Difference between Short Day Plants and Long Day Plants

The upcoming discussion will update you about the differences between Short Day Plants and Long Day Plants.

Difference # Short Day Plants:

1. Plants are induced to flower by photoperiods below a critical length.

2. Short day plants are also called long night plants because they require darkness above a critical level.

3. Plants do not flower under long day conditions as the critical dark period is not achieved.

4. Plants can flower in complete darkness if supplied with exogenous nutrients.

5. Flowering is prevented if dark period below the critical level is interrupted by a flash of light.

6. Interruption of light by dark does not inhibit flowering.

7. They do not flower under alternate short light and dark periods.

8. Supply of gibberellins does not induce flowering (exception — Balsam) under non- inductive photoperiods.

9. Abscisic acid promotes flowering in some cases.

10. Short day plants flower in autumn-spring periods.

Difference # Long Day Plants:

1. The plants come to flower after receiving photoperiods above a critical length.

2. Long day plants are also called short night plants because they require darkness below a critical level.

3. Plants do not flower under short day conditions as the dark period is above the critical length.

4. Plants cannot flower under complete darkness. They can, however, do so in continuous light.

5. Flowering is stimulated if dark period: is interrupted by light.

6. Interruption of light by dark inhibits flowering under normal photoperiods.

7. Long day plants come to flower under alterna­ting short cycles of light and darkness.

8. Supply of gibberellins induces flowering in many cases under non-inductive photo­periods.

9. Abscisic acid does not promote flowering.

10. Long day plants flower in late spring- summer periods.