Krupa Z, Oquist G, Huner NPA
The Influence of Cadmium on Primary Photosystem-Ii Photochemistry in Bean as Revealed by Chlorophyll-a Fluorescence - a Preliminary-Study
Acta Physiologiae Plantarum: 1992 14:71-76
Cd-treated bean plants (Phaseolus vulgaris L., cv. Scarlett) were used to investigate the effect of this heavy metal on growth, pigment content and photosystem II photochemistry. The toxic effect of Cd on the growth and photosynthetic pigment content was confirmed. Analyses of fast chlorophyll a fluorescence kinetics revealed no considerable decrease in the ratio of variable (F(v)) to maximal (F(m)) fluorescence, which allow us to conclude that the primary photochemistry of photosystem II is unaffected by Cd concentrations causing strong effects on growth and pigmentation. The significant decrease in half rise time (t1/2) of rise from initial (F(o)) to maximal (F(m)) fluorescence may result from a decreased pool size of plastoquinone upon exposure to Cd.
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