Negative costimulation

TLS Online TPP Program

#Id: 3406

#Unit 6. System Physiology – Plant

Cytochrome b6f complexes are evenly distributed

TLS Online TPP Program

#Id: 3408

#Unit 6. System Physiology – Plant

Most commonly, the ratio of PSII to PSI is about 1.5:1, but it can change when plants are grown in different light conditions.

TLS Online TPP Program

#Id: 3414

#Unit 6. System Physiology – Plant

STN7 The kinase is activated when plastoquinone, one of the electron carriers between PSI and PSII, accumulates in the reduced state.

TLS Online TPP Program

#Id: 3429

#Unit 6. System Physiology – Plant

In molecules, two types of excited states can exist;
a) The singlet state is relatively short‐lived and contains electrons with opposite (antiparallel) spins.
b) The more long‐lived triplet state has electron spins that are aligned (parallel).

TLS Online TPP Program

#Id: 3430

#Unit 6. System Physiology – Plant

Triplet states generally have much longer lives (take longer to de‐excite) than singlet states and are at a lower energy level.

TLS Online TPP Program

#Id: 3431

#Unit 6. System Physiology – Plant

Absorption of blue or red light causes the chlorophyll molecule to convert into an excited state, with blue light absorption resulting in a higher excited state because of the greater energy of blue light relative to red light.