Figure 1. (A) The cold stress index, calculated as the sum of low
temperatures during the vegetative growth of sunflower, calculated using
the SUNFLO crop model for two contrastinged environments: warm CO09 and
cold LO10 from Mangin et al. (2017) and (B) the minimum and maximum
daily temperatures for warm (CO09) and cold (LO10) environments in the
experiment of Mangin et al. (2017). Error bars represent 1.5 times the
interquartile range. (C) The control and chilling stress treatments
(duration: three weeks) in the present study, the latter consisting of
an 8 h night at 5°C and a 16 h day at 18°C. |