Does Continuous Lighting Induce Premature Leaf Senescence?

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Abstract

using 6 species of aboriginal (Geranium sylvaticum, Geum rivale, Potentilla erecta) and introduced (Geranium himalayense, Geum coccineum, Potentilla atrosanguinea) plants of the Subarctic, it was shown that under continuous lighting (CL) in climate chambers (at constant temperature, humidity, light intensity and spectral composition), plants exhibit a complex of physiological and biochemical changes similar to those that occur during natural leaf aging in nature, namely, the loss of chlorophyll and carotenoids with an increase in the chlorophyll a/b ratio and a decrease in the chlorophyll/carotenoid ratio, a decrease in Fv/Fm values, an increase in the content of anthocyanins, hydrogen peroxide and lipid peroxidation products. Based on the data presented in this work and previously obtained data, as well as an analysis of the literature, it was concluded that CL is not a factor inducing the senescence, as some authors suggest, but, like other stressors, causes numerous changes and disturbances in sensitive species, some of which are similar to those observed during natural aging of leaves.

About the authors

T. G Shibaeva

Institute of Biology, Karelian Research Center, Russian Academy of Science

Email: shibaeva@krc.karelia.ru
ORCID iD: 0000-0003-1287-3864
Dr. Sci. (Biology), Leading Researcher Petrozavodsk, Russian Federation

A. A Rubaeva

Institute of Biology, Karelian Research Center, Russian Academy of Science

Email: arubaeva@krc.karelia.ru
ORCID iD: 0000-0002-7772-2760
PhD Student Petrozavodsk, Russian Federation

E. G Sherudilo

Institute of Biology, Karelian Research Center, Russian Academy of Science

Email: sherudil@krc.karelia.ru
ORCID iD: 0000-0001-7168-8226
PhD in Biology, Senior Researcher Petrozavodsk, Russian Federation

I. A Levkin

Institute of Biology, Karelian Research Center, Russian Academy of Science

Email: levkin-556@mail.ru
PhD student Petrozavodsk, Russian Federation

A. F Titov

Institute of Biology, Karelian Research Center, Russian Academy of Science

Email: titov@krc.karelia.ru
ORCID iD: 0000-0001-6880-2411
Dr. Sci. (Biology), Corresponding Member of the Russian Academy of Sciences, Chief Researcher Petrozavodsk, Russian Federation

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