Changes in leaf economic trait relationships across a precipitation gradient are related to differential gene expression in a C<sub>4</sub> perennial grass.

Similarly, there was a marginally significant interaction between precipitation and N MASS ( P = 0.076; Table S9 ): biomass and N MASS were negatively associated at low precipitation but not at high precipitation ( P < 0.001 and P = 0.124, respectively; Table S10 ).

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