Genetic and population diversity of bacuri (Platonia insignis Mart.) in Chapada Limpa extractive reserve, Maranho State, Brazil

Abstract

Landscape studies illustrate how the structure and configuration of ecological/agroecological zones influence the genetic diversity of a species. Thus, the aim of the present study is to assess how landscape structure and conservation influence the genetic diversity indices of Platonia insignis Mart. (bacuri) in Chapada Limpa Extractive Reserve, Chapadinha County, Maranhão State, Brazil. The study was carried out in an extractive reserve, whose surroundings are mapped for land use and occupation, as well as for the collection of bacuri biological materials used in genetic analysis with ISSR markers. The study shows there is prevalence of good preservation state and secondary vegetation, as well as a well-preserved Cerrado area, lato sensu. Genetic differences were higher within populations (85.2%) than between populations (14.7%). According to the genetic diversity index, there was high genetic diversity and heterozygous allele richness. This may ensure population viability. Based on the present results, it is possible to say that the genetic differentiation of bacuri may have suffered direct consequences from the intensive wildfire events and/or from primary vegetation reduction.

Biometric and Chemical Characterization of Fruits From Selections of Platonia insignis Mart., Native of the State of Maranhão, Brazil

“…It is also considered that part of this variation is attributed to the selections, being, therefore, of genetic character. Santos et al (2017), studying P. insignis from an extractive reserve located in the state of Maranhão, verified high genetic diversity within the studied populations (two groups composed of 15 individuals).…”

“…The fruits of native P. insignis species do not have uniformity in vegetative and reproductive aspects, thus they must be studied in order to establish selection criteria (Borges et al, 2010). Santos et al (2017) studying native P. insignis in the state of Maranhão observed significant genetic differences between populations. Souza et al (2001) in a characterization study of native P. insignis fruits reported 13.79%, 14.36 and 12.49 of pulp yield, soluble solids and acidity/sugars ratio, respectively, for fruits from the state of Maranhão.…”

Low Diversity and High Genetic Structure for Platonia insignis Mart., an Endangered Fruit Tree Species

“…Few studies on population genetics have been carried out so far regarding the bacurizeiro tree [1,[20][21][22], with most of them using ISSR (Inter Simple Sequence Repeat) markers. Paraense et al [23] developed 22 microsatellite markers (nSSRs) for bacurizeiro.…”