Photosystem II Functionality in Vivo after Photoinhibition: Interpretation of changes in the chlorophyll fluorescence parameter, F0, in terms of an exciton-radical pair equilibrium model

1995 ◽  
pp. 3343-3346
Author(s):  
Wah Soon Chow ◽  
Youn-Il Park
Keyword(s):  
Chlorophyll Fluorescence ◽  
Photosystem Ii ◽  
Equilibrium Model ◽  
Radical Pair ◽  
Chlorophyll Fluorescence Parameter ◽  
Fluorescence Parameter

scholarly journals Use of the method of measurement of chlorophyll fluorescence to determine the phytotoxicity of mesotrione in poppy (Papaver somniferum) in relation to application factors

2010 ◽  
Vol 58 (5) ◽  
pp. 107-116
Author(s):  
Jana Filová ◽  
Vojtěch Kocurek ◽  
Vladimír Smutný
Keyword(s):  
Chlorophyll Fluorescence ◽  
Quantum Yield ◽  
Photosystem Ii ◽  
Research Work ◽  
Papaver Somniferum ◽  
Maximum Quantum Yield ◽  
Herbicide Application ◽  
Chlorophyll Fluorescence Parameter ◽  
Fluorescence Parameter ◽  
Method Of Measurement

The aim of the research work was to evaluate phytotoxicity of mesotrione in poppy (Papaver somniferum). The amount of spraying water (150, 300 and 450 l per hectare) was compared as well. In the end, the different growth stimulators (Atonik – 0.6 l . ha−1, Route – 0.8 l . ha−1) and the adjuvants (Atplus 463 – 0.5% solution, Silwet 77 – 0.1 l . ha−1) wre tested. Degree of phytotoxicity of individual va­riants was assessed by measuring chlorophyll fluorescence (parameter: maximum quantum yield of electron transport in photosystem II - QY) in 1st to 21st day after treatment. The results showed that the application of mesotrione caused phytotoxicity on poppy plants. The most significant phy­to­to­xi­ci­ty is evident at doses of 450 l spraying water per hectare. Addition of growth stimulators and adjuvants increases the phytotoxicity (decreases the value of QY) compared to the herbicide application itself. The mesotrione reduced the weight of dry plants by 15 % (150 l of spraying water), 1 % (300 l of spraying water) and 64 % (450 l of spraying water) compared to control variant.

Metabolie Reduction of Phenylpropanoid Compounds in Primary Leaves of Rye (Secale cereale L.) Leads to Increased UV-B Sensitivity of Photosynthesis

1993 ◽  
Vol 48 (9-10) ◽  
pp. 749-756 ◽  
Author(s):  
S. Reuber ◽  
J. Leitsch ◽  
G. H. Krause ◽  
G. Weissenböck
Keyword(s):  
Photosystem Ii ◽  
Essential Role ◽  
Phenylalanine Ammonia Lyase ◽  
Ps Ii ◽  
Efficient Inhibitor ◽  
Flavone Glycosides ◽  
Fluorescence Parameter ◽  
Secale Cereale L

Abstract In the epidermal layers of rye primary leaves two flavone glycosides and several hydroxycinnamoyl esters are localized, whereas the mesophyll contains two flavone glucuronides and two anthocyanins. The concentrations of all these potential UV-B protective phenylpropanoid compounds could be reduced by application of 2-aminoindan-2-phosphonic acid (AIP), an efficient inhibitor of phenylalanine ammonia-lyase (EC 4.1.3.5). Photosystem II in the primary leaves of seven-days-old plants, grown in the presence of 20 μm AIP up to an age of 80 h, was more severely affected by UV-B than in control plants with the normal concentration of phenylpropanoid compounds. Damage of photosystem II in vivo was estimated by measuring the chlorophyll a fluorescence (parameter FJFm) of PS II. The results indicate an essential role of phenylpropanoid com pounds as UV-B protectants in rye primary leaves

scholarly journals Two Quenchers Formed During Photodamage of Phostosystem II and The Role of One Quencher in Preemptive Photoprotection

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Alonso Zavafer ◽  
Ievgeniia Iermak ◽  
Mun Hon Cheah ◽  
Wah Soon Chow
Keyword(s):  
Chlorophyll Fluorescence ◽  
Photosystem Ii ◽  
Time Course ◽  
Physiological Role ◽  
Reaction Centre ◽  
Time Resolved ◽  
Fluorescence Quencher

AbstractThe quenching of chlorophyll fluorescence caused by photodamage of Photosystem II (qI) is a well recognized phenomenon, where the nature and physiological role of which are still debatable. Paradoxically, photodamage to the reaction centre of Photosystem II is supposed to be alleviated by excitation quenching mechanisms which manifest as fluorescence quenchers. Here we investigated the time course of PSII photodamage in vivo and in vitro and that of picosecond time-resolved chlorophyll fluorescence (quencher formation). Two long-lived fluorescence quenching processes during photodamage were observed and were formed at different speeds. The slow-developing quenching process exhibited a time course similar to that of the accumulation of photodamaged PSII, while the fast-developing process took place faster than the light-induced PSII damage. We attribute the slow process to the accumulation of photodamaged PSII and the fast process to an independent quenching mechanism that precedes PSII photodamage and that alleviates the inactivation of the PSII reaction centre.

scholarly journals In vivo label-free mapping of the effect of a photosystem II inhibiting herbicide in plants using chlorophyll fluorescence lifetime

Plant Methods ◽  
2017 ◽  
Vol 13 (1) ◽  
Author(s):  
Elizabeth Noble ◽  
Sunil Kumar ◽  
Frederik G. Görlitz ◽  
Chris Stain ◽  
Chris Dunsby ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Photosystem Ii ◽  
Fluorescence Lifetime ◽  
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