THE INDUCEMENT OF CHLOROPHYLL FLUORESCENCE IN STATE TRANSITIONSUNDER LOW TEMPERATURE IN THE Mougeotia ALGA, STRAIN AICB 560

摘要

The alga was grown using Bold nutritive solution (BBM) with continuous air stirring and illuminationwith 485 μmol.m~(-2)·s~(-1), at 22~0 C, during exponential growth. F_has decreased instate 2underpreillumination and low temperature, and in state I, in the presence of DCMU and methylviologen,F_0 has been the same with control value. F. decreased in bothstate 1and2which lead to adecrease of the variable fluorescence. The F_v/F_mand the quantum yield decreased significantly inboth redox states, highlighting the photoinhibition of the closed reaction centers. The excitationpressure decreased, and in the presence of DBIMB, it increased in state 1, which states the growth ofthe closed QA proportion. qp has increased in state 1 which emphasizes the growth of the opened QAproportion. The increase in the non-photochemical dissipation of the excitation energy is correlatedwith the excitation pressure. The inducement of chlorophyll fluorescence with quenching analysis on a short period of time in state1 and 2 on whole cells marks out the proportionality ratio with the light harvesting antenna size.