	g	0.014	0.006	0.022	0.39
Total root respiration	TRR	nmol CO2 s−1	0.54	0.23	0.91	0.42
SRR per root length	SRR_L	nmol CO2 s−1 m−1	0.14	0.04	0.34	0.48
SRR per root mass	SRR_M	nmol CO2 s−1 g−1	39.86	23.32	74.79	0.32
SRR residual	SRR_R	nmol CO2 s−1	−0.0039	−0.3623	0.27	0.44
Specific root length	SRL	m g−1	299.7	182.21	398.36	0.55
Root mass fraction	RMF	%	26.48	19.05	36.17	0.43
Total root length	TRL	mm	4125.91	1315.65	7861.83	0.47
Axial root length	ARL	mm	1456.2	655.59	2537.42	0.48
Lateral root length	LRL	mm	2669.71	660.06	5494.75	0.48
Lateral : axial root length ratio	L‐to‐A_L	mm mm−1	1.82	0.83	2.66	0.48
Total root volume	TRV	mm3	329.49	135.78	610.24	0.45
Axial root volume	ARV	mm3	243.9	113.64	459.5	0.46
Lateral root volume	LRV	mm3	85.59	22.15	164.09	0.40
Lateral : axial root volume ratio	L‐to‐A_V	mm3 mm−3	0.36	0.17	0.53	0.45
Total root surface area	TSA	mm2	3680.62	1348.64	6477.28	0.45
Axial root surface area	ASA	mm3	2034.03	934.42	3639.73	0.47
Lateral root surface area	LSA	mm3	1646.59	414.22	3266.23	0.44
Average root diameter	AvgD	mm	0.29	0.25	0.37	0.53
Number of root tips	Tip	n	399.61	161.67	710	0.40
Number of branch points	BP	n	931.66	283	1992.5	0.54
Branching frequency	BF	n mm−1	0.22	0.18	0.31	0.45
Branching density	BD	n cm−1	2.81	1.75	5.83	0.25
Root tissue density	RTD	g cm−3	0.04	0.03	0.06	0.30

H², broad‐sense heritability.