TY - JOUR
T1 - Experimental in vivo measurements of light emission in plants
T2 - A perspective dedicated to David Walker
AU - Kalaji, Hazem M.
AU - Goltsev, Vasilij
AU - Bosa, Karolina
AU - Allakhverdiev, Suleyman I.
AU - Strasser, Reto J.
AU - Govindjee,
N1 - Funding Information:
Acknowledgments This work was supported by grants to one of the authors (Suleyman Allakhverdiev) from the Russian Foundation for Basic Research, the Russian Ministry of Science and Education and the Molecular and Cell Biology Programs of the Russian Academy of Sciences, and by BMBF, Bilateral Cooperation between Germany and Russia. Hazem Kalaji thanks Richard Poole and Paul Davis of Hansatech Instruments Company for supporting him with appropriate literature for this review, and Beniamino Barbieri of ISS Inc. (USA) and David Jameson (University of Hawaii at Manoa, USA) for helping him collect data related to the history of fluorometry and fluorometer development. Govindjee thanks Jawaharlal Nehru University, New Delhi, India, for providing him with a Visiting Professorship in early 2012, where this paper was being finalized; he is highly grateful to George Papageorgiou and Alexandrina Stirbet for reading and commenting on the various drafts of this paper. Vasilij Goltsev thanks the Bulgarian National Science Fund, for financial support. Reto J. Strasser thanks the Swiss National Science Foundation for a 3-year fellowship for advanced scientists and for long-term support of the Bioenergetics Laboratory of the University of Geneva. Since his retirement in 2009, the Weed Research Laboratory at Nanjing Agricultural University (NAU) has regularly supported him as a Chair Professor. Support by the NSF of China is also highly acknowledged by him. As a part time Professor Extra-Ordinarius at the North-West University Potchefstroom 2520 Republic of South Africa, he has had the chance to work with the physiologically best defined and reproducible plants in green houses and optimally regulated open top chambers.
PY - 2012/12
Y1 - 2012/12
N2 - This review is dedicated to David Walker (1928-2012), a pioneer in the field of photosynthesis and chlorophyll fluorescence. We begin this review by presenting the history of light emission studies, from the ancient times. Light emission from plants is of several kinds: prompt fluorescence (PF), delayed fluorescence (DF), thermoluminescence, and phosphorescence. In this article, we focus on PF and DF. Chlorophyll a fluorescence measurements have been used for more than 80 years to study photosynthesis, particularly photosystem II (PSII) since 1961. This technique has become a regular trusted probe in agricultural and biological research. Many measured and calculated parameters are good biomarkers or indicators of plant tolerance to different abiotic and biotic stressors. This would never have been possible without the rapid development of new fluorometers. To date, most of these instruments are based mainly on two different operational principles for measuring variable chlorophyll a fluorescence: (1) a PF signal produced following a pulse-amplitude-modulated excitation and (2) a PF signal emitted during a strong continuous actinic excitation. In addition to fluorometers, other instruments have been developed to measure additional signals, such as DF, originating from PSII, and light-induced absorbance changes due to the photooxidation of P700, from PSI, measured as the absorption decrease (photobleaching) at about 705 nm, or increase at 820 nm. In this review, the technical and theoretical basis of newly developed instruments, allowing for simultaneous measurement of the PF and the DF as well as other parameters is discussed. Special emphasis has been given to a description of comparative measurements on PF and DF. However, DF has been discussed in greater details, since it is much less used and less known than PF, but has a great potential to provide useful qualitative new information on the back reactions of PSII electron transfer. A review concerning the history of fluorometers is also presented.
AB - This review is dedicated to David Walker (1928-2012), a pioneer in the field of photosynthesis and chlorophyll fluorescence. We begin this review by presenting the history of light emission studies, from the ancient times. Light emission from plants is of several kinds: prompt fluorescence (PF), delayed fluorescence (DF), thermoluminescence, and phosphorescence. In this article, we focus on PF and DF. Chlorophyll a fluorescence measurements have been used for more than 80 years to study photosynthesis, particularly photosystem II (PSII) since 1961. This technique has become a regular trusted probe in agricultural and biological research. Many measured and calculated parameters are good biomarkers or indicators of plant tolerance to different abiotic and biotic stressors. This would never have been possible without the rapid development of new fluorometers. To date, most of these instruments are based mainly on two different operational principles for measuring variable chlorophyll a fluorescence: (1) a PF signal produced following a pulse-amplitude-modulated excitation and (2) a PF signal emitted during a strong continuous actinic excitation. In addition to fluorometers, other instruments have been developed to measure additional signals, such as DF, originating from PSII, and light-induced absorbance changes due to the photooxidation of P700, from PSI, measured as the absorption decrease (photobleaching) at about 705 nm, or increase at 820 nm. In this review, the technical and theoretical basis of newly developed instruments, allowing for simultaneous measurement of the PF and the DF as well as other parameters is discussed. Special emphasis has been given to a description of comparative measurements on PF and DF. However, DF has been discussed in greater details, since it is much less used and less known than PF, but has a great potential to provide useful qualitative new information on the back reactions of PSII electron transfer. A review concerning the history of fluorometers is also presented.
KW - Delayed fluorescence
KW - Fluorometers
KW - Photosystem II
KW - Prompt fluorescence
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U2 - 10.1007/s11120-012-9780-3
DO - 10.1007/s11120-012-9780-3
M3 - Review article
C2 - 23065335
AN - SCOPUS:84871609649
VL - 114
SP - 69
EP - 96
JO - Photosynthesis Research
JF - Photosynthesis Research
SN - 0166-8595
IS - 2
ER -