Time-dependent quenching of chlorophyll a fluorescence from (pigment) system II by (pigment) system I of photosynthesis in Chlorella

Mohanty, Prasanna; Munday, John C.

doi:10.1016/0005-2728(70)90145-3

Cited by 14 publications

(3 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Prasanna's unique cooperative spirit had led to his doing outstanding additional research in Govindjee's laboratory with several other graduate students, including John C. Munday, Jr. (experiments on phenomena discovered by G.C. Papageorgiou, in 1967, in green algae and cyanobacteria, which were soon related to what is now known as ''state changes''; Mohanty et al 1970); Ted Mar (on the action of hydroxylamine in red algae; Mohanty et al 1971a); George Papageorgiou (on the understanding of slow fluorescence changes in red algae; Mohanty et al 1971b); Barbara Zilinskas (a detailed understanding of fluorescence changes in isolated thylakoids; Mohanty et al 1972aMohanty et al , b, 1973; and Thomas J. Wydrzynski (salt-induced fluorescence changes in green algae; ). As if this was not enough, Mohanty participated with Govindjee in writing a general review for the American Instrument Company (Govindjee and Mohanty 1971), a chapter in a book on cyanobacteria, published in India (Govindjee and Mohanty 1972), and a review for the Plant Biochemical Journal in India .…”

Section: An Early Beginning: Papers In Science and Naturementioning

confidence: 97%

Prasanna K. Mohanty (1934–2013): a great photosynthetiker and a wonderful human being who touched the hearts of many

et al. 2014

View full text Add to dashboard Cite

Prasanna K. Mohanty, a great scientist, a great teacher and above all a great human being, left us more than a year ago (on March 9, 2013). He was a pioneer in the field of photosynthesis research; his contributions are many and wide-ranging. In the words of Jack Myers, he would be a "photosynthetiker" par excellence. He remained deeply engaged with research almost to the end of his life; we believe that generations of researchers still to come will benefit from his thorough and enormous work. We present here his life and some of his contributions to the field of Photosynthesis Research. The response to this tribute was overwhelming and we have included most of the tributes, which we received from all over the world. Prasanna Mohanty was a pioneer in the field of "Light Regulation of Photosynthesis", a loving and dedicated teacher-unpretentious, idealistic, and an honest human being.

show abstract

Section: An Early Beginning: Papers In Science and Naturementioning

confidence: 97%

Prasanna K. Mohanty (1934–2013): a great photosynthetiker and a wonderful human being who touched the hearts of many

et al. 2014

View full text Add to dashboard Cite

show abstract

“…In addition, Mohanty et al (1970) provided the first measurement that was related to the so-called newly discovered ''state changes'' from the laboratory of Norio Murata and of Jack Myers… JJE-R.] Trained as a biochemist in David Krogmann's laboratory, then located at Wayne State University in Detroit, I was pretty much mystified by the biophysical lingo Govindjee threw at me even though given in his usual charming manner. I was offered and accepted the position and moved to Urbana in October.…”

Section: Ashwani Kumarmentioning

confidence: 99%

Govindjee at 80: more than 50 years of free energy for photosynthesis

Eaton‐Rye

2013

Photosynth Res

View full text Add to dashboard Cite

We provide here a glimpse of Govindjee and his pioneering contributions on the two light reactions and the two pigment systems, particularly on the waterplastoquinone oxido-reductase, Photosystem II. His focus has been on excitation energy transfer; primary photochemistry, and the role of bicarbonate in electron and proton transfer. His major tools have been kinetics and spectroscopy (absorption and fluorescence), and he has provided an understanding of both thermoluminescence and delayed light emission in plants and algae. He pioneered the use of lifetime of fluorescence measurements to study the phenomenon of photoprotection in plants and algae. He, however, is both a generalist and a specialist all at the same time. He communicates very effectively his passion for photosynthesis to the novice as well as professionals. He has been a prolific author, outstanding lecturer and an editor par excellence.

