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The First Complete Chloroplast Genome of the Genistoid Legume

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The First Complete Chloroplast Genome of the Genistoid Legume Annals of Botany 113: 1197–1210, 2014 doi:10.1093/aob/mcu050, available online at www.aob.oxfordjournals.org The first complete chloroplast genome of the Genistoid legume Lupinus luteus: evidence for a novel major lineage-specific rearrangement and new insights regarding plastome evolution in the legume family Guillaume E. Martin1,†‡, Mathieu Rousseau-Gueutin1,†, Solenn Cordonnier1, Oscar Lima1, Sophie Michon-Coudouel2, Delphine Naquin1,§, Julie Ferreira de Carvalho1, Malika Aı¨nouche1, Armel Salmon1 and Abdelkader Aı¨nouche1,* 1UMR CNRS 6553 Ecobio, OSUR (Observatoire des Sciences de l’Univers de Rennes), Universite´ de Rennes 1/Universite´ Europe´enne de Bretagne, 35 042 Rennes, France and 2Plate-forme Ge´nomique Environnementale et Fonctionnelle, OSUR-CNRS, Universite´ de Rennes 1, 35042 Rennes, France †These two authors contributed equally to this work Downloaded from ‡Present address: CIRAD (Centre de coope´ration Internationale en Recherche Agronomique pour le De´veloppement), UMR AGAP, F-34398 Montpellier, France §Present address: Plate-forme IMAGIF, FRC3115 CNRS, 91198 Gif sur Yvette Cedex, France * For correspondence. E-mail [email protected] Received: 10 December 2013 Returned for revision: 3 February 2014 Accepted: 26 February 2014 Published electronically: 25 April 2014 http://aob.oxfordjournals.org/ † Background and Aims To date chloroplast genomes are available only for members of the non-protein amino acid- accumulating clade (NPAAA) Papilionoid lineages in the legume family (i.e. Millettioids, Robinoids and the ‘inverted repeat-lacking clade’, IRLC). It is thus very important to sequence plastomes from other lineages in order to better understand the unusual evolution observed in this model flowering plant family. To this end, the plas- tome of a lupine species, Lupinus luteus, was sequenced to represent the Genistoid lineage, a noteworthy but poorly studied legume group. † Methods The plastome of L. luteus was reconstructed using Roche-454 and Illumina next-generation sequencing. Its structure, repetitive sequences, gene content and sequence divergence were compared with those of other at CIRAD-DIC on March 17, 2016 Fabaceae plastomes. PCR screening and sequencing were performed in other allied legumes in order to determine the origin of a large inversion identified in L. luteus. † Key Results The first sequenced Genistoid plastome (L. luteus: 155 894 bp) resulted in the discovery of a 36-kb inversion, embedded within the already known 50-kb inversion in the large single-copy (LSC) region of the Papilionoideae. This inversion occurs at the base or soon after the Genistoid emergence, and most probably resulted from a flip–flop recombination between identical 29-bp inverted repeats within two trnS genes. Comparative analyses of the chloroplast gene content of L. luteus vs. Fabaceae and extra-Fabales plastomes revealed the loss of the plastid rpl22 gene, and its functional relocation to the nucleus was verified using lupine transcriptomic data. An investigation into the evolutionary rate of coding and non-coding sequences among legume plastomes resulted in the identification of remarkably variable regions. † Conclusions This study resulted in the discovery of a novel, major 36-kb inversion, specific to the Genistoids. Chloroplast mutational hotspots were also identified, which contain novel and potentially informative regions for molecular evolutionary studies at various taxonomic levels in the legumes. Taken together, the results provide new insights into the evolutionary landscape of the legume plastome. Key words: Lupinus luteus, European yellow lupine, legume, Genistoid clade, chloroplast genome evolution, structural plastid rearrangement, 36-kb inversion, inverted repeats, flip–flop recombination, lineage-specific marker, functional gene transfer, Papilionoidae, repeated plastid sequences, sequence divergence, plastome hotspots, Fabaceae phylogeny. INTRODUCTION Papilionoideae (Wojciechowski et al., 2004; Cardoso et al., 2012). The Papilionoideae is divided into six major clades: the Legumes (Fabaceae) are the third largest angiosperm family, Genistoids, Dalbergioids, Mirbelioids, Millettioids, Robinioids with 727 genera and about 20 000 species (Lewis et al., 2005). and the inverted repeat lacking clade (IRLC) (Cronk et al., They are characterized by a wide biological and ecological 2006). Within the Genistoids, Lupinus displays particular func- diversity (Cronk et al., 2006), and they are of great economic im- tional properties compared with other legumes, such as active ni- portance, particularly for human consumption or as animal trogen metabolism and the production of allelopathic substances forage. This family is composed of two main groups (Fig. 1): of ecological and agronomical interest (Guillon and Champ, Caesalpinioideae sensu lato (s.l.; including Mimosoideae) and 2002; Magni et al., 2004; Pilvi et al., 2006). Additionally, # The Author 2014. