Size and specific radioactivity of the [h]thymidine triphosphate pool and DNA synthesis in the radicles of germinating cotton.

By relating the specific radioactivity, size, and turnover of the labeled thymidine triphosphate pool to DNA synthesis, it was shown that the 32- to 38-hour interval of cotton seedling (Gossypium barbadense L.) germination was the peak period of DNA synthesis within the radicle tip during a total germination time of 48 hours at 35 C.