For LDP and SDP explain the consequence of interrupting a lo

For LDP and SDP, explain the consequence of interrupting a long dark period with a burst of light. Will both LDP and SDP plants flower?

Solution

Phytochrome is the pigment that is responsible for photoperiodism. This pigment exists in two forms the active form P_fr and the inactive form P_{r .} when P_fr is present it triggers the flowering response and the germination response. Long day plants flower when the length of the day is longer while short day plants flower when the day length is short. when both LDP and SDP plants are expose to flash of intermittent light in the dark period only LDP shows flowering response this is because this flash of light converts inactive form of phytochrome into active form and signals flowering while in short day plants the reverse happens and the plants get signal that day length i slonger hence do not flower.