Effects of Dibutyryl Cyclic AMP and Dibutyryl Cyclic GMP on the Changes in Invertase, Lipase, and Some Dehydrogenase Activities during Germination of Pine Pollen

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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.