. 2018 May 1;9:576. doi: 10.3389/fpls.2018.00576

Table 6.

Correlation coefficients between grain yield of summer maize and chloroplast ultrastructures during growth stages (V6: six-leaf stage; R1: silking stage; R3: milk stage).

Correlation coefficients	V6	R1	R3
Chloroplast per mesophyll cell	0.931^NS	0.956^∗	0.995^∗∗
Grana per chloroplast	0.956^∗	-0.917^NS	-0.962^∗
Lamellae per grana	0.920^NS	0.985^∗	0.968^∗
Lamellae per chloroplast	0.974^∗	0.955^∗	0.962^∗

NS, not significant, P > 0.05. ^∗, ^∗∗Significant at the 0.05 and 0.01 probability level, respectively.