Phytochrome: The pigment responsible for the photo induction or inhibition of flowering in short day plants and stimulation of flowering in long day plants is called Phytochrome. It is proteinaceous in nature. Phytochrome acts as photoreceptor molecule by absorbing light and showing its effect on various developmental and morphogenetic process.

2021年11月24日 · To gain insights into the signaling mechanisms at the atomic level during the reversible Pr-Pfr photoswitching in full-length BphPs, we intended to solve the crystal structures of Xcc BphP in the Pr and Pfr photostates.

2024年11月23日 · Plants regulate photoperiodism by measuring the Pfr/Pr ratio at dawn, which then stimulates physiological processes such as flowering, setting winter buds, and vegetative growth.

2019年11月19日 · Phytochromes exist in two conformations, Pr and Pfr, the latter being the active form. They exist as dimers so three species can be found. Each monomer can be activated by red light (R) and...

In short-day plants, the active form of phytochrome (Pfr) suppresses flowering. During long periods of darkness (long nights), Pfr is converted to Pr. With Pfr no longer present, flowering is not suppressed, and short-day plants flower. If a flash of light interrupts the dark period, Pr is converted back to Pfr, and flowering is suppressed.

2008年8月28日 · Phytochrome acts as a molecular switch in response to red and far-red light. It occurs in two reversible conformations (Pr and Pfr), which absorb red light (R) and far-red light (FR) respectively.

2004年7月6日 · Photoreversibility occurs because phytochromes exist as two distinct but photoreversible forms in vivo: the R light-absorbing form (Pr) and the FR light-absorbing form (Pfr). The Pr form absorbs maximally at 660 nm, whereas the Pfr form absorbs maximally at 730 nm (Quail, 1997a; Figure 1).