Through their effects on plant growth regulators, what do the temperature and light control in the plants ?

Explanation

Light and temperature may affect flowering in plants in various ways. The effect of photoperiods or daily duration of light hours (and dark periods) on flowering is called photoperiodism. For example, in short-day plants flowering occurs when the day length is below critical period, e.g., dahlia, rice etc. In long day plants, flowering occurs when day length is above critical period, e.g., spinach, lettuce etc. In short long day plants, short photoperiod is required for floral initiation and long photoperiod is required for blossoming and viceversa for long short day plants.