Table 1.

Pollen fertility of PA64S, D52S and NK58S by photoperiod and temperature treatment.

Photoperiod and Temperature Condition	S/F Plant	Pollen Fertility (%)
LD-NT (about 27 °C)	NK58S-S	4.63 ± 1.87 **
SD-NT (about 27 °C)	NK58S-F	70.61 ± 5.49
SD-NT (about 27 °C)	D52S-S	1.34 ± 0.30 **
LD-NT (about 27 °C)	D52S-F	48.93 ± 2.01
LD-HT (28 °C)	PA64S-S	0.00 ± 0.00 **
LD-LT (21 °C)	PA64S-F	41.35 ± 1.76

Values are expressed as mean ± standard deviation, n = 120. ** Asterisks indicate significant differences between S and F plants revealed by Student’s t-test (p < 0.01). LD, long-day cycle of 14 h-light and 10 h-dark; SD, short-day cycle of 10 h-light and 14 h-dark; HT, high temperature; NT, normal temperature, LT, low temperature; S/F, sterile/fertile plants.