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On Flavonoid Accumulation in Different Plant Parts: Variation Patterns Among Individuals and Populations in the Shore Campion (Silene Littorea) José C

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On Flavonoid Accumulation in Different Plant Parts: Variation Patterns Among Individuals and Populations in the Shore Campion (Silene Littorea) José C Santa Clara University Scholar Commons Biology College of Arts & Sciences 10-29-2015 On flavonoid accumulation in different plant parts: variation patterns among individuals and populations in the shore campion (Silene littorea) José C. del Valle Mª Luisa Buide Inés Casimiro-Soriguer Justen B. Whittall Santa Clara University, [email protected] Eduardo Narbona Follow this and additional works at: http://scholarcommons.scu.edu/bio Part of the Biology Commons, and the Plant Sciences Commons Recommended Citation Valle, D., C, J., Buide, M. L., Casimiro-Soriguer, I., Whittall, J. B., & Narbona, E. (2015). On flavonoid accumulation in different plant parts: variation patterns among individuals and populations in the shore campion (Silene littorea). Frontiers in Plant Science, 6. https://doi.org/10.3389/fpls.2015.00939 Copyright © 2015 del Valle, Buide, Casimiro-Soriguer, Whittall and Narbona. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. This Article is brought to you for free and open access by the College of Arts & Sciences at Scholar Commons. It has been accepted for inclusion in Biology by an authorized administrator of Scholar Commons. For more information, please contact [email protected]. ORIGINAL RESEARCH published: 29 October 2015 doi: 10.3389/fpls.2015.00939 On flavonoid accumulation in different plant parts: variation patterns among individuals and populations in the shore campion (Silene littorea) José C. del Valle 1*,M a L. Buide 1, Inés Casimiro-Soriguer 1, Justen B. Whittall 2 and Eduardo Narbona 1 1 Área de Botánica, Departamento de Biología Molecular e Ingeniería Bioquímica, Universidad Pablo de Olavide, Seville, Spain, 2 Department of Biology, College of Arts and Sciences, Santa Clara University, Santa Clara, CA, USA The presence of anthocyanins in flowers and fruits is frequently attributed to attracting pollinators and dispersers. In vegetative organs, anthocyanins and other non-pigmented flavonoids such as flavones and flavonols may serve protective functions against UV radiation, cold, heat, drought, salinity, pathogens, and herbivores; thus, these compounds are usually produced as a plastic response to such stressors. Although, the independent accumulation of anthocyanins in reproductive and vegetative tissues is Edited by: Kevin Davies, commonly postulated due to differential regulation, the accumulation of flavonoids within New Zealand Institute for Plant and and among populations has never been thoroughly compared. Here, we investigated the Food Research, New Zealand shore campion (Silene littorea, Caryophyllaceae) which exhibits variation in anthocyanin Reviewed by: Kathrin Schrick, accumulation in its floral and vegetative tissues. We examined the in-situ accumulation of Kansas State University, USA flavonoids in floral (petals and calyxes) and vegetative organs (leaves) from 18 populations Anton R. Schäffner, representing the species’ geographic distribution. Each organ exhibited considerable Helmholtz Zentrum München, Germany variability in the content of anthocyanins and other flavonoids both within and among *Correspondence: populations. In all organs, anthocyanin and other flavonoids were correlated. At the plant José C. del Valle level, the flavonoid content in petals, calyxes, and leaves was not correlated in most [email protected] of the populations. However, at the population level, the mean amount of anthocyanins Specialty section: in all organs was positively correlated, which suggests that the variable environmental This article was submitted to conditions of populations may play a role in anthocyanin accumulation. These results are Plant Metabolism and Chemodiversity, a section of the journal unexpected because the anthocyanins are usually constitutive in petals, yet contingent Frontiers in Plant Science to environmental conditions in calyxes and leaves. Anthocyanin variation in petals may Received: 28 July 2015 influence pollinator attraction and subsequent plant reproduction, yet the amount of Accepted: 16 October 2015 anthocyanins may be a direct response to environmental factors. In populations on the Published: 29 October 2015 west coast, a general pattern of increasing accumulation of flavonoids toward southern Citation: del Valle JC, Buide M aL, latitudes was observed in calyxes and leaves. This pattern corresponds to a gradual Casimiro-Soriguer I, Whittall JB and increase of UV-B radiation and temperature, and a decrease of