Factors affecting the onset of deoxyribonucleic acid synthesis during wheat embryo germination. Study of the changes in DNA polymerases A, B and C and the pool of DNA precursors.
DNA synthesis starts about 12 h after water imbibition in wheat embryos. We have determined that noticeable amounts of labelled thymidine are found inside the embryo only after 6 hr of germination. DNA polymerase C from ungerminated wheat embryos decreased markedly in activity during the first hours of germination, whereas the activities of DNA polymerases A and B increased, having a maximum at about 15 h or germination. Serological evidence has suggested a clear antigenic relationship between DNA polymerases A and C. Although the pool of ATP increases rapidly after water imbibition, the increase in the pool of dNTP species was much slower.
D000937:Antigen-Antibody Reactions; D004247:DNA / Q000096:biosynthesis*; D004259:DNA-Directed DNA Polymerase / Q000276:immunology / Q000378:metabolism*; D007527:Isoenzymes / Q000378:metabolism*; D009711:Nucleotides / Q000378:metabolism; D012639:Seeds / Q000378:metabolism*; D013936:Thymidine / Q000378:metabolism; D013937:Thymidine Kinase / Q000378:metabolism; D014908:Triticum / Q000378:metabolism
D007527:Isoenzymes; D009711:Nucleotides; D004247:DNA; D013937:Thymidine Kinase; D004259:DNA-Directed DNA Polymerase; D013936:Thymidine