Table 2 Physiological parameters in young and old fronds of P. cretica var. Albo-lineata

Chl A (nmol ml⁻¹)

11 ± 0.2^bB

10 ± 0.5^aB

2.6 ± 0.6^bA

1.5 ± 0.4^abA

1.0 ± 0.5^a

Chl B (nmol ml^− 1)

4.8 ± 1.0^bB

2.8 ± 0.2^aB

2.6 ± 0.7^bA

1.9 ± 0.4^abA

0.6 ± 0.2^a

Chl A/Chl B (−)

2.4 ± 0.4^aB

3.6 ± 0.03^bB

1.1 ± 0.7^aA

0.9 ± 0.5^aA

1.4 ± 0.4^a

Σ Chl (nmol ml^− 1)

16 ± 1.0^bB

13 ± 0.7^aB

5.2 ± 0.1^bA

3.4 ± 0.3^abA

1.6 ± 0.7^a

Crt (nmol ml^− 1)

2.4 ± 0.1^aB

2.3 ± 0.3^aB

0.5 ± 0.2^aA

0.3 ± 0.1^aA

0.3 ± 0.04^a

Fv/Fm (µmol m^-2 s^-1)

0.8 ± 0.02^bB

0.7 ± 0.03^aB

0.7 ± 0.02^bA

0.6 ± 0.07^aA

0.5 ± 0.1^a

WP (MPa)

−1.4 ± 0.09^aB

−1.9 ± 0.03^bB

−1.7 ± 0.04^aA

−3.7 ± 0.03^bA

−2.5 ± 0.4^ab

E(mmol H₂O m⁻² s⁻¹)

0.7 ± 0.2^aA

0.9 ± 0.2^bA

0.8 ± 0.1^bA

0.7 ± 0.1^aA

0.3 ± 0.04^a

P_N (μmol CO₂ m^− 2 s^− 1)

8.1 ± 0.1^bB

7.7 ± 0.04^aB

7.7 ± 0.04^bA

7.2 ± 0.03^abA

6.7 ± 0.1^a

WUE (−)

12 ± 2.7^bA

8.6 ± 1.3^aA

9.7 ± 1.2^aA

9.4 ± 0.6^aA

24.4 ± 1.6^b