rainfall toward the south. Narbona E (2015) On flavonoid However, populations along the southern coast exposed to similar climatic stressors accumulation in different plant parts: variation patterns among individuals showed highly variable flavonoid contents, implying that other factors may play a role in and populations in the shore campion flavonoid accumulation. (Silene littorea). Front. Plant Sci. 6:939. Keywords: anthocyanins, Caryophyllaceae, coastal dune ecosystem, flavones, flavonols, flower color, plasticity, doi: 10.3389/fpls.2015.00939 intra- and inter-population variation Frontiers in Plant Science | www.frontiersin.org 1 October 2015 | Volume 6 | Article 939 del Valle et al. Population patterns of flavonoid accumulation INTRODUCTION elucidated in several species (Albert et al., 2014), confirmation of the independent accumulation of anthocyanins and other Flavonoids are secondary metabolites common to angiosperms, flavonoids in different parts of plants in the field remains limited which confer a variety of biological functions (Gould and Lister, (but see Koski and Ashman, 2015). 2006; Agati et al., 2012). Anthocyanins, a group of flavonoids, Because most flavonoids are plastically produced as an are synthesized in the anthocyanin biosynthetic pathway (ABP), acclimation process to environmental stressors (Manetas, 2006; a highly conserved route of flavonoid biosynthesis. Branches of Albert et al., 2011; Anderson et al., 2013; Hectors et al., the ABP may lead to important groups of metabolites such as 2014), individuals in different populations exposed to varying aurones, chalcones, flavones or flavonols (Davies and Schwinn, environmental conditions usually show variable accumulation of 2006; Saito et al., 2013). Anthocyanins show a variety of colors flavonoids (Jaakola and Hohtola, 2010). Environmental factors from blue to red, but their flavonoid intermediates are largely (temperature, precipitation, solar radiation, etc.) in populations colorless, with the exception of aurones and chalcones that are throughout the species distribution area are often subjected to yellow or pale- yellow (Tanaka et al., 2008). The accumulation latitudinal, longitudinal, or altitudinal gradients (Narbona et al., of anthocyanins in flowers or fruits is commonly related to 2010; Arista et al., 2013; Prendeville et al., 2013); thus, flavonoid pollinator attraction and seed/fruit dispersers (Schaefer and accumulation may show geographic clines. For instance, Ruxton, 2011). However, in vegetative organs, anthocyanins and flavonoid content in fruits of two species of Vaccinium showed flavonols may perform a variety of functional roles in response a geographical gradient, with higher amounts of flavonoids to biotic and abiotic stressors such as UV radiation, cold, heat, in northern latitudes, probably due to the length of the day drought, salinity, herbivory, pathogens, etc. (Chalker-Scott, 1999; (Lätti et al., 2008, 2010). Flavonoid contents in Betula pubescens Falcone Ferreyra et al., 2012; Narbona et al., 2014). In flowers, leaves were positively correlated with latitude (Stark et al., anthocyanin expression is generally constitutive and honed by 2008). In European populations of Plantago lanceolata, latitude the preferences of pollinators and the light environment (Fenster and altitude have a strong influence on the accumulation of et al., 2004; Schiestl and Johnson, 2013). Conversely, in vegetative anthocyanins in inflorescences, suggesting that these geographic tissues, anthocyanins and other flavonoids usually accumulate effects are caused by the local thermal environment (Lacey transiently, as a plastic response to biotic or abiotic stressors et al., 2010). Recently, it has been demonstrated that plants (Manetas, 2006; Hatier and Gould, 2009). of Argentina anserina showed an increased pattern of floral Plants can differentially regulate anthocyanins in various pigmentation (UV-absorbing flavonoids) in populations at tissues, organs and cell-types. Therefore, species with lower latitudes in both hemispheres (Koski and Ashman, anthocyanin-pigmented flowers may or may not accumulate 2015), which confirms an analogous hypothesis for animals, anthocyanins in vegetative tissues (e.g., Wheldale, 1916; Streisfeld of increased pigmentation toward equatorial latitudes (Lincoln and Kohn, 2005), and the same with anthocyanin accumulation et al., 1998). Thus, analyzing flavonoid accumulation in a variety in stems and leaves (e.g., Gould et al., 2010; Hughes et al., 2010). of populations subjected to climatic gradients may be useful to Their production can be variable among cells within the same identify potential environmental factors influencing anthocyanin tissue. This is the case of variegated flowers or flowers with production (Santamaría
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