Genetic diversity of Schizolobium parahyba var. amazonicum (Huber ex. Ducke) Barneby, in a forest area in Brazil

Abstract

Schizolobium parahyba var. amazonicum (Fabaceae) is an arboreal species, endemic to the Amazon Rainforest, popularly known as paricá. It is used on a commercial scale in the timber sector, pulp and paper production, reclamation projects in degraded and landscaped areas. However, there is no availability of genetically improved material selected for the environmental conditions of the State of Espírito Santo, Brazil. In this sense, the present study aimed to characterize the genetic diversity in a population of S. amazonicum, established in a forest area in the southern region of the State of Espírito Santo, using inter-simple sequence repeat (ISSR) molecular markers. DNA samples from 171 individuals were analyzed using 11 ISSR primers, which generated 79 polymorphic bands in a total of 136 fragments (58%). The polymorphic information content performed for the ISSR markers revealed a mean of 0.37, classifying them as moderately informative. The number of loci found (N = 79) was greater than that established as the optimal number (N = 69) for the analyses. High genetic diversity was found with the parameters, genetic diversity of Nei (H = 0.375) and Shannon index (I = 0.554). The data demonstrated in the dendrogram, based on the UPGMA cluster analysis, corroborated by the Bayesian analysis performed by the STRUCTURE program, which indicated the formation of two distinct clusters (K = 2). One of the groups was formed with the majority of the individuals (153 genotypes) and the second with the minority (18 genotypes). The results revealed high genetic diversity in the population of S. amazonicum evaluated in the present study, determining the potential of the population to be used as an orchard for seed collection and production of seedlings with confirmed genetic variability.

Genetic diversity and phenotypic characterization of <i>Ochroma pyramidale</i> in plantations in Mato Grosso, Brazil

“…Giustina et al (2017) As little is known about the genetic variability of balsa wood, it is necessary to make comparisons with other similar species. Giustina et al (2017) identified dissimilarity values between 0 and 0.26 in commercial teak plantations, and Silva Júnior et al (2017) found dissimilarity values between 0.04 and 0.8 in Brazilian firetree forests.…”

Genetic characterization of Zeyheria tuberculosa progenies and evaluation for formation of a seed orchard

“…Inter Simple Sequence Repeats (ISSR) markers are commonly employed in genetic studies of forest populations to assess genetic diversity (Brandão, Vieira, Nazareno, & Carvalho, 2015;Silva Júnior, Souza, Pereira, Caldeira, & Miranda, 2017;Teixeira et al, 2020). They serve as a foundation for studies and programs aimed at producing seeds and clones of superior genetic quality.…”

Análise genética e fenotípica em progênies de polinização livre de Mimosa caesalpiniifolia Benth.: implicações para melhoramento genético

“…Quando a população é pequena e a variação genética intrapopulacional é estreita, aumenta-se a possibilidade de cruzamentos consanguíneos, resultando na manifestação de depressão por endogamia e isso prejudica a capacidade da descendência da população em se adaptar às mudanças bióticas e abióticas (Ingvarsson & Dahlberg, 2018). Assim é desejável que tanto as áreas de coleta de sementes quanto às coleções de germoplasma usadas para melhoramento genético possuam alta diversidade genética (Pritchard et al, 2014;Silva-Júnior, Souza, Pereira & Miranda, 2017).…”