Fig. 3.

Pearson’s correlation analysis (A), principal component analysis (B) and cluster analysis (C) of organic acids under different levels of water deficiency. The data are expressed as average values (n = 3). The * and ** represent significant correlations at the p < 0.05 and p < 0.01 levels, respectively (two-tailed). Abbreviations: CK: The control with full irrigation of 90% the maximum field moisture capacity (FMC); T1: Substrate maintained at 80% maximum FMC; T2: Substrate maintained at 65% maximum FMC; T3: Substrate maintained at 55% maximum FMC; T4: Substrate maintained at 45% maximum FMC.