Mating system analysis of Açaí-do-Amazonas (Euterpe precatoria Mart.) using molecular markers

Ramos, Santiago Linório Ferreyra; Lopes, Maria Teresa Gomes; Lopes, Ricardo; Dequigiovanni, Gabriel; Macêdo, J. L. V. de; Sebbenn, Alexandre Magno; Silva, Edson Barcelos da; Garcia, José Nivaldo

doi:10.1590/1984-70332019v19n1n17

Cited by 15 publications

(21 citation statements)

References 19 publications

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“…The negative values for the fixation indices (f ) and the observed (H O ) and expected (H E ) heterozygosity coefficients indicate high genetic diversity (Nazareno and Reis, 2014), as confirmed by the excess of heterozygotes in the populations. The low f values and high H O also indicate that the result may be influenced by the reproductive system of the species (Ramos et al, 2011) which is allogamy (Ramos et al, 2018(Ramos et al, , 2019. Similar results were found in other palm species, such as Geonoma schottiana (Silva et al, 2011), Phoenix dactylifera (Arabnezhad et al, 2012) and Oenocarpus bataua (Ottewell et al, 2012), which could indicate a behavior common to plants of the family Arecaceae.…”

Section: Discussionsupporting

confidence: 67%

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

Ramos

Dequigiovanni²,

Lopes

et al. 2021

Front. Ecol. Evol.

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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 sustain this genetic resource, we need knowledge about the diversity and genetic structure in natural populations. This study aimed to evaluate the influence of geographic distance on genetic structure in the main extractive populations of E. precatoria in the Brazilian Amazon. Leaves from 377 plants were collected in 19 populations located in 16 municipalities in the State of Amazonas and three in the State of Rondônia. Twelve microsatellite loci were used to genotype the plants. The diversity and genetic structure among populations were estimated. The average number of alleles per locus was 5.97. The observed heterozygosity means (HO) were higher than expected (HE) at the population level (HO = 0.72, HE = 0.66) and fixation index (f = -0.100) was negative. The FST value (0.1820) and the AMOVA results (Φ = 0.1796) showed population structure. The populations were clustered into three groups (K = 3) in the Bayesian analysis. The Discriminant Analysis of Principal Components (DAPC) confirmed eight clusters, with the populations close to those identified by the Bayesian analysis. The geographic differentiation was confirmed by the groupings obtained in the Structure analysis and the DACP function. Information related to phenotypic, genetic and environmental characterization of populations is important to guide conservation and management strategies and the formulation of public species management policies in Amazonia.

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Section: Discussionsupporting

confidence: 67%

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

Ramos

Dequigiovanni²,

Lopes

et al. 2021

Front. Ecol. Evol.

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“…The interspecific hybridization of the species E. oleracea and E. precatoria also needs to be investigated, to observe the agronomic performance and the harvest period of the hybrids, with the possibility of obtaining genotypes with an extension of the production period, depending on the genetic control of the character. On the other hand, as they are predominantly allogamous species (RAMOS et al, 2019;SANTOS et al, 2020), they can interbreed. Growing E. oleracea close to natural populations of E. precatoria, or vice versa poses the risk of contamination of native populations with the introduced species, with important consequences for the conservation of genetic resources, as there will be a change in the structure and genetic composition of native populations with natural hybridization between species.…”

Section: Resultsmentioning

confidence: 99%

Seasonality of fruit production of Euterpe oleracea and E. precatoria açaí palm trees cultivated in the metropolitan region of Manaus (AM)

Lopes

Cunha

Tavares

et al. 2022

AGRO@MBIENTE ON-LINE

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The off-season period for açaí palm production cause social and economic problems that affect producers and consumers. Two species are used for açaí pulp production, Euterpe oleracea and E. precatoria. These species have some distinct characteristics, including the harvest period. The cultivation of açaí palm is expanding in the metropolitan region of Manaus, state of Amazonas, AM, and there are no studies on the harvest period of these species under cultivated conditions in this region. The objective of this study was to evaluate the reproductive phenophases of the açaí palm E. oleracea and E. precatoria grown in the metropolitan region of Manaus, state of Amazonas and to check the harvest period of these species in this region. The reproductive phenophases were evaluated during 24 consecutive months in 20 plants of each species. E. oleracea emitted a greater number of inflorescences from January to July (76%), during the rainy season, and presented a greater number of mature bunches (56%) from October to December, at the end of the dry season. E. precatoria emitted the highest number of inflorescences (70%) from July to November, during the dry season, and the highest proportion of mature bunches (49%) was observed between May and July, at the end of the rainy season. The species presented different harvest periods, so the cultivation of both can contribute to reducing the off-season period of açaí fruit production in the metropolitan region of Manaus, AM.

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“…Similarily, another leguminosae forage, Stylosanthes was described as autogamous based on morphological marker analyses (Bray and Hutton 1976). However, studies using microsatellites reported more accurate estimates (Santos-Garcia et al 2011;Sousa et al 2012;Ramos et al 2019), as the analyses are based on many loci, detect high polymorphism in any growth stage, and can be applied in many progeny samples. Thus, our results support molecular genotyping as a more precise method to evaluate mating systems.…”

Section: Discussionmentioning

confidence: 99%

Inferring mating system parameters in forage peanut, Arachis pintoi, for Brazilian Amazon conditions

Oliveira

Rufino²,

Azêvedo

et al. 2019

Acta Amaz.

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The search for alternatives to increase productivity and sustainability of livestock production in the Amazon region without increasing deforestation is challenging. Mixed pastures of grasses with forage peanut (Arachis pintoi) have shown positive economic impacts. However, gaps in the knowledge of the reproductive biology of A. pintoi have limited the development of new cultivars adapted to the environmental variations in the Brazilian Amazon. Pasture consortiums of Brachiaria humidicola with forage peanuts (cv. Mandobi) resulted in a 42% increase in weight gain productivity. New cultivars better adapted to the Amazon climate should bring even greater gains. We evaluated the mating system in twenty A. pintoi accessions, and approximately 40 offspring per accession genotyped with eight microsatellites (or markers). The parameters of genetic diversity and inbreeding, the outcrossing rate and coancestry were calculated. The observed heterozygosity was significantly higher and the fixation index was significantly lower in adults compared with the offspring. The crossing rate was variable among genotypes (2 to 80%), and the mean outcrossing rate was 36%. These results indicate that pollinator presence in pastures can influence gene flow in A. pintoi more than expected. Arachis pintoi presented a mixed mating system with a predominance of selfing, and families presented inbreeding and different levels of relatedness. New strategies of genotype conservation are needed to avoid pollinator-mediated crossing between accessions.

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Mating system analysis of Açaí-do-Amazonas (Euterpe precatoria Mart.) using molecular markers

Cited by 15 publications

References 19 publications

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

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

Seasonality of fruit production of Euterpe oleracea and E. precatoria açaí palm trees cultivated in the metropolitan region of Manaus (AM)

Inferring mating system parameters in forage peanut, Arachis pintoi, for Brazilian Amazon conditions

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