Table 4.

Seed germination parameters of B. pilosa from three populations based on thermal-time model analysis at suboptimal and supraoptimal temperature for different water potentials

Population	Water potential (MPa)	suboptimal temperature				supraoptimal temperature
		θT(50) (℃·h)	σθT	Tb(℃)	R2	θT (℃·h)	σTc	Tc(50) (℃)	R2
Baoshan	0	1111.92	0.65	5.38	0.92	890.68	7.30	41.96	0.82
	-0.3	1969.45	0.66	4.58	0.91	1326.15	3.75	34.63	0.93
	-0.6	3374.73	0.69	4.41	0.84	1919.41	3.24	30.97	0.95
Guilin	0	1173.11	0.76	5.95	0.80	637.28	5.30	38.84	0.87
	-0.3	1561.64	0.67	5.58	0.87	825.91	5.94	36.07	0.72
	-0.6	3201.87	0.63	5.10	0.90	2195.41	6.29	33.25	0.89
Danzhou	0	1039.63	0.77	6.81	0.91	823.21	6.58	41.52	0.87
	-0.3	1505.51	0.68	6.66	0.89	733.08	6.45	35.64	0.85
	-0.6	4725.14	0.59	5.14	0.76	1596.29	6.14	34.04	0.81

θ_T(50) = thermal time for 50% of seeds to germinate, σ_θT = standard deviation of log θ_T(50), T_b = constant base temperature in suboptimal temperature range. θ_T = constant thermal time, σ_Tc = standard deviation for T_c(50) at supraoptimal temperature, T_c(50) = maximum temperature for 50% of seeds to germinate