Fluorescence quenching in the lichen Peltigera aphthosa due to desiccation

Maksimov, E.G.; Schmitt, F.J.; Tsoraev, G.V.; Ryabova, A.V.; Friedrich, T.; Paschenko, V.Z.

Статья опубликована в высокорейтинговом журнале

Информация о цитировании статьи получена из Web of Science, Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 26 ноября 2014 г.

Авторы: Maksimov E.G., Schmitt F.J., Tsoraev G.V., Ryabova A.V., Friedrich T., Paschenko V.Z.
Журнал: Plant Physiology and Biochemistry
Том: 81
Год издания: 2014
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Первая страница: 67
Последняя страница: 73
DOI: 10.1016/j.plaphy.2014.01.005
Аннотация: Photoprotective mechanisms were studied on the tripartite lichen Peltigera aphthosa that exhibits external cephalodia. Using the methods of steady-state and time-resolved fluorescence microscopy, we studied the dynamics of the rehydration process in different parts of the lichen thalli. It was found that apical, medial and basal parts of the thallus are not only morphologically different, but also show completely different chlorophyll induction curves and other spectral characteristics. In dry state, significant contribution to the fluorescence spectrum of lichen gives a green fluorescence of hyphae forming the upper crust, which is rapidly and almost completely quenched during the rehydration process. Probably this is one of the protective mechanisms that reduce the amount of light reaching the PS II reaction centers in the dry state. In the process of rehydration, we observed an increase in the intensity of the chlorophyll fluorescence of the photobiont at 680 nm, with significant changes of the fluorescence lifetimes and the amplitude ratios of fast and slow components of fluorescence decay kinetics. While in dry state, chlorophyll fluorescence is strongly quenched (opposite to the fluorescence of the hyphae), and the fluorescence time constants recover to the typical decay times of active photosynthetic organisms during rehydration. The quantitative behavior of these changes differs largely between the apical, medial and basal parts of the thallus, probably due to the complex interactions of the fungus, algae and cyanobacteria.
Добавил в систему: Цораев Георгий Витальевич

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Fluorescence quenching in the lichen Peltigera aphthosa due to desiccationстатья

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