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Genetic Structure in Populations of Euterpe Precatoria Mart. in the Brazilian Amazon

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Genetic Structure in Populations of Euterpe Precatoria Mart. in the Brazilian Amazon fevo-08-603448 December 29, 2020 Time: 17:11 # 1 ORIGINAL RESEARCH published: 11 January 2021 doi: 10.3389/fevo.2020.603448 Genetic Structure in Populations of Euterpe precatoria Mart. in the Brazilian Amazon Santiago Linorio Ferreyra Ramos1, Gabriel Dequigiovanni2, Maria Teresa Gomes Lopes3*, Ananda Virginia de Aguiar4, Ricardo Lopes5, Elizabeth Ann Veasey6, Jeferson Luis Vasconcelos de Macêdo5, Alessandro Alves-Pereira7, Therezinha de Jesus Pinto Fraxe1, Marcos Silveira Wrege4 and José Nivaldo Garcia8 1 Universidade Federal do Amazonas, Manaus, Brazil, 2 Centro Universitário UNIVEL, Avenida Tito Muffato, Cascavel, Brazil, 3 Faculdade de Ciências Agrícolas, Universidade Federal do Amazonas, Manaus, Brazil, 4 Embrapa Florestas, Colombo, Brazil, 5 Embrapa Amazônia Ocidental, Manaus, Brazil, 6 Luiz de Queiroz College of Agriculture, University of São Paulo, Piracicaba, Brazil, 7 Departamento de Biologia Vegetal, Instituto de Biologia, Universidade Estadual de Campinas (UNICAMP), Campinas, Brazil, 8 Escola Superior de Agricultura Luiz de Queiroz/Universidade de São Paulo (ESALQ/USP), Departamento de Ciências Florestais, Piracicaba, Brazil Euterpe precatoria is a palm tree belonging to the Arecaceae family, occurring in Western and Central Brazilian Amazonia. Its fruit, which is very appreciated in the Amazon region, produces pulp that is consumed in fresh form. Its production is carried out almost exclusively by extractive farmers. In order to establish adequate strategies to Edited by: sustain this genetic resource, we need knowledge about the diversity and genetic Lawrence Hurd, structure in natural populations. This study aimed to evaluate the influence of geographic Washington and Lee University, United States distance on genetic structure in the main extractive populations of E. precatoria in the Reviewed by: Brazilian Amazon. Leaves from 377 plants were collected in 19 populations located in Christina Vinson, 16 municipalities in the State of Amazonas and three in the State of Rondônia. Twelve University of Brasilia, Brazil Evandro Vagner Tambarussi, microsatellite loci were used to genotype the plants. The diversity and genetic structure State University of Midwest Paraná, among populations were estimated. The average number of alleles per locus was Brazil 5.97. The observed heterozygosity means (HO) were higher than expected (HE) at the *Correspondence: population level (H = 0.72, H = 0.66) and fixation index (f = -0.100) was negative. The Maria Teresa Gomes Lopes O E [email protected] FST value (0.1820) and the AMOVA results (8 = 0.1796) showed population structure. The populations were clustered into three groups (K = 3) in the Bayesian analysis. The Specialty section: Discriminant Analysis of Principal Components (DAPC) confirmed eight clusters, with This article was submitted to Biogeography and Macroecology, the populations close to those identified by the Bayesian analysis. The geographic a section of the journal differentiation was confirmed by the groupings obtained in the Structure analysis Frontiers in Ecology and Evolution and the DACP function. Information related to phenotypic, genetic and environmental Received: 06 September 2020 Accepted: 10 December 2020 characterization of populations is important to guide conservation and management Published: 11 January 2021 strategies and the formulation of public species management policies in Amazonia. Citation: Keywords: Amazon, Arecaceae, microsatellites, açaí-do-Amazonas, genetic diversity, genetic structure Ramos SLF, Dequigiovanni G, Lopes MTG, Aguiar AV, Lopes R, Veasey EA, Macêdo JLV, INTRODUCTION Alves-Pereira A, Fraxe TJP, Wrege MS and Garcia JN (2021) Genetic Structure in Populations of Euterpe Palm trees compose a group of plants of particular economic importance, especially in rural precatoria Mart. in the Brazilian communities in tropical forests. More specifically, extractives provide building materials, fabrics, Amazon. Front. Ecol. Evol. 8:603448. fuels, food, ornamental plants and medicines (Sosnowska and Balslev, 2009). These present greater doi: 10.3389/fevo.2020.603448 abundance in regions closer to the Equator (Eiserhardt et al., 2011), but they are also found in Frontiers in Ecology and Evolution| www.frontiersin.org 1 January 2021| Volume 8| Article 603448 fevo-08-603448 December 29, 2020 Time: 17:11 # 2 Ramos et al. Genetic Structure Euterpe precatoria Amazon other tropical and subtropical regions, with spatial patterns Such programs will also result in genotypes with more diverse according to geographic variation. The Arecaceae family has characteristics for farmers, such as higher fruit production per more than 2,400 species