Fig. 3.

Effects of cell cycle inhibitors on seed aging after priming determined by a microplate assay. a A schematic diagram showing the cell cycle phases and target sites of mimosine, aphidicolin, hydroxyurea and oryzalin. G1: the period for cell growth during which nuclei have a 2C DNA content; S: the DNA replication phase that results in a doubling of the DNA content (from 2C to 4C); G2: the second growth period with nuclei having a 4C DNA content; and M: mitosis, during which genetic material is divided into two daughter nuclei (from 4C to 2C). b Col-0 seeds primed in the presence of various concentrations of cell cycle inhibitors were subjected to CDT for 3 days and then tested for their viabilities. Photographs were taken 7 days after imbibition