Table I. Summary of changes in xanthophyll pigment composition and associated changes in photosynthetic parameters measured from rapid light-response curves in attached, sun-exposed avocado shade leaves in experiment 2

Values are means ± se (n = 4).

Attached Leaves; Experiment 2 (1,100 declining to 400 μmol photons m−2 s−1)Induced Shade Leaf60 min of Sunlight300 min of SunlightRecovered 24 h in the Dark
Pigments (mmol mol−1 chlorophyll)
 [Lx]29.6 ± 0.118.8 ± 2.811.7 ± 1.112.0 ± 1.2
 [L]127.8 ± 0.1141.3 ± 1.5145.5 ± 4.0147.0 ± 4.7
DESLx00.420.610.62
 [V]34.0 ± 0.714.7 ± 0.814.1 ± 1.127.6 ± 1.7
 [A]0.2 ± 0.36.2 ± 0.89.2 ± 0.82.8 ± 0.1
 [Z]1.4 ± 0.415.8 ± 1.813.2 ± 0.85.8 ± 0.4
DESV0.07 ± 0.020.60 ± 0.020.61 ± 0.020.24 ± 0.02
Photosynthetic parameters from initial slope and saturation at PFD shown (μmol photons m−2 s−1)
 1 − qP (69)0.45 ± 0.040.37 ± 0.020.36 ± 0.040.62 ± 0.02
 1 − qP (432)0.79 ± 0.020.69 ± 0.010.65 ± 0.040.85 ± 0.03
ETR (69)13.1 ± 1.711.6 ± 0.79.8 ± 1.37.1 ± 0.5
ETR (432)25.3 ± 3.026.1 ± 1.523.3 ± 1.119.5 ± 0.4
NPQ (69)0.19 ± 0.071.26 ± 0.181.39 ± 0.041.72 ± 0.21
NPQ (432)1.13 ± 0.112.27 ± 0.232.50 ± 0.462.40 ± 0.19
Photosynthetic parameters from independent measurements
Fv/Fm0.81 ± 00.68 ± 0.020.64 ± 0.050.63 ± 0.02
 PSII/PSI (arbitrary ratio)0.70 ± 0.030.72 ± 0.050.59 ± 0.050.59 ± 0.04