Table 1. Heritability (h ²) and mean square (MS) of analysis of variance (ANOVA) for water use efficiency (WUE), carbon isotope discrimination (CID), biomass (BM) and cumulative water transpired (CWT) for 150 recombinant inbred lines (RILs), two stable soil water contents (SWC) and two replicates in Exp. 2012 (n = 600).

Trait	h2	MS
		Genotype	Soil water content	Genotype×soil water content
WUET2012	0.26	0.50***	28***	0.25ns
CID	0.41	1.68***	1100***	0.53ns
BM	0.36	0.51***	180***	0.29**
CWT23d	0.36	40862***	31746440***	25565***

**Significant at P<0.01,

***significant at P<0.001.

^nsNot significant.