The characteristic absorption parameter for the sample is the extinction coefficient a, yielding the correlation I= I 0 e -d .

TLS Online TPP Program

#Id: 9814

#Unit 6. System Physiology – Plant

The PHYA gene is transcriptionally active in dark-grown seedlings, but its expression is strongly inhibited in the light in monocots.

TLS Online TPP Program

#Id: 9815

#Unit 6. System Physiology – Plant

The PRD domain of phyB serve as an NLS. 

Conversion of Pr to Pfr by red light expose the functional NLS of the PRD domain of phyB, facilitating phyB’s import into the nucleus.

TLS Online TPP Program

#Id: 9816

#Unit 6. System Physiology – Plant

PRD domain of phyA cannot act as an NLS, so to transport it into the nucleus requires FARRED ELONGATED HYPOCOTYL1 (FHY1) and its homolog FHY1-LIKE (FHL),

TLS Online TPP Program

#Id: 9817

#Unit 6. System Physiology – Plant

Phytochrome responses fall into three major categories based on the amount of light they require: very low fluence responses (VLFRs), low-fluence responses (LFRs), and high-irradiance responses (HIRs).

TLS Online TPP Program

#Id: 9818

#Unit 6. System Physiology – Plant

VLFRs are non-photoreversible.

TLS Online TPP Program

#Id: 9819

#Unit 6. System Physiology – Plant

Arabidopsis seeds can be induced to germinate with red light in the range of 0.001 to 0.1 μmol m–2 at very-low-fluence responses (VLFRs).