Abstract
Effects of exogenous Bt2cAMP and Bt2cGMP on the changes in lipase, glucose-6-phosphate dehydrogenase, glutamate dehydrogenase, and invertase activities were investigated during the germination of pollen from Pinus densiflora SIEB. et Zucc. Both nucleotides cooperatively restored the lipase activity which was depressed by exogenous sucrose, but had no effect on the change in glucose-6-phosphate dehydrogenase activity. Either Bt2cAMP or Bt2cGMP partially restored the glutamate dehydrogenase activity which was depressed by exogenous sucrose. Bt2cGMP lowered the invertase activity during germination, whereas Bt2cAMP reversed this depression. Using inhibitors of RNA and protein synthesis, we suggested that Bt2cAMP and Bt2cGMP control the invertase activity at the transcriptional and translational levels, respectively.
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