Fig. 8 Relationship of abscisic acid (ABA) in leaves and grains with the acid invertase (INV) and synthase sucrose (SS) activities during grain filling in the semi-winter wheat cultivars Yangmai 158 (•) and Yangmai 931 (). Data represent the peak values of each treatment during water withholding. Correlation coefficients (r) are calculated with stars indicating statistical significance at the P_0.05 (*) or P_0.01 (**) levels

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