Botany - Plant Growth and Development Question with Solution | TestHub

Phytochrome is an amorphous photoreceptor protein pigment. It exists in two states,i.e., phytochrome Red$\left({\mathrm{P}}_{\mathrm{r}}\right)$and phytochrome far-red$\left({\mathrm{P}}_{\mathrm{f}\mathrm{r}}\right).$




It is considered that during the day,$P_{fr}$from of the phytochrome is accumulated in the plant which is inhibitory to flowering in short-day plants, but is stimulatory in long day plants.