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Curves of the electron transport rate through PSII (ETR) against photosynthetic photon flux density (PPFD); species and treatment details as for Fig. 1. The s.e. are not shown for clarity. The overall effect (two-way ANOVA) of the water regime (WR) is indicated when significant (*** P <0·001; **P < 0·01; *P < 0·05). The effect of the radiation regime (UV, UV-B effect) was not significant in any species.
