Environments | E1 | E2 | E3 | E4 |
|---|
Days before flowering | 23~27 | 19~23 | 23~26 | 18~23 |
r | −0.48*~ − 0.52* | − 0.77**~ − 0.87** | −0.81**~ − 0.86** | −0.70**~ − 0.77** |
Tm_C (MFI = 0) | 12.18~12.94 | 12.32~12.97 | 9.07~9.10 | 13.15~13.34 |
- E1, pot cultivation (flower period 11/3/2017–30/3/2017), Yangling, Shaanxi; E2, field condition in 2016 (flower period 30/3/2016–15/4/2016), Yangling, Shaanxi; E3, field condition in 2017 (flower period 2/4/2017–17/4/2017), Yangling, Shaanxi; E4, greenhouse (flower period 19/2/2017–7/3/2017, 12 h/d in the temperature regimes of 28.5 °C (day) -10 °C (night)). The term ‘days before flowering’ means that temperature data at this time correlated significantly to the MFI (male fertility index) of the line 373S. r, Pearson correlation coefficient between MFI and the day mean temperature indicated by days before flowering. Tm_C, the calculated critical temperature when MFI = 0. * Significantly at 95% confidence level; ** Significantly at 99% confidence level
