Table II.

Effects of heat, chilling, and excessive PAR on the variable fluorescence of duckweed ecotypes and mutants and tobacco transgenics

Species	Relative Variable Fluorescence of Plants Exposed to:
	Control	Heat	Chilling	Excessive PAR
	Fv/Fm
S. punctata ecotypes
760	0.79 ± 0.02	0.56 ± 0.05	0.70 ± 0.03	0.65 ± 0.02
203	0.79 ± 0.02	0.56 ± 0.04	0.67 ± 0.02	0.61 ± 0.02
L. gibba mutants
3F7-11	0.79 ± 0.01	0.59 ± 0.03	0.56 ± 0.02	0.61 ± 0.02
mTR	0.77 ± 0.01	0.56 ± 0.04	0.52 ± 0.03	0.61 ± 0.01
PL	0.78 ± 0.01	0.54 ± 0.03	0.54 ± 0.04	0.58 ± 0.03
R1	0.77 ± 0.01	0.59 ± 0.04	0.61 ± 0.02	0.61 ± 0.04
Tobacco transgenics
WT	0.79 ± 0.01	0.53 ± 0.02	0.64 ± 0.02	0.54 ± 0.04
Overexpressor	0.78 ± 0.01	0.55 ± 0.03	0.63 ± 0.02	0.54 ± 0.04
Antisense	0.79 ± 0.01	0.55 ± 0.03	0.68 ± 0.02	0.54 ± 0.04