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52. Photosystem II photoinhibition and photoprotection in a lycophyte, Selaginella martensii.

Author

Colpo, Andrea, Baldisserotto, Costanza, Pancaldi, Simonetta, Sabia, Alessandra, and Ferroni, Lorenzo

Subjects
PHOTOSYSTEMS, SELAGINELLA, HEAT capacity, ANTENNAS (Electronics), CHLOROPHYLL
Abstract

The Lycophyte Selaginella martensii efficiently acclimates to diverse light environments, from deep shade to full sunlight. The plant does not modulate the abundance of the Light Harvesting Complex II, mostly found as a free trimer, and does not alter the maximum capacity of thermal dissipation (NPQ). Nevertheless, the photoprotection is expected to be modulatable upon long-term light acclimation to preserve the photosystems (PSII, PSI). The effects of long-term light acclimation on PSII photoprotection were investigated using the chlorophyll fluorometric method known as "photochemical quenching measured in the dark" (qPd). Singularly high-qPd values at relatively low irradiance suggest a heterogeneous antenna system (PSII antenna uncoupling). The extent of antenna uncoupling largely depends on the light regime, reaching the highest value in sun-acclimated plants. In parallel, the photoprotective NPQ (pNPQ) increased from deep-shade to high-light grown plants. It is proposed that the differences in the long-term modulation in the photoprotective capacity are proportional to the amount of uncoupled LHCII. In deep-shade plants, the inconsistency between invariable maximum NPQ and lower pNPQ is attributed to the thermal dissipation occurring in the PSII core. [ABSTRACT FROM AUTHOR]

Published
2022
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53. Tempus quaerendi : Nouvelles expériences philologiques dans le domaine de la pensée de l'Antiquité tardive

Author

Collectif, Ferroni, Lorenzo, Collectif, Collectif, Ferroni, Lorenzo, and Collectif

Abstract

Tempus quaerendi. Nouvelles expériences philologiques dans le domaine de la pensée de l’Antiquité tardive, se propose d’exposer les enjeux du travail philologique le plus récent sur la production philosophique de l’époque impériale. La première section se décline en quatre articles sur les problèmes d’édition de textes transmis dans leur intégralité ; suit une deuxième section où trouvent place deux essais consacrés aux recueils de fragments ; les études de la troisième et de la quatrième discutent certains problèmes philologiques relatifs à Plotin et Proclus ; enfin, la cinquième et dernière section propose un regard inédit sur Michel Psellos lecteur de cette tradition philosophique. Si ces travaux ne couvrent qu’une partie des questions qu’il aurait fallu aborder, ils soulignent toutefois la centralité de la méthode philologique dans toute approche des textes des philosophes de l’Antiquité tardive. Ont collaboré au volume : Gerard J. Boter, Tiziano Dorandi, Lorenzo Ferroni, Christian Förstel, Richard Goulet, Pavlos Kalligas, Adrien Lecerf, Concetta Luna, Mariella Menchelli, Federico M. Petrucci, Thomas Riesenweber, Carlos Steel, Daniela P. Taormina, Gerd Van Riel.

Published
2019

54. Ion / Platon ; esquisse sur la tradition textuelle du dialogue, texte critique et notes textuelles par Lorenzo Ferroni ; introduction, traduction et commentaire par Arnaud Macé

Author

Macé, Arnaud, Ferroni, Lorenzo, Logiques de l'Agir ( EA 2274) (LdA), Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), Lorenzo Ferroni, and Logiques de l'Agir ( UR 2274) (LdA)

Subjects
[SHS.PHIL]Humanities and Social Sciences/Philosophy, Platon, ComputingMilieux_MISCELLANEOUS, [SHS]Humanities and Social Sciences
Abstract

International audience

Published
2018

59. Frequently asked questions about chlorophyll fluorescence, the sequel

Author

Universitat Politècnica de València. Departamento de Producción Vegetal - Departament de Producció Vegetal, Kalaji, Hazem, Schansker, Gert, Brestic, M., Bussotti, Filippo, Calatayud, Angeles, Ferroni, Lorenzo, Goltsev, V., Guidi, Lucia, Jajoo, Anjana, Li, P.M., Losciale, P., Mishra, V., Misra, Amarendra, Nebauer, Sergio G., Pancaldi, S., Penella-Casañ, Consuelo, Pollastrini, M., Suresh, K., Tambussi, E., Yanniccari, M., Zivcak, M., Cetner, M., Zamborska, I.A., Stirbet, A., Olsovska, K., Kunderlikova, K., Shelonzek, H., Rusinowski, S., Baba, W., Universitat Politècnica de València. Departamento de Producción Vegetal - Departament de Producció Vegetal, Kalaji, Hazem, Schansker, Gert, Brestic, M., Bussotti, Filippo, Calatayud, Angeles, Ferroni, Lorenzo, Goltsev, V., Guidi, Lucia, Jajoo, Anjana, Li, P.M., Losciale, P., Mishra, V., Misra, Amarendra, Nebauer, Sergio G., Pancaldi, S., Penella-Casañ, Consuelo, Pollastrini, M., Suresh, K., Tambussi, E., Yanniccari, M., Zivcak, M., Cetner, M., Zamborska, I.A., Stirbet, A., Olsovska, K., Kunderlikova, K., Shelonzek, H., Rusinowski, S., and Baba, W.

