The regression analysis showed that the maximum grain weight
and the maximum and mean grain-filling rate were very significantly
and positively correlated with free maximum free Spd and
Spm concentrations in grains, and these values were significantly
and negatively correlated with the maximum free Put concentration
in grains (Table 3). Unlike free PAs, the correlations of
maximum soluble-conjugated and insoluble-conjugated PAs concentrations
in grains and the maximum grain weight and the
maximum and mean grain-filling rate were insignificant.