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: [email protected] 1198 Martin et al. — Lineage-specific inversion and insights into legume plastome evolution Basal legumes (incl. Cercideae) Caesalpinioid crown clade (incl. Mimosoids) ADA clade Swartzoid clade Cladrastis clade Lecointoid clade Papilionoid legumes Vateroid clade Andira clade Ormosia clade Downloaded from Brongniartieae clade sensu clade 50-kb Core Genistoid clade inversion clade lato Genistoid Bowdichia clade http://aob.oxfordjournals.org/ Dalbergioid clade Baphioid clade Mirbelioid clade Millettioids at CIRAD-DIC on March 17, 2016 NPAAA clade Robinioids IRLC F IG. 1. Simplified phylogenetic tree representing the main clades circumscribed in the legume family [redrawn from Wojciechowski et al. (2004) and Cardoso et al. (2012)]. Filled triangles indicate lineages for which one or more whole chloroplast genome sequences are available, whereas open triangles indicate lineages for which no plastome sequence exists, including the core Genistoid clade (boxed) targeted in this study. Lupinus is the only known legume that does not form mycor- fewer genes. Most of these rare chloroplastic gene losses occurred rhizal symbioses (Sprent, 2007). Theyalso have considerable po- in species whose plastomes are highly rearranged relative to the tential for phytoremediation due to their ability to metabolize ancestral angiosperm plastome (Jansen et al., 2007). Since the nitrogen pollutants such as atrazine (Garcinuno et al., 2003). emergence of the Fabaceae, there has been loss of five different Plastome organization is highly conserved among most flower- chloroplastic genes: accD, psaI, rpl23, rps16 and ycf4 (Jansen ingplants(JansenandRuhlman, 2012), most havinga quadripartite et al.,2007; Magee et al., 2010). It is very likely that the genes structure composed of two copies of an inverted repeat (IR) sepa- lost from the plastome were previously functionally transferred rated by large and small single-copy regions (LSC and SSC). to the nucleus or replaced by a nuclear gene of prokaryotic or However, a few angiosperm families, including the Fabaceae, eukaryotic origin. For example, the chloroplast accD gene was present an unusual plastome structure and evolution. In this functionally transferred to the nucleus in Trifolium species family, the loss of one IR in the Papilionoideae (Wojciechowski (Magee et al., 2010) and the plastidic rps16 gene was functionally et al., 2004), the presence of many repetitive sequences (Saski replaced by a nuclear-encoded rps16 gene of mitochondrial origin et al.,2005; Magee et al., 2010), the occurrence of relatively in Medicago truncatula (Ueda et al., 2008). large inversions (Palmer and Herbon, 1988; Perry et al.,2002; During the last decade, knowledge of the organization and Magee et al.,2010) and the presence of a localized hypermutable evolution of legume plastomes has rapidly expanded with the de- region (Magee et al., 2010) have been detected. Aberrant DNA velopment of next-generation sequencing (NGS) technologies. repair was inferred as a possible cause for these plastomic rearran- Ten legume plastomes have now been sequenced: Cicer arietinum gements and accelerated rates of nucleotide substitutions (Jansen (Jansen et al., 2008), Glycine max (Saski et al.,2005), Lathyrus et al.,2007). sativus (Magee et al., 2010), Lotus japonicus (Kato et al.,2000), Although most photosynthetic angiosperm plastomes contain M. truncatula (NC_003119), Millettia pinnata (Kazakoff et al., 79 protein-coding genes, various derived lineages exhibit slightly 2012), Phaseolus vulgaris (Guo et al.,2007), Pisum sativum Martin et al. — Lineage-specific inversion and insights into legume plastome evolution 1199 (Magee et al., 2010),Trifolium subterraneum (Cai et al., 2008)and natural population of Lupinus luteus collected at Bou Tlelis, Vigna radiata (Tangphatsornruang et al., 2010). The sequencing of Oran in Algeria, North Africa. DNA extraction was performed these plastomes confirmed previous observations of major rearran- using a NucleoSpinw Plant II kit (Macherey Nagel) following gements in this family, including a 50-kb inversion present in most the manufacturer’s instructions.The genomicDNAwassubjected papilionoids (Palmer and Thompson 1982; Lavin et al., 1990; to two high-throughput methods of sequencing: one run using Doyle et al., 1996; Wojciechowski et al.,2004; Jansen et al., pyrosequencingwith the GS-FLX (454 LifeScience, Roche) plat- 2008) and the loss of one copy of the IR region in one of the papi-
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