scholarly journals Chlorophyll Fluorescence Transient Analysis in Alternanthera tenella Colla Plants Grown in Nutrient Solution with Different Concentrations of Copper

2013 ◽  
Vol 5 (8) ◽  
Author(s):  
Cristina C. Cuchiara ◽  
Ilda Mariclei C. Silva ◽  
Emanuela G. Martinazzo ◽  
Eugenia Jacira B. Braga ◽  
Marcos Antonio Bacarin ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Nutrient Solution ◽  
Transient Analysis ◽  
Fluorescence Transient ◽  
Chlorophyll Fluorescence Transient

An analysis of the chlorophyll fluorescence transient by spectral multi-exponential approximation

BIOPHYSICS ◽  
2015 ◽  
Vol 60 (3) ◽  
pp. 392-399 ◽  
Author(s):  
T. Yu. Plyusnina ◽  
S. S. Khruschev ◽  
G. Yu. Riznichenko ◽  
A. B. Rubin
Keyword(s):  
Chlorophyll Fluorescence ◽  
Exponential Approximation ◽  
Fluorescence Transient ◽  
Chlorophyll Fluorescence Transient

scholarly journals Sensitivity of Antarctic freshwater algae to salt stress assessed by fast chlorophyll fluorescence transient

2013 ◽  
Vol 3 (2) ◽  
pp. 163-172 ◽  
Author(s):  
David Miguel Vilumbrales ◽  
Kateřina Skácelová ◽  
Miloš Barták
Keyword(s):  
Energy Transfer ◽  
Salt Stress ◽  
Chlorophyll Fluorescence ◽  
Electron Transport ◽  
Excitation Energy ◽  
Reaction Center ◽  
Excitation Energy Transfer ◽  
Ps Ii ◽  
Fluorescence Transient ◽  
Chlorophyll Fluorescence Transient

In this study, we investigated the effects of salt stress (2 mM NaCl) on excitation energy transfer from light harvesting complexes to photosystem II (PS II) in two Antarctic algal species: Klebsormidium sp. and Zygnema sp. Short-term salt stress led to a significant changes in the shape of chlorophyll fluorescence transient (OJIP). Analyses of the polyphasic fluorescence transients (OJIP) showed that the fluorescence yield at the phases J, I and P declined considerably with the time of exposition to salt stress. In both experimental species, OJIP transients reached lowest values of chlorophyll fluorescence signal after 30/60 min. of NaCl exposition. Then, OJIP shape and chlorophyll fluo-rescence showed species-specific recovery and rised towards original values (about 2/3 of untreated control). Analyses of chlorophyll fluorescence parameters derived from OJIPs showed that salt stress led to a decrease in the maximal efficiency of PS II photo-chemistry (FV/FM) in Zygnema sp. but not Klebsormidium sp. The results indicated that the probability of excitation energy transfer before and beyond QA, and the yield of electron transport beyond QA is limited by salt-induced stress in Zygnema sp. In addition, salt stress resulted in a decrease in the photosynthetic electron transport per PS II reaction center, but both increase and decrease in the trapping per PS II reaction center was found. Performace index (PIabs) was affected negatively in Zygnema sp. but possitively Klebsormidium sp. indicating that the latter species was more resistant to salt stress than Zygnema sp.

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