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

作　　者：Ermes Lo Piccolo Giulia Lauria Giulia Bongi Lucia Guidi Marian Brestic Damiano Remorini Rossano Massai Marco Landi 

机构地区：[1]Department of Agriculture,Food and Environment,University of Pisa,Via del Borghetto 80,52124 Pisa,Italy [2]Centre for Climate Change Impact,CIRSEC,University of Pisa,Via del Borghetto 80,52124 Pisa,Italy [3]Department of Plant Physiology,Slovak University of Agriculture,A.Hlinku 2,Nitra 94976,Slovakia

出　　处：《Journal of Forestry Research》2023年第3期693-704,共12页林业研究（英文版）

摘　　要：Light fl ux and quality are crucial factor for setting endogenous plant circadian rhythms.Evaluating 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/quality.Here,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 cv.Crimson King and Prunus cerasifera var.pissardii)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 L-plants.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 afternoon.Daily fl avonol levels did not vary no notably during the day.In sun-exposed red leaves,anthocyanins partially screened mesophyll cells from incident light,and its levels were similar to the Chl dynamics in the shaded counterparts.This 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 

分 类 号：S718.4[农业科学—林学]