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Figure 2
(a) Response of Fq′/Fm′ of a variegated Tradescantia leaf to PPFD. Data were obtained from guard cells in white (open circles) areas of the leaf and from mesophyll (solid squares) and guard cells (solid circles). Measurements were made at a CO2 of 360 µmol mol-1. The inset in (a) shows the relationship between Fq′/Fm′ for mesophyll and guard cells in green areas over the range of PPFDs (the line is y = 0.76x; r2 = 0.92) (b) Response of Fq′/Fm′ of mesophyll (solid and open squares) and guard cells (solid and open circles) to increasing CO2 in the green areas of a Tradescantia leaf in an atmosphere containing 2% (open squares and circles) or 21% (solid squares and circles) O2. Measurements were made at a PPFD of 215 µmol m-2 s-1. |
