Table 1.

GI sensitivity to day length significantly correlates with the latitude or with the day length variation at the site of origin of the accessions. The correlation coefficient (R) and the p value (p) were determined with the Pearson test. The absolute GI peak time difference is the absolute difference between GI peak times measured in LDs of 16 h and LDs of 12 h. The relative GI peak time variation was obtained by normalizing the peak time differences between LDs of 12 and LDs of 16 h to the total variation from SDs of 8 h to LDs of 16 h (illustrated in Fig. 1A). The angle of the response was determined as represented in Fig. 1A. The latitudinal data were obtained from.⁴⁴ Only the 63 accessions whose geographical origin had been verified were included in the analysis.⁴⁴ The day length data were determined based on the geographical coordinates of each accession, and the day length variation at the site of origin was calculated between the spring equinox and the summer solstice (21st of March and 21st of June, respectively).

		Angle	Relative GI peak time variation from LDs of 12 to 16 h	Absolute GI peak time variation from LDs of 12 to 16 h
Latitude of origin	R p	−0.361 0.004	−0.336 0.007	−0.263 0.037
Day length variation at the site of origin	R p	−0.347 0.005	−0.331 0.008	−0.25 0.049