Table I.

Chl fluorescence and content of wild-type, ΔPsbP, and ΔPsbQ tobacco plants

Data presented are mean ± sd of three measurements.

Wild TypeΔPsbPΔPsbQ
Fv/Fma0.82 ± 0.010.47 ± 0.030.81 ± 0.01
ΦPSIIb0.73 ± 0.020.22 ± 0.090.73 ± 0.01
Total chl (mg/g fresh weight)0.69 ± 0.140.42 ± 0.050.72 ± 0.12
Chl a/b ratio3.25 ± 0.052.12 ± 0.113.24 ± 0.03

  • ↵a The Fv/Fm value was measured after incubation in the dark for 2 h.

  • ↵b The ΦPSII was measured under illumination in a growth chamber (100 μE m−2 s−1).