Dissecting combining ability effect in a rice NCII-III population provides insights into heterosis in indica-japonica cross

Rice

Table 2 Phenotypic correlation (r) coefficients for agronomic traits in DHs and TC populations

Correlations	GF	PH	HD	YD	TP	KGW	SP	GP	SS	PL	SDEN
DHs and GCA_DHs	0.32^**	0.86^**	0.75^**	0.06	0.36^**	0.55^**	0.66^**	0.38^**	0.12	0.67^**	0.73^**
ZS97 × DHs and DHs	0.34^**	0.83^**	0.83^**	0.42^**	0.40^**	0.58^**	0.69^**	0.57^**	0.36^**	0.69^**	0.79^**
ZS97 × DHs and GCA_DHs	0.78^**	0.89^**	0.83^**	0.50^**	0.82^**	0.77^**	0.68^**	0.47^**	0.48^**	0.87^**	0.74^**
ZS97 × DHs and SCA_ZS97×DHs	0.78^**	0.52^**	0.44^**	0.80^**	0.73^**	0.40^**	0.57^**	0.70^**	0.79^**	0.38^**	0.42^**
WYG × DHs and DHs	0.23^*	0.60^**	0.44^**	−0.31^**	0.22^*	0.44^**	0.31^**	−0.17^*	−0.16^*	0.56^**	0.34^**
WYG × DHs and GCA_DHs	0.52^**	0.76^**	0.48^**	0.67^**	0.64^**	0.65^**	0.68^**	0.58^**	0.67^**	0.71^**	0.69^**
WYG × DHs and SCA_WYG×DHs	0.74^**	0.17^*	0.17^*	0.81^**	0.62^**	0.33^**	0.50^**	0.74^**	0.85^**	0.25^**	0.48^**
P64S × DHs and DHs	0.25^**	0.82^**	0.57^**	−0.05	0.22^*	0.58^**	0.43^**	0.33^**	0.11	0.62^**	0.59^**
P64S × DHs and GCA_DHs	0.73^**	0.91^**	0.88^**	0.62^**	0.70^**	0.73^**	0.79^**	0.64^**	0.59^**	0.87^**	0.83^**
P64S × DHs and SCA_P64S×DHs	0.63^**	0.33^**	0.61^**	0.58^**	0.66^**	0.22^*	0.65^**	0.46^**	0.24^*	0.31^**	0.63^**
GCA_DHs and SCA_ZS97×DHs	0.22^*	0.21^*	0.17^*	−0.08	0.24^*	0.02	−0.08	−0.10	−0.11	0.03	−0.13
GCA_DHs and SCA_WYG×DHs	−0.20^*	−0.35^**	−0.56^**	0.19^*	−0.18^*	−0.15^*	−0.15^*	0.08	0.29^**	−0.26^**	−0.15^*
GCA_DHs and SCA_P64S×DHs	−0.06	0.10	0.36^**	−0.21^*	−0.07	−0.11	0.24^*	−0.07	−0.45^**	0.00	0.26^**

GCA_DHs denote the general combining ability of DH lines; SCA_ZS97×DHs, SCA_WYG×DHs and SCA_P64S×DHs indicate the special combining ability for hybrids of ZS97 × DHs, WYG × DHs and P64S × DHs
GF grian-filling degree, PH plant height, HD heading date, YD yield, TP number of tillers per panicle, KGW grain weight per 1000 grains, SP spikelet per panicle, GP number of grains per panicle, SS seed-setting rate, PL panicle langth, SDEN grain density per panicle
^* P < 0.05, ^** P < 0.01