Table 5.

Stepwise regression for grain yield in the field based on the 44 traits in the greenhouse.

Yield components	Percentage of square	Effect value	Fisher test value
Grain weight/spike chaff (main shoot)	13.84	0.25361	0.000571***
Leaf number (main shoot)	11.31	−0.14824	0.001676**
Grain length (main shoot)	5.22	0.14363	0.029014*
Grain width (tillers)	4.98	−0.22353	0.032889*
Total	35.35

Note: individual grain width means the grains from tillers; the other three traits are from main shoot. Grain weight/spike chaff is the ratio between spike weight and spike chaff on the main shoot. *, **, *** suggest the significance of Fisher test value on 0.05, 0.01, 0.001 level, respectively.