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César S.B. Costa1,4, Gudrun Kadereit2 & Gabriela Peres Moraes

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César S.B. Costa1,4, Gudrun Kadereit2 & Gabriela Peres Moraes Rodriguésia 70: e03122017. 2019 http://rodriguesia.jbrj.gov.br DOI: http://dx.doi.org/10.1590/2175-7860201970039 Original Paper / Artigo Original Molecular markers indicate the phylogenetic identity of southern Brazilian sea asparagus: first record of Salicornia neei in Brazil César S.B. Costa1,4, Gudrun Kadereit2 & Gabriela Peres Moraes de Freitas3 Abstract Molecular phylogenetic analyses based on ETS, ITS and atpB-rbcL spacer sequences assessed the phylogenetic status of the southern Brazil sea asparagus species of the genus Salicornia (Salicornioideae, Amaranthaceae). Accessions of Patos Lagoon estuary (32° S) were obtained from wild plants and two pure line lineages, selected from contrasting prostrate (BTH1) and decumbent (BTH2) ecomorphotypes found locally. Patos Lagoon wild plants, BTH1 and BTH2 f4 progenies showed 100% identical sequences for the atpB-rbcL and ITS spacers, only two mutations for ETS. Comparison of the sequences of these three markers with GenBank records confirmed the identity of Brazilian accessions as Salicornia neei. Maximum-likelihood phylogenetic analysis of ETS sequences indicated that the southern Brazilian accessions of Salicornia certainly are not close to any of the Salicornia ambigua accessions in GenBank, which are restricted to the northern hemisphere, nor are they related to any Salicornia fruticosa/Salicornia perennis clade accessions, which are also restricted to Eurasia. All above cited species have been wrongly applied to the southern Brazil sea asparagus. Key words: DNA sequences, Salicornioideae, Sarcocornia, halophyte, salt marshes. Resumo Análises filogenéticas moleculares baseadas em sequências das regiões espaçadoras ETS, ITS and atpB- rbcL avaliaram o status filogenético da espécie de aspargo marinho do gênero Salicornia (Salicornioideae, Amaranthaceae) presente no sul do Brasil. Os acessos do estuário da Lagoa dos Patos (32° S) foram obtidos de uma população selvagem e de duas linhagens puras de aspargo marinho, selecionadas de ecomorfotipos contrastantes com forma de crescimento prostrada (BTH1) e decumbente (BTH2) encontrados localmente. Plantas selvagens do estuário da Lagoa dos Patos e as progênies f4 de BTH1 e BTH2 mostraram sequencias 100% idênticas para a região espaçadora atpB-rbcL e ITS, apenas duas mutações em ETS. A comparação das sequências desses três marcadores com registros do GenBank confirmou a identidade dos acessos como Salicornia neei. Análise filogenética pelo método de máxima verossimilhança das sequências ETS indicou que os acessos de Salicornia do sul do Brasil certamente não são semelhantes a nenhum acesso de Salicornia ambigua no GenBank, os quais possuem distribuição restrita ao hemisfério norte, e nem são relacionados com qualquer acesso do clado Salicornia fruticosa/Salicornia perennis, este último restrito a Eurásia. Todas as espécies citadas acima têm sido erroneamente consideradas como sinonímias para o aspargo marinho do sul do Brasil. Palavras-chave: sequências de DNA, Salicornioideae, Sarcocornia, halófitas, marismas. Introduction halophytes” based on their ability to thrive in The small succulent shrubs with leafless seawater-flooded and hypersaline soils (Davy et stems and branches of the genera Salicornia al. 2006; Steffen et al. 2015). These halophytes L. and Sarcocornia A.J.Scott (Salicornioideae, have been consumed by humans for centuries, Amaranthaceae) are characterized as ‟extreme and to date are cultivated with a broad range of 1 Universidade Federal do Rio Grande-FURG, Inst. Oceanografia, Av. Itália km 8 s/n, 96203-900, Rio Grande, RS, Brazil. 2 Institute of Molecular Physiology, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany. 3 Universidade Federal de Pelotas, Depto. Botânica, Campus Universitário s/n, C.P. 354, 96010-900, Capão do Leão, RS, Brazil. 4 Author for correspondence: [email protected] 2 de 10 Costa CSB, Kadereit G & Freitas GPM saline water sources and sold as ‘sea asparagus’ or characters and molecular analyses. Previously, ‘samphire’, particularly used as functional gourmet Scott (1977) recognized only two species of food, animal feed meal and oils for biodiesel perennial Salicornia in South America (S. fruticosa (Ventura & Sagi 2013; Ventura et al. 2015; Costa and S. pulvinata). Similar annual Salicornia plants, & Herrera 2016). these two species have leafless succulent stems but The paucity of characters due to the strongly distinctly unequal sized flowers in their cymes with reduced morphology of Salicornia and Sarcocornia, a triangular arrangement. the great phenotypic plasticity (Kadereit et al. Salicornia ambigua is the only species 2006; Alonso & Crespo 2008; Doncato & Costa of sea asparagus listed