Table 1.

Parental and population minimums, maximums, means, standard deviations and coefficient of variations for grain protein concentration (GPC)

Environ. a	Parental lines		RIL population
	ZGMLEL	Schooner	Min.	Max.	Mean	SD b	CV(%) c	h B 2(%) d
E1	22.02 ± 0.53	16.45 ± 0.37	16.08	23.36	19.23	1.34	6.95	80.67
E2	21.54 ± 0.20	16.80 ± 0.62	16.01	23.05	19.25	1.36	7.07
E3	22.41 ± 0.23	16.56 ± 0.19	14.08	23.75	19.87	1.55	7.80
E4	20.52 ± 0.21	16.35 ± 0.25	15.72	22.93	19.25	1.38	7.18
E5	21.70 ± 0.33	16.70 ± 0.26	14.78	22.28	18.83	1.31	6.94
E6	22.88 ± 0.10	17.20 ± 0.09	16.35	24.83	20.80	1.50	7.22

^aE1, 2013-Beijing; E2, 2014-Beijing; E3, 2014-Hebei; E4, 2014-Ningxia; E5, 2015-Ningxia; E6, 2015-Hebei

^bSD is the standard deviation

^cCV is the coefficient of variation

^d h _B ² is the broad sense heritability estimated across all six environments