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Diff erences in pigment circadian rhythmicity in greenand red-leafed tree species in the sun and shade

Journal of Forestry Research 2023年第3期34卷 693-704页

作者： Ermes Lo Piccolo giulia Lauria giulia bongi Lucia Guidi Marian Brestic Damiano Remorini Rossano Massai Marco Landi Department of Agriculture Food and EnvironmentUniversity of PisaVia del Borghetto 8052124 PisaItaly Centre for Climate Change Impact CIRSECUniversity of PisaVia del Borghetto 8052124 PisaItaly Department of Plant Physiology Slovak University of AgricultureA.Hlinku 2Nitra 94976Slovakia

Light fl ux and quality are crucial factor for setting endogenous plant circadian *** the daily rhythmicity of leaf chlorophyll content is an eff ective method to monitor the plant physiological endogenous clock in response to environmental signals such as light availability/***,we used a leaf-clip sensor to monitor diurnal rhythms in the content of chlorophyll and fl avonoids such as fl avonols and anthocyanins in three green-(Ailanthus altissima,Tilia platyphyllos and Platanus×acerifolia)and two red-leafed(Acer platanoides *** King and Prunus cerasifera ***)tree species,adapted to sun(L)or shade(S).Signifi cant diff erences in chlorophyll content(Chl)and its variations during the day were observed among treatments in all the analyzed species.S-plants had more Chl than L-plants irrespective of leaf color,and Chl variations were more distinct during the day than in *** particular,contents were lowest in the morning(9:00)and in the middle of the day(at 12:00 and 15:00),and the highest at dusk(21:00).The less evident trends in Chl variation in L-plants were attributed to a decrease in Chl content in high light,which likely masked any increases in the shaded counterparts during the *** fl avonol levels did not vary no notably during the *** sun-exposed red leaves,anthocyanins partially screened mesophyll cells from incident light,and its levels were similar to the Chl dynamics in the shaded *** study provides new bases for further work on endogenous rhythms of plant pigments and improves our understanding of plant physiology in the context of day/night rhythmicity.

关键词： Anthocyanins Chlorophylls Circadian clock Flavonols Shade syndrome

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