Table 1.

Leaf biomass, chlorophyll fluorescence, gas exchange, chlorophyll, nitrogen and carbon concentration, and photosynthetic nitrogen use efficiency in young lamina without pitcher

Parameter	Unfed	Fed
Leaf dry weight (mg)	104·5 ± 13·7	162·0 ± 12·2*
RD (μmol CO2 m−2 s−1)	1·30 ± 0·16	1·58 ± 0·15ns
RD (nmol CO2 g−1 d. wt s−1)	8·9 ± 2·2	11·5 ± 2·2ns
ANmax (μmol CO2 m−2 s−1)	2·8 ± 0·2	6·0 ± 0·4**
ANmax (nmol CO2 g−1 d. wt s−1)	16·9 ± 0·60	46·1 ± 7·6**
gs (mmol m−2 s−1)	62·1 ± 4·5	152·0 ± 8·2**
Fv/Fm	0·758 ± 0·011	0·800 ± 0·003*
ΦPSII	0·41 ± 0·02	0·52 ± 0·01**
ΦCO2 (mol CO2 mol quanta−1)	0·014 ± 0·001	0·023 ± 0·002**
QP	0·71 ± 0·01	0·77 ± 0·01**
NPQ	1·28 ± 0·13	0·84 ± 0·06*
C (mg g−1 d. wt)	459·8 ± 2·4	468·4 ± 3·1*
N (mg g−1 d. wt)	10·6 ± 1·0	18·6 ± 2·2*
PNUE (μmol CO2 mol N−1 s−1)	23·7 ± 1·6	32·5 ± 2·4*
Chl a + b (mg g−1 d. wt)	1·21 ± 0·11	2·72 ± 0·22**
Chl a/b	1·91 ± 0·3	2·15 ± 0·03**

See Appendix for definitions. Values shown are means ± s.e., n = 5. Significantly different values (t-test) are indicated: * P < 0·05, ** P < 0·01; ns, non-significant differences.