Fig. 9. Freezing curves of fractionated tissue from oat crowns (see Fig. 1) showing the latent heat of fusion at –2°C. For comparison, a separate freezing curve for 0.59 g of water was included with the freezing curves of the apical region and crown core. (A) The first 3 h of the 6-h freezing event. (B) The first 20 min of the same freezing event in (A) to show differences in initial freezing rates.