Abstract

[EN] Using chlorophyll (Chl) a fluorescence many aspects of the photosynthetic apparatus can be studied, both in vitro and, noninvasively, in vivo. Complementary techniques can help to interpret changes in the Chl a fluorescence kinetics. Kalaji et al. (Photosynth Res 122: 121-158, 2014a) addressed several questions about instruments, methods and applications based on Chl a fluorescence. Here, additionalChl a fluorescence-related topics are discussed again in a question and answer format. Examples are the effect of connectivity on photochemical quenching, the correction of F-V/F-M values for PSI fluorescence, the energy partitioning concept, the interpretation of the complementary area, probing the donor side of PSII, the assignment of bands of 77 K fluorescence emission spectra to fluorescence emitters, the relationship between prompt and delayed fluorescence, potential problems when sampling tree canopies, the use of fluorescence parameters in QTL studies, the use of Chl a fluorescence in biosensor applications and the application of neural network approaches for the analysis of fluorescence measurements. The answers draw on knowledge fromdifferent Chl a fluorescence analysis domains, yielding in several cases new insights.

Published
2017

61. Frequently asked questions about chlorophyll fluorescence, the sequel

Author

Kalaji, Hazem M., primary, Schansker, Gert, additional, Brestic, Marian, additional, Bussotti, Filippo, additional, Calatayud, Angeles, additional, Ferroni, Lorenzo, additional, Goltsev, Vasilij, additional, Guidi, Lucia, additional, Jajoo, Anjana, additional, Li, Pengmin, additional, Losciale, Pasquale, additional, Mishra, Vinod K., additional, Misra, Amarendra N., additional, Nebauer, Sergio G., additional, Pancaldi, Simonetta, additional, Penella, Consuelo, additional, Pollastrini, Martina, additional, Suresh, Kancherla, additional, Tambussi, Eduardo, additional, Yanniccari, Marcos, additional, Zivcak, Marek, additional, Cetner, Magdalena D., additional, Samborska, Izabela A., additional, Stirbet, Alexandrina, additional, Olsovska, Katarina, additional, Kunderlikova, Kristyna, additional, Shelonzek, Henry, additional, Rusinowski, Szymon, additional, and Bąba, Wojciech, additional

Published
2016
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71. Frequently asked questions about in vivo chlorophyll fluorescence: practical issues

Author

Universitat Politècnica de València. Escuela Técnica Superior de Ingeniería Agronómica y del Medio Natural - Escola Tècnica Superior d'Enginyeria Agronòmica i del Medi Natural, Kalaji, Hazem M., Schansker, Gert, Ladle, Richard J., Goltsev, Vasilij, Bosa, Karolina, Allakhverdiev, Suleyman I, Brestic, Marian, Bussotti, Filippo, Calatayud, Angeles, Dabrowski, Piotr, Elsheery, Nabil I., Ferroni, Lorenzo, Guidi, Lucia, Hogewoning, Sander W., Jajoo, Anjana, Misra, Amarendra N., González Nebauer, Sergio, Universitat Politècnica de València. Escuela Técnica Superior de Ingeniería Agronómica y del Medio Natural - Escola Tècnica Superior d'Enginyeria Agronòmica i del Medi Natural, Kalaji, Hazem M., Schansker, Gert, Ladle, Richard J., Goltsev, Vasilij, Bosa, Karolina, Allakhverdiev, Suleyman I, Brestic, Marian, Bussotti, Filippo, Calatayud, Angeles, Dabrowski, Piotr, Elsheery, Nabil I., Ferroni, Lorenzo, Guidi, Lucia, Hogewoning, Sander W., Jajoo, Anjana, Misra, Amarendra N., and González Nebauer, Sergio

Abstract

[EN] The aim of this educational review is to provide practical information on the hardware, methodology, and the hands on application of chlorophyll (Chl) a fluorescence technology. We present the paper in a question and answer format like frequently asked questions. Although nearly all information on the application of Chl a fluorescence can be found in the literature, it is not always easily accessible. This paper is primarily aimed at scientists who have some experience with the application of Chl a fluorescence but are still in the process of discovering what it all means and how it can be used. Topics discussed are (among other things) the kind of information that can be obtained using different fluorescence techniques, the interpretation of Chl a fluorescence signals, specific applications of these techniques, and practical advice on different subjects, such as on the length of dark adaptation before measurement of the Chl a fluorescence transient. The paper also provides the physiological background for some of the applied procedures. It also serves as a source of reference for experienced scientists

Published
2014

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