Table 1. Summary statistics on yield and yield components of RIL, BC, and MPH data in two hybrids.

Trait	Env.	Mean			Min			Max			Parents			MPH	CK1
		RIL	BC	MPH	RIL	BC	MPH	RIL	BC	MPH	♀	♂	F1	%	CK2
XZ hybrid
SY (g)	E1	57.27	70.14	6.30	28.23	47.37	−12.33	93.74	90.37	27.44	71.23	69.99	72.35	2.46	88.36
	E2	65.92	79.69	9.13	33.12	53.56	−18.02	90.46	101.17	30.87	75.75	68.85	97.21	34.45	97.62
	E3	81.64	95.06	12.93	38.22	57.25	−11.78	125.31	144.69	42.59	80.81	73.44	116.59	51.17	98.09
LY (g)	E1	22.39	27.55	2.35	10.72	17.65	−4.99	37.71	37.78	12.65	28.29	23.74	27.98	7.55	35.68
	E2	25.63	30.83	3.56	11.40	21.52	−7.00	36.36	40.10	12.35	30.18	22.43	38.12	44.92	40.55
	E3	31.07	36.79	5.16	14.45	21.14	−5.45	52.24	55.21	16.16	31.33	25.45	44.44	56.53	40.96
BNP	E1	16.50	18.96	0.80	7.25	12.60	−3.81	28.06	25.00	8.03	19.34	16.56	19.97	11.25	16.28
	E2	20.63	23.90	1.25	11.63	19.00	−4.94	27.06	29.31	6.16	24.63	21.59	27.63	19.56	20.34
	E3	21.16	21.25	0.61	14.06	15.38	−7.03	30.75	29.50	7.14	20.38	17.66	21.81	14.67	21.69
BW (g)	E1	4.84	4.90	0.30	3.46	4.24	−0.33	6.39	5.55	0.99	4.71	5.23	5.19	4.43	6.37
	E2	4.22	4.54	0.27	3.02	3.70	−0.42	5.14	5.21	0.93	4.50	4.86	4.97	6.20	6.41
	E3	4.77	5.12	0.33	3.48	4.32	−0.81	5.80	5.82	1.31	5.03	5.12	5.35	5.42	5.73
LP (%)	E1	39.16	39.27	−0.18	33.40	35.60	−3.02	45.45	44.06	3.50	39.68	33.89	38.67	5.12	40.39
	E2	38.93	38.70	0.08	34.39	35.11	−2.33	43.42	42.47	3.37	39.78	32.50	39.17	8.38	41.49
	E3	37.95	38.69	0.23	31.42	34.10	−2.89	43.77	43.05	4.38	38.80	34.70	38.09	3.65	41.72
XZV hybrid
SY (g)	E1	58.00	55.56	−4.62	30.24	25.50	−31.49	96.26	86.77	26.82	63.76	55.38	69.95	17.42	82.64
	E2	63.79	84.95	13.49	20.08	60.18	−11.55	103.82	107.16	37.31	88.28	64.64	91.72	19.96	108.32
	E3	67.09	105.49	27.29	13.69	64.94	−14.10	132.75	145.06	79.72	66.13	51.52	102.88	74.89	106.69
LY (g)	E1	22.15	20.56	−1.37	10.85	9.44	−11.17	36.97	33.91	11.27	23.78	20.22	27.42	24.64	33.45
	E2	24.44	31.91	5.16	7.66	21.07	−4.28	44.20	40.69	13.37	33.90	24.29	34.93	20.05	46.02
	E3	26.96	43.42	11.84	6.05	26.51	−5.97	57.54	59.68	33.57	25.59	19.73	42.83	89.01	45.91
BNP	E1	15.08	17.68	2.19	8.50	12.13	−2.53	21.56	23.69	7.97	16.15	15.28	19.63	24.91	15.75
	E2	20.32	24.71	3.49	7.18	18.69	−3.38	32.63	31.69	12.47	26.47	18.34	26.08	16.40	21.34
	E3	15.81	20.97	4.27	4.89	15.13	−5.31	29.13	29.56	13.61	15.09	13.15	20.88	47.88	20.66
BW (g)	E1	4.41	4.71	0.22	2.94	3.90	−0.55	5.57	5.49	1.11	4.46	4.71	5.11	11.45	6.57
	E2	4.21	4.67	0.21	3.29	4.18	−0.46	5.47	5.59	1.27	4.25	4.48	4.62	5.84	6.56
	E3	5.00	5.14	0.21	3.72	4.00	−0.88	6.43	6.10	1.54	4.92	4.86	5.42	10.84	5.69
LP (%)	E1	38.10	36.97	0.50	28.08	32.38	−2.17	43.49	43.99	7.04	37.48	36.66	39.18	5.69	40.46
	E2	38.32	37.54	0.07	27.48	33.28	−3.43	43.92	42.01	2.88	38.49	37.59	38.04	0.00	42.44
	E3	39.97	41.13	0.84	31.40	38.39	−2.31	46.96	44.91	4.15	38.99	38.40	41.56	7.40	43.06

MPH was calculated as follows: MPH = F₁ – MP, where F₁ was the mean trait value of the BC(V)F₁, and MP = [RIL(V)’ + GX1135]/2 was the mid-parental trait values of the corresponding female RIL(V)’ and the recurrent parent. MPH (%) = (F₁ – MP) / MP%, where F₁ was the mean trait value of, XZ or XZV hybrid and MP = (GX1135 + GX100 – 2(V)) / 2 was the mid-parental trait values of parents of XZ or XZV hybrid. CK₁ is ‘Ruiza 816’ at Handan (E1) and Cangzhou (E2); CK₂ is ‘Ezamian 10’ at Xiangyang (E3). Env., Environment; MPH, mid-parental heterosis; RIL, recombinant inbred line population; BC, backcross population; SY, seed cotton yield; E1, Handan; E2, Cangzhou; E3, Xiangyang; LY, lint yield; BNP, bolls per plant; BW, boll weight; LP, lint percent.