Figure 5. Proline concentration in zoysiagrass rhizomes and stolons before (nonacclimated) and after cold acclimation (cold acclimated by 4 wk at 8/2°C day/night cycles with a 10-h day photoperiod of 300 µmol m^–2 s^–1) for 13 genotypes. Error bars represent one standard error of the mean (n = 6). Species are indicated by (m) or (j) for Zoysia matrella or Z. japonica, respectively.