Question

Difference between short day , long day day neutral

Answer 1

Hi There,

Short-Day Plants:

1. They flower when exposed to day lengths shorter than a certain critical minimum.

2. What is more critical is the continuous dark period.

 3. They do not flower if dark period is interrupted by a flash of light.

4. Interruption by dark during long light period does not stimulate flowering.

5. Flowering is not induced if plants are subjected to short light and short dark periods (e.g. 6 hr. light followed by 6 hr. dark).

6. Gibberellic acid (GA) does not induce flowering except in a few plants like balsam.

 7. They are also called long night plants.

8. They normally flower in the early spring or autumn.

Long-Day Plants:

1. They flower when exposed to day lengths longer than a certain critical maximum.

2. What matters more is the length of the light period.

3. Flowering is stimulated if dark period is interrupted by a flash of light.

4. Interruption by dark during long light period does not inhibit flowering.

5. Flowering is induced if plants are exposed to short light periods with still shorter dark periods (e.g. 8 hr. light followed by 4 hr. dark).

6. GA induces flowering in most of the long day plants.

7. They are also called short night plants.

8. They normally flower in the spring or early summer.

Answer 2

HÈLLØ!!

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⭕Long day plants (LDP) :

➖These plants flower when the days are longer.

➖They require more than the critical duration of light to flower (usually 14-16 hours).

➖The light period is very critical in LDP plants.

➖Prolongation of the light period or a brief exposure to light during the dark period boosts flowering in these plants.

➖One usually does not find LDP plants in places where the length of a day is too short.

➖They are also called ‘Short Night Plants’.

➖Examples – spinach, radish, hibiscus etc.

⭕Short Day Plants (SDP) :

➖These plants flower when the days are shorter.

➖They need less than the critical duration of light (about 8-10 hours) and a continuous dark period (about 14-16 hours) to flower.

➖The dark period is very critical for SDP plants and has to be continuous.

➖These plants will not flower if the dark period is briefly interrupted by light.

➖SDP plants are usually not found in places where the length of a day is too long.

➖They are also called ‘Long Night Plants’.

➖Examples – soybean, tobacco, chrysanthemum etc.

⭕Day Neutral Plants (DNP) :

➖These plants do not follow this restriction of critical duration.

➖In other words, they are ‘neutral’ to the length of day or night.

➖Examples – tomatoes, pea plants, rose etc.

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THÅÑKẞ!!