grouped within the subfamilies plant, less harvesting of individuals, and early production. No Arecoideae, Calamoideae, Ceroxyloideae, Coryphoideae, and such ex situ conservation and genetic improvement programs Nypoideae (Dransfield et al., 2005; Govaerts and Dransfield, are currently in practice in Brazil for E. precatoria. The current 2005). In the Brazilian Amazon, the subfamily Arecoideae, conservation strategy adopted is in situ, and it occurs empirically tribe Euterpeae (Dransfield et al., 2005), has two palm trees in an agroforestry production system (Noda, 2012), or within of significant economic and social importance, Euterpe oleracea secondary forests. Mart. and Euterpe precatoria Mart (Kahn, 1991). The fruit of E. precatoria is known locally as açaí-do-Amazonas, açaí- these species are exploited mainly by extractive agriculture. The solitary, or açaí-de-terra-firma (Bovi and Castro, 1993) by production by extractivist farmers, of these two species, has its unique characteristics (FAO – Food and Agriculture allowed the Amazon region to be the largest producer of açaí in Organization of the United Nations, 1987; Kang et al., 2012). the national and international markets. Its occurrence is limited to the western and central Brazilian The açaí fruit is obtained from E. oleracea in Pará, Maranhão Amazon, but the species also occurs in the Amazonian borders and Amapá states, while in the states of Amazonas, Acre and of Peru, Brazil, Colombia (Kahn, 1991), and Bolivia (FAO – Rondônia it is extracted from E. precatoria. Between the years Food and Agriculture Organization of the United Nations, 1987; 1986 and 2010, the production of commercialized açaí fruit Bussmann and Zambrana, 2012). In addition to its use in the averaged 117,063.59 tons per year. This average production production of açaí, which has antioxidant and anti-inflammatory increased by 80.3% (211,100.63 tons) from 2011 to 2018. The properties superior to those of E. oleracea (Kang et al., 2012), the state of Pará remains the largest producer of açaí fruit (58.4%), species is also used in the construction of houses. Its roots are followed by the states of Amazonas (31.0%) and Maranhão the source of medicinal preparations to treat malaria, hepatitis (7.1%) (Instituto Brasileiro de Geografia e Estatística – IBGE, and other diseases (Bussmann and Zambrana, 2012). Another 2019). In the state of Amazonas, the fruit production increased important characteristic is its evolutionary adaptation. Plants of more than 6,317.7%, from an average production of 1,013.17– this species grow in the forest (sub-canopy) in environments with 65,021.8 tons per year in the last 8 years, by extractive both favorable and unfavorable soils, frequently forming small exploitation from E. precatoria. This highly significant increase groups of plants, between 10 and 20 individuals (FAO – Food in production in recent years could be affecting the genetic and Agriculture Organization of the United Nations, 1987), or variability of these species, leading to important impacts on among 50–250 plants/ha (Kahn, 1988). It also occurs in lower the structure and genetic composition of populations due to densities, around 2–3 trees.ha−1 (FAO – Food and Agriculture anthropic interference. This calls for the development of public Organization of the United Nations, 1987), in places with rainfall policies that can contribute to more sustainable management and in the range of 1,900–4,000 mm per year and average annual development models for palm species to meet current demands temperatures of 26◦C(FAO – Food and Agriculture Organization without compromising the ability to serve future generations of the United Nations, 1987). A study carried out on samples (García-Fernández et al., 2008). distributed throughout the Amazon, shows that E. precatoria We asked if current extraction of E. precatoria fruits is a common species and with Hyperdominant Patterns, in would create a problem in the future for obtaining successful the Amazon Forest Types, with a maximum abundance of regenerants to replace the current parents. The sustainability of 168/ha and an average presence of 32.7% in all sampled areas a fruit production system, for example E. precatoria, depends not (Steege et al., 2013). It is also of secondary successional class only on the intensity of the fruit harvest, but also on other aspects (Condé and Tonini, 2013). of the process, such as the period of abundance and distribution Euterpe precatoria is a highly promising species; therefore, of the resource, the strategy of growth and regeneration of the efforts are needed to establish strategies for domestication, species, as well as other management practices associated with the conservation, and management of its natural populations with harvest (Vallejo et al., 2014). Lack of natural regeneration of E. the support of riverside communities and farmers
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