Table 3. Correlations between general heterozygosity/special heterozygosity and hybrid performance/mid-parent heterosis in three environments for the nine yield-correlated traits with significant heterosis.

Traits§			SY	SP	BY	PN	HI	PH	PY	SN	BN	Mean r2
Hybrid performance	General heterozygosity	N6	0.18*	0.15*	0.11*	0.10*	0.13*	0.08	0.09	0.06	-0.03	0.012
		S5	0.30‡	0.18*	/	0.12*	/	0.09	0.11*	0.01	0.04	0.022
		S6	0.13*	0.09	0.10*	0.06	0.08	0.02	0.07	0.04	-0.01	0.006
		Mean r 2	0.046	0.021	0.011	0.009	0.011	0.005	0.009	0.002	0.001	0.013
	Special heterozygosity	N6	0.24‡	0.23‡	0.09	0.19*	0.17*	0.07	0.08	0.07	-0.01	0.022
		S5	0.43‡	0.29‡	/	0.17*	/	0.11*	0.17*	0.09	0.08	0.05
		S6	0.22†	0.09	0.09	0.14*	0.07	-0.07	0.04	0.09	-0.06	0.012
		Mean r 2	0.096	0.048	0.008	0.027	0.017	0.007	0.013	0.007	0.003	0.026
Mid-parent heterosis	General heterozygosity	N6	0.16*	0.13*	0.08	0.06	0.19*	0.08	0.12*	0.06	0.01	0.012
		S5	0.29‡	0.20†	/	0.11*	/	0.13*	0.13*	0.05	0.01	0.025
		S6	0.15*	0.11*	0.08	0.08	0.12*	0.05	0.06	0.02	-0.01	0.008
		Mean r 2	0.045	0.023	0.006	0.007	0.024	0.009	0.012	0.002	0.000	0.014
	Special heterozygosity	N6	0.21†	0.19*	0.02	0.12*	0.19*	0.07	0.13*	0.04	0.01	0.017
		S5	0.39‡	0.27‡	/	0.16*	/	0.16*	0.14*	0.09	0.01	0.044
		S6	0.19*	0.07	0.06	0.12*	0.11*	0.00	0.04	0.04	-0.02	0.008
		Mean r 2	0.078	0.038	0.002	0.019	0.025	0.010	0.013	0.004	0.000	0.022
Mean r 2			0.066	0.032	0.007	0.016	0.019	0.008	0.012	0.004	0.001	0.019

^§For the abbreviation of the traits (ordered according to their correlation coefficients with SY), see MATERIALS AND METHODS.

*, ^† and ^‡ represent the significant level of P = 0.05, 01 and 0.001 respectively.