show abstract

“…Pre-illumination of algae and cyanobacteria changes the spectrum and yield of Chl a fluorescence Govindjee (1967, 1968a, b) reported that pre-illumination of a cyanobacterium, Anacystis nidulans, and of a green alga, Chlorella pyrenoidosa, with light mainly absorbed by PS II or by PS I causes characteristic changes in the yield and spectrum of Chl a fluorescence of these organisms (also see Mohanty et al 1970). These changes were attributed to conformational modifications of the pigment-protein complexes in the thylakoid membrane.…”

mentioning

confidence: 98%

The Non-Photochemical Quenching of the Electronically Excited State of Chlorophyll a in Plants: Definitions, Timelines, Viewpoints, Open Questions

Papageorgiou

2014

Advances in Photosynthesis and Respiration

View full text Add to dashboard Cite

SummaryChlorophyll a-containing plants, algae and cyanobacteria absorb sunlight in order to perform oxygenic photosynthesis using two sequential photoreactions: Light Reaction II, which takes place in Photosystem II (PS II), oxidizes water to molecular oxygen (O 2 ) and reduces plastoquinone to plastoquinol; Light Reaction I, which takes place in Photosystem I (PS I), *Author for Correspondence, e-mail: gcpap@bio.demokritos.gr; 533gcp@gmail.com 2 oxidizes plastoquinol to plastoquinone, via cytochrome b 6 f complex, and reduces NADP + (nicotinamide adenine dinucleotide phosphate) to NADPH. In most cases, a large fraction of the electronic excitation acquired by absorbing sunlight is used for running the photoreactions of photosynthesis, a small fraction is emitted as chlorophyll fluorescence, and the remainder is degraded to heat and dissipated to the surroundings. These electronic excitation degradation processes encompass both spontaneous (i.e., "unprovoked") de-excitations (internal conversion) as well as de-excitations triggered and regulated by various physical and chemical signals. These signals involve photosynthetic electron transport (PSET) and are generated within and across the thylakoid membranes. Only the regulated dissipation of electronic excitation is assessed as non-photochemical quenching (NPQ) of chlorophyll fluorescence. Signals triggering NPQ include redox potential shifts of intramembranous electron transport intermediates, electrostatic potential shifts at membrane surfaces, and formation of trans-membrane ion concentration gradients, such as a proton concentration difference (ΔpH). Oxygenic photosynthetic organisms employ various processes to relieve the sensitive PS II from destructive effects of excess electronic excitation (excess excitation energy). The latter goal is achieved either by directly quenching excited states of pigments in the peripheral and the core antenna pigment-protein complexes of PS II, or by moving peripheral antenna complexes from the vicinity of PS II to PS I. In this chapter, we shall outline the remarkable and unprecedentedAbbreviations: A -antheraxanthin; ATMatmosphere; ATP -adenosine triphosphate; CACCore antenna light harvesting Chl a-protein complexes; Chl -chlorophyll; CP22 -see PsbS below; CP24, CP26, CP29 -chlorophyll a-, b-, and xanthophyllbinding proteins of photosystem II with molecular mass of 24, 26 or 29 kDa, respectively; CP43, CP47 -Chl a binding protein of 43kDA, 47 kDa molecular mass; Cyt -cytochrome; D1, D2 -two major proteins of Photosystem II reaction center complex; DCMU -3-(3,4-dichlorophenyl)-1,1-dimethylurea; Dddiadinoxanthin; DDE -diadinoxanthin de-epoxidase; Dd-Dt -diadinoxanthin-diatoxanthin cycle; DGDG -digalactosyldiacylglycerol; Dt -diatoxanthin; ΔpH -trans-thylakoid proton concentration gradient; Fd -ferredoxin; FI -fluorescence induction; FNR -ferredoxin NADP + reductase; fs, ps, nsfemtosecond, picosecond, nanosecond; Ga -billions of years before present; hv -represents a photon of light (h = Planck's constant, and v is frequency o...

show abstract

Time-dependent quenching of chlorophyll a fluorescence from (pigment) system II by (pigment) system I of photosynthesis in Chlorella

Cited by 14 publications

References 10 publications

Prasanna K. Mohanty (1934–2013): a great photosynthetiker and a wonderful human being who touched the hearts of many

Prasanna K. Mohanty (1934–2013): a great photosynthetiker and a wonderful human being who touched the hearts of many

Govindjee at 80: more than 50 years of free energy for photosynthesis

The Non-Photochemical Quenching of the Electronically Excited State of Chlorophyll a in Plants: Definitions, Timelines, Viewpoints, Open Questions

Contact Info

Product

Resources

About