Fig. 2.

Correlation of four grain shape traits in four environments. The upper panel contains the correlation coefficients, and the lower panel contains the distributions of the four traits. The diagonal represents the density line of the traits. *, ** and *** represent significant at 0.05, 0.01 and 0.001, respectively. GL, GW, LWR and TGW represent grain length, grain width, grain length–width ratio and thousand grain weight, respectively. HZ and LS represent Hangzhou and Lingshui, respectively