GPP and PCR also were positively correlated with WT (GPP and WT:pb0.0001, n=44; PCR and WT: pb0.0001, n=44), and the slope of the regression line between PCR and WT was higher than that between GPP and WT (PCR and WT: b=1.66±0.33; GPP and WT: 1.39±0.36;Fig. 5A).