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Intraspecific Variation Within the Utricularia Amethystina Species

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Intraspecific Variation Within the Utricularia Amethystina Species International Journal of Molecular Sciences Article Intraspecific Variation within the Utricularia amethystina Species Morphotypes Based on Chloroplast Genomes Saura R. Silva 1,* , Daniel G. Pinheiro 1, Helen A. Penha 1, Bartosz J. Płachno 2 , Todd P. Michael 3, Elliott J. Meer 4, Vitor F. O. Miranda 5,* and Alessandro M. Varani 1,* 1 Departamento de Tecnologia, Faculdade de Ciências Agrárias e Veterinárias, Jaboticabal, Universidade Estadual Paulista (Unesp), Sao Paulo 14884-900, Brazil; [email protected] (D.G.P.); [email protected] (H.A.P.) 2 Department of Plant Cytology and Embryology, Institute of Botany, Faculty of Biology, Jagiellonian University in Kraków, 30-387 Krakow, Poland; [email protected] 3 J. Craig Venter Institute, La Jolla, CA 92037, USA; [email protected] 4 10X Genomics, Pleasanton, CA 94566, USA; [email protected] 5 Departamento de Biologia Aplicada à Agropecuária, Faculdade de Ciências Agrárias e Veterinárias, Jaboticabal, Universidade Estadual Paulista (Unesp), Sao Paulo 14884-900, Brazil * Correspondence: [email protected] (S.R.S.); [email protected] (V.F.O.M.); [email protected] (A.M.V.) Received: 18 October 2019; Accepted: 27 November 2019; Published: 5 December 2019 Abstract: Utricularia amethystina Salzm. ex A.St.-Hil. & Girard (Lentibulariaceae) is a highly polymorphic carnivorous plant taxonomically rearranged many times throughout history. Herein, the complete chloroplast genomes (cpDNA) of three U. amethystina morphotypes: purple-, white-, and yellow-flowered, were sequenced, compared, and putative markers for systematic, populations, and evolutionary studies were uncovered. In addition, RNA-Seq and RNA-editing analysis were employed for functional cpDNA evaluation. The cpDNA of three U. amethystina morphotypes exhibits typical quadripartite structure. Fine-grained sequence comparison revealed a high degree of intraspecific genetic variability in all morphotypes, including an exclusive inversion in the psbM and petN genes in U. amethystina yellow. Phylogenetic analyses indicate that U. amethystina morphotypes are monophyletic. Furthermore, in contrast to the terrestrial Utricularia reniformis cpDNA, the U. amethystina morphotypes retain all the plastid NAD(P)H-dehydrogenase (ndh) complex genes. This observation supports the hypothesis that the ndhs in terrestrial Utricularia were independently lost and regained, also suggesting that different habitats (aquatic and terrestrial) are not related to the absence of Utricularia ndhs gene repertoire as previously assumed. Moreover, RNA-Seq analyses recovered similar patterns, including nonsynonymous RNA-editing sites (e.g., rps14 and petB). Collectively, our results bring new insights into the chloroplast genome architecture and evolution of the photosynthesis machinery in the Lentibulariaceae. Keywords: Utricularia amethystina; Lentibulariaceae; chloroplast phylogenomics; organelle genome; carnivorous plants; polymorphic species; intraspecific variation; ndh genes 1. Introduction The species of the carnivorous plant family Lentibulariaceae are grouped in three genera: Pinguicula L., Genlisea A.St-Hil., and Utricularia L. [1,2], and are increasingly becoming important plant models mainly due to their alternative nutrient uptake system, their morphological non-orthodox body Int. J. Mol. Sci. 2019, 20, 6130; doi:10.3390/ijms20246130 www.mdpi.com/journal/ijms Int. J. Mol. Sci. 2019, 20, x FOR PEER REVIEW 2 of 20 characteristics, such as high mutational levels with nuclear genome shrinkage and expansion in some lineages [5,6]. Utricularia is the biggest genus and most widespread group of carnivorous plants and is very diverse regarding its distribution and habit (e.g., terrestrial, aquatic, lithophytes, epiphytes, and reophytes) [7]. Moreover, several species are polymorphic, which may lead to controversial taxonomic classification. For instance, Utricularia amethystina Salzm. ex A.St.-Hil. & Girard is a terrestrial herb, with petiolate and rosetted leaves. The species is broadly distributed in about 18 different countries of the tropical and subtropical America [7], commonly found in different altitudes (from inselbergs in the Guianas [8] to the coast of Brazil [9]) and habitats such as humid sandy soil of the savannas, swamps, and soil between rocks usually near streams, rivers, and waterfalls. The species is classified in the Utricularia sect. Foliosa Kamieński, showing common morphological characteristics making it easy to distinguish from other Utricularia sections due to its connate bracts and bracteoles, which is the singular morphology of utricles (carnivorous traps), and theInt. J.capsule Mol. Sci. 2019 dorsoventrally, 20, 6130 and