HORTICULTURE

Detailed explanation-1: -Spinach and lettuce are examples of long-day plants. What stimulus causes them to flower? fertilizing the plant with nitrogen.

Detailed explanation-2: -The flowering response in short-day plants and long-day plants is dependent on the duration for which these plants are exposed to light. The short-day plant and long day plant can flower at the same place, provided they have been given an adequate photoperiod.

Detailed explanation-3: -Flowering stimulus: Florigen The flowering stimulus is produced in leaves and translocated to apical and lateral meristems where flower formation is initiated. Chailakhyan (1937) called the flowering stimulus or flowering hormone as Florigen. Flowering stimulus is similar in long day plants and short day plants.

Detailed explanation-4: -These are termed “long-day” plants. These bloom only when they receive more than 12 hours of light. Many of our summer-blooming flowers and garden vegetables are long-day plants, such as asters, coneflowers, California poppies, lettuce, spinach and potatoes. These all bloom when the days are long, during our summers.

Detailed explanation-5: -Long-day plants flower and grow when the daylight they obtain is more than their critical (required) photoperiod, like in summer season. They need more light than short-day plants and usually flower when the temperature becomes warmer. Examples of long day plants are spinach, lettuce, radish, sugar beet, etc.