regulation of pollen germination of petunia was investigated by determining rna content and composition in an in vitro system in the presence and absence of the transcription inhibitor actinomycin d and by labelling with c14-orotic acid.at the beginning of the progamic phase 2 stages can be distinguished : first ( up to 15 minutes ) no essential rna synthesis occurs , but merely a release takes place of the protein-bound rna carried by the pollen grains .
C0040649
transcription
C0035668
rna