N allocation and maximum photosynthetic rate of endophyte-infected (EI) or endophyte-free (EF) Achnatherum sibiricum under various conditions of N and P availability.

Note. N_A, total leaf nitrogen content in g m⁻²; P_T, the fraction of leaf nitrogen allocated to all components of the photosynthetic machinery in g g⁻¹; P_max, maximum net photosynthetic rate in µmol m⁻² s⁻¹. Values are means ± SE. Significant differences (P<0.05) for each variable are indicated by lowercase letters for variables N, P availability and endophyte infection were analyzed together.