Abstract
The influence of nickel (NiSO4, 10–100 JμM) on vegetative growth, turion formation and light-induced turion germination of Spirodela polyrhiza was investigated. The growth rate was strongly inhibited, but the carbohydrate content was increased. It is assumed that this effect was caused by inhibition of photoassimilate transport. In accordance, turion formation was inhibited by nickel although it is commonly favoured by carbohydrate formation stimulating factors. Uptake and accumulation of nickel by vegetative fronds and its translocation into turions were demonstrated. In dormant turions, nickel stimulated germination under autotrophic, but not under mixotrophic conditions. In non-dormant (after-ripened) turions no stimulation of germination by nickel was observed. «Nickel-loaded turions» (application of nickel during formation but not during germination of turions) were non-dormant and started germination immediately without after-ripening treatment. Therefore, nickel breaks dormancy and replaces after-ripening.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call