{"title":"Colour shifts and photoprotection: how the common haircap moss (<i>Polytrichum commune</i>) adapts to sun and shade.","authors":"Hiromitsu Nakajima","doi":"10.1071/FP24335","DOIUrl":null,"url":null,"abstract":"<p><p>Polytrichum commune exhibits distinct green and yellow-green colouration in shaded and sunny environments, respectively. This study investigates the physiological adaptations underlying this colour shift, focusing on pigment composition and photoprotection. Chlorophyll and carotenoid concentrations, carotenoid:chlorophyll ratios (CAR/CHL), electron transport rates (ETR), and non-photochemical quenching (NPQ) were analysed in samples collected from shaded and sunny conditions, along with a shade-to-sun experiment. Results revealed higher CAR/CHL ratios in sunny samples, facilitating enhanced NPQ and photoprotection. Changing light conditions of the moss from shade to sun increased CAR/CHL (by 1.2 times) and NPQ (by 2.2 times), while reducing chlorophyll and carotenoid levels. These physiological changes correlated with the observed colour shift to yellow-green. The study confirmed that light intensity, not temperature or humidity, drives this response. Additionally, the lamellae structure of P. commune leaves supports efficient gas exchange and photosynthesis under varying light conditions. These findings highlight the adaptive strategies of bryophytes to environmental stress, enhancing our understanding of plant resilience mechanisms. Insights from this research may contribute to broader ecological and physiological studies on light adaptations in plants.</p>","PeriodicalId":12483,"journal":{"name":"Functional Plant Biology","volume":"52 ","pages":""},"PeriodicalIF":2.7000,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Functional Plant Biology","FirstCategoryId":"99","ListUrlMain":"https://doi.org/10.1071/FP24335","RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PLANT SCIENCES","Score":null,"Total":0}
引用次数: 0
Abstract
Polytrichum commune exhibits distinct green and yellow-green colouration in shaded and sunny environments, respectively. This study investigates the physiological adaptations underlying this colour shift, focusing on pigment composition and photoprotection. Chlorophyll and carotenoid concentrations, carotenoid:chlorophyll ratios (CAR/CHL), electron transport rates (ETR), and non-photochemical quenching (NPQ) were analysed in samples collected from shaded and sunny conditions, along with a shade-to-sun experiment. Results revealed higher CAR/CHL ratios in sunny samples, facilitating enhanced NPQ and photoprotection. Changing light conditions of the moss from shade to sun increased CAR/CHL (by 1.2 times) and NPQ (by 2.2 times), while reducing chlorophyll and carotenoid levels. These physiological changes correlated with the observed colour shift to yellow-green. The study confirmed that light intensity, not temperature or humidity, drives this response. Additionally, the lamellae structure of P. commune leaves supports efficient gas exchange and photosynthesis under varying light conditions. These findings highlight the adaptive strategies of bryophytes to environmental stress, enhancing our understanding of plant resilience mechanisms. Insights from this research may contribute to broader ecological and physiological studies on light adaptations in plants.
期刊介绍：
Functional Plant Biology (formerly known as Australian Journal of Plant Physiology) publishes papers of a broad interest that advance our knowledge on mechanisms by which plants operate and interact with environment. Of specific interest are mechanisms and signal transduction pathways by which plants adapt to extreme environmental conditions such as high and low temperatures, drought, flooding, salinity, pathogens, and other major abiotic and biotic stress factors. FPB also encourages papers on emerging concepts and new tools in plant biology, and studies on the following functional areas encompassing work from the molecular through whole plant to community scale. FPB does not publish merely phenomenological observations or findings of merely applied significance.
Functional Plant Biology is published with the endorsement of the Commonwealth Scientific and Industrial Research Organisation (CSIRO) and the Australian Academy of Science.
Functional Plant Biology is published in affiliation with the Federation of European Societies of Plant Biology and in Australia, is associated with the Australian Society of Plant Scientists and the New Zealand Society of Plant Biologists.
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