Protein and RNA Synthesizing Activities during Sexual Process of Heterothallic Closterium.

Protein and RNA synthesizing activities increased markedly during the mating process and decreased during the maturation stage of zygotes in heterothallic strains of Closterium peracerosum-strigosum-littoale, KAS-4-29 (mating-type minus) and KAS -4-30 (mating-type plus) and a homothallic Closterium acerosum. Different proteins were synthesized at the different stages of the mating process, suggesting that a sequential expression and repression of mating genes occur for the mating-specific protein synthesis during the sexual reproduction.