"Thermoperiodicity" refers to response of the plant to high day temperature and low temperature rather than a constant temperature. It is commonly observed in

"Thermoperiodicity" refers to the response of the plant to high day temperature and low temperature rather than a constant temperature. It is commonly observed in tomatoes.
It is also called thermal periodicity, the growth or flowering responses of plants to alternation of warm and cool periods. Daily temperature fluctuations produce dramatic effects on the growth or flowering of most plants.
This phenomenon has been applied to the production of tomatoes. Most flowers are produced when tomatoes are grown at 26.7°C during the day and 17.2° - 20°C at night. Thermoperiodic effects are distinct from photoperiodic effects.