Photoperiod regimes used in the experiment.

Each growth chamber was set to simulate the natural seasonal photoperiod pattern of a different location in China: Baiquan (BQ), Chengde (CD), Tumotezuoqi (TM), Wenan (WA), Rongan (RA), Qiongzhong (QZ), or Qiongshan (QS). The first column (Day) divides the experimental period into successive 10-d segments. The other columns show the photoperiod settings for each growth chamber during each 10-d period. Note that each location gives photoperiods for only those weeks in the field when air temperature exceeded 14.2°C. Photoperiod data derived from (http://cdc.cma.gov.cn/home.do).