bivalvate dehiscence. However, the distinction between2 ofthe 19 conspecific species is not a trivial task, as U. amethystina shows high intraspecific variation, mainly between reproductive characters, such as the corolla shapes and colors, which can vary from shades ofstructure, purple (Figure characterized 1A), white by Fuzzy (Figure Arberian 1B) to yellow Morphology (Figure [3 1C),4], and[7]. particular genomic characteristics, suchThis as high intraspecific mutational morphological levels with nuclear variation genome result shrinkageed in several and expansiontaxonomic inrearrangements some lineages [since5,6]. the earliestUtricularia descriptionsis the biggest at nineteenth genus and century most [1 widespread0,11] and even group now of there carnivorous is much controversy plants and is about very ifdiverse the species regarding is one its or distribution more [12,13]. and Taylor habit (1989) (e.g., terrestrial,[7] struggled aquatic, to separate lithophytes, the species epiphytes, based and on reproductivereophytes) [7]. characters, Moreover, severalsuch as species corolla are shape, polymorphic, pedicel sizes, which palynological may lead to controversial characters, taxonomicand calyx indumentum,classification. Forbut instance,he couldn’tUtricularia find traits amethystina for enoughSalzm. taxonomical ex A.St.-Hil. circumscriptions & Girard is a terrestrial to split herb, the withdifferent petiolate morphotypes. and rosetted Indeed, leaves. in The his speciesUtricularia is broadly taxonomic distributed monograph, in about he 18 synonymized different countries 31 taxa of underthe tropical the binomial and subtropical “Utricularia America amethystina [7], commonly” and he found wrote in “ diU.fferent amethystina altitudes is (froma most inselbergs ‘difficult’ in and the excessivelyGuianas [8] polymorphic to the coast of species...” Brazil [9]) (Taylor, and habitats 1989 [7], such p. as291). humid Therefore, sandy soilhe assumed of the savannas, one name swamps, for the species,and soil as between he was rocks unable usually to find near discontinuities streams, rivers, to support and waterfalls. taxa separation due to the high degree of polymorphismThe species between is classified populations. in the Utricularia However,sect. toFoliosa date,Kamie´nski,showing there is no proper taxonomic common morphological treatment to solvecharacteristics this question. making In addition, it easy to only distinguish a few genetic from other differencesUtricularia havesections been explored due to its [13], connate such bractsas the chloroplastand bracteoles, regions which rps16, isthe trnL-F, singular trnD-T, morphology and nuclear of utriclesITS, but (carnivorousthese markers traps), were andnot able the capsuleto give enoughdorsoventrally resolution and bivalvateto distinguish dehiscence. them However,all. In this the context, distinction chloroplast between genomes the conspecific are a speciesvaluable is resourcenot a trivial for task, phylogenies, as U. amethystina and theshows study high of intraspecifictheir structure variation, and content mainly can between provide reproductive clues for improvingcharacters, inter- such asand the intraspecific corolla shapes studies, and colors,such as whichpopulation can vary biology from [14], shades and ofeven purple the discovery (Figure1A), of whitenew species (Figure [15].1B) to yellow (Figure1C) [7]. Figure 1. Utricularia amethystina speciesspecies morphotypes morphotypes are are differentiated differentiated mainly mainly by by corolla corolla color. ( (AA)) U. amethystina purple morphotype; ( B) U. amethystina white morphotype; ( C) U. amethystina yellow morphotype. TheThis chloroplast intraspecific genomes morphological of most angiosperms variation resulted have conserved in several quadripartite taxonomic rearrangements structure separated since inthe Large earliest and descriptions Small Single at nineteenthCopy regions century (LSC [10 and,11 ]SSC, and evenrespectively) now there and is muchtwo inverted controversy repetitive about regionsif the species (IRs) [16]. is one However, or more comparative [12,13]. Taylor analyses (1989) indicate [7] struggled that some to separate plants, such the species as parasitic based [17], on reproductive characters, such as corolla shape, pedicel sizes, palynological characters, and calyx indumentum, but he couldn’t find traits for enough taxonomical circumscriptions to split the different morphotypes. Indeed, in his Utricularia taxonomic monograph, he synonymized 31 taxa under the binomial “Utricularia amethystina” and he wrote “U. amethystina is a most ‘difficult’ and excessively polymorphic species...” (Taylor, 1989 [7], p. 291). Therefore, he assumed one name for the species, as he was unable to find discontinuities to support taxa separation due to the high degree of polymorphism between populations.
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