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Rate of net photosynthesis (AN; A–C), effective quantum yield of PSII (ΦPSII; D–F) and non-photochemical quenching (NPQ; G–I) in response to irradiance in young lamina without pitcher (A, D, G), older lamina (B, E, H) and pitcher (C, F, I). Fed and unfed plants as indicated, values are means ± s.e. PAR, photosynthetically active radiation.