for Brazil (Alonso & 2018) and high intrapopulation genetic diversity Crespo 2008). It was regarded as a synonym for in addition to the formation of hybrids between Salicornia gaudichaudiana Moq., Sarcocornia sympatric species through polyploidy (Davy et ambigua (Michx.) M.A.Alonso & M.B.Crespo, al. 2006; Steffen et al. 2015) generate a notorious the Mediterranean species Sarcocornia fruticosa difficult taxonomy making it almost impossible for (L.) A.J.Scott (Scott 1977), Salicornia fruticosa non-specialists to determine most species of these L. (BFG 2018) and Salicornia perennis Mill. genera. Molecular makers have been used to clarify (=Sarcocornia perennis (Miller) A.J.Scott) (Costa the phylogeny and biogeography of the subfamily et al. 2006; Isacch et al. 2006; Davy et al. 2006) Salicornioideae (Kadereit et al. 2006; Steffen et or the North American Salicornia virginica L. al. 2015; Piirainen et al. 2017). In a molecular (Reitz 1961). Additionally, many plants referred phylogeny based on Internal Transcribed Spacer to Salicornia ambigua Michx. and Salicornia (ITS) and atpB-rbcL spacer (chloroplast DNA) fruticosa (=Sarcocornia fruticosa) on the coasts of sequences of Sarcocornia formed a monophyletic Uruguay and NE Argentina are indistinguishable lineage together with the genus Salicornia, which from southern Brazilian sea asparagus (Costa & is clearly separated from the genus Arthrocnemum Davy 1992; Davy et al. 2006; Isacch et al. 2006). (R.Br.) Moq. (Kadereit et al. 2006). External Steffen et al. (2015) using molecular phylogenetic Transcribed Spacer (ETS) and matK-trnK intron analyses based on ETS, atpB-rbcL and rpl32- (chloroplast DNA) sequence data showed that trnL characterized S. fruticosa and S. perennis Salicornia is clearly nested in Sarcocornia and as exclusively Eurasian and partially supported sister to a clade comprising American and Eurasian Alonso & Crespo (2008) classification of South Sarcocornia (Kadereit et al. 2007; Piirainen American Salicornia, but no accessions from the et al. 2017). In the latest worldwide molecular Brazilian coast was assessed. phylogenetic treatment of Salicornioideae, Although both morphological (Scott 1977; Piirainen et al. (2017) showed that Sarcocornia is Alonso & Crespo 2008) and molecular studies paraphyletic in relation to Salicornia and proposed (Steffen et al. 2015; Piirainen et al. 2017) a new taxonomic classification, merging of recognized the occurrence of Salicornia ambigua Sarcocornia in three subgenera under Salicornia in Americas, they worked with specimens from affecting 19 new nomenclatural combinations and distinct locations and poorly sampled the Brazilian one replacement name. In the present study, we coast. Alonso & Crespo (2008) recognized followed the nomenclature proposed in Piirainen Brazilian plants as S. ambigua based on an over 45 et al. (2017). years-old herbarium specimen with slender woody In the most recent taxonomic classification stems at the base, and long and narrow terminal of the genus Salicornia in South America based inflorescence that produced small seeds with short on morphological features, Alonso & Crespo appressed hairs mostly on the edge. Their sampling (2008) accepted five perennial species of sea of S. ambigua pointed out the southernmost records asparagus (originally cited as Sarcocornia) and to Mar del Plata in the Argentinian province of cited the synonyms and types for the accepted Buenos Aires (39° S), and they also examined taxa: Salicornia ambigua Michx., S. andina specimens of this taxon collected in the Caribbean Phil., S. magellanica Phil., S. neei Lag. and S. region of Dominican Republic (19° N). The original pulvinata R.E.Fr. Alonso et al. (2017) described description of “Salicornia ambigua” was from a sixth perennial species named Salicornia plants from North American “Carolinas” (Michaux, cuscoensis Gutte & G.K. Müll. found in high 1803 sec. Alonso & Crespo 2008) and Steffen et Andean saltmarshes in Peru, the identity of which al. (2015) highlighted that in Florida S. ambigua is supported by differences in morphological occurs in extensive tidal flats. The S. ambigua Rodriguésia 70: e03122017. 2019 Salicornia neei in Brazil 3 de 10 accessions analyzed in Steffen et al. (2015) were of Laboratório de Biotecnologia de Halófitas collected from the Caribbean region and the east (Instituto de Oceanografia, FURG, Rio Grande, RS, Atlantic coast of U.S.A, and plants from Atlantic Brazil). These two lineages represent contrasting coast of Argentina turned out to belong to the S. prostrate and decumbent plants with reddish neei-S. pacifica-S. magellanica lineage. Alonso and green colorations, respectively, obtained by & Crespo (2008) also sampled and listed S. neei a 5 year breeding program based on pure line and S. magellanica for the Atlantic coast of South selection from ecomorphotypes found in local
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