Short Day Plants vs Long Day plants: Major differences between Short-Day Plants and Long-Day plants
Short day plants
1. The plants require photoperiods below a critical day length.
2. They require a skotoperiod( period of darkness) above a critical length.
3. They are called long night plants.
4. Interruption of the dark period by a flash of light prevents flowering.
5. There is no induction of flowering if alternate light and dark periods are shortened.
6. The plants do not flower in continuous light.
7. Short-day plants do not flower under long-day conditions as it reduces the length of a dark period.
8. Abscisic acid promotes flowering in some short day plants under non-inductive photoperiods.
9. Gibberellin does not help in flowering under non-inductive photoperiods.
10. Interruption of light period by darkness has no effect on flowering.
11. Short-day plants would flower under long-day conditions as it reduces the length of the dark period.
12. The plants flower in autumn, winter and early spring.
Long Day plants
1. The plants require photoperiods above a critical day length.
2. The required skotoperiod for long-day plants is below a critical length.
3. They are called short night plants.
4. Flowering is promoted if the dark period is interrupted by light.
5. Flowering is inhibited if the light period is interrupted by darkness.
6. Alternate short cycles of light and darkness induce flowering.
7. The plants would flower under such continuous light.
8. Long day plants do not flower under short-day conditions as the duration of their dark period exceeds the critical skotoperiod.
9. Abscisic acid does not induce flowering under non-inductive photoperiods.
10. Long day plants would not flower under such conditions.
11. Gibberellin induces flowering under non-inductive photoperiods.
12. The plants’ flower in late spring and summer.