Mating System Analysis and Genetic Diversity of Parkia multijuga Benth. One Native Tree Species of the Amazon

Abstract

The Amazonian native tree species Parkia multijuga has potential silvicultural characteristics that can be utilized to productive plantations. Understanding its mating system is necessary to delineate the methods for the breeding of the species, the collection of seeds for conservation, and the use of seedlings for production plantations. The aim of this study is to evaluate the mating system and population genetic diversity of P. multijuga, using molecular markers. The DNA of 221 plants was extracted and genotyped with nine microsatellite loci using capillary electrophoresis in an automated DNA sequencer. The estimates for single and multilocus crossing rates were 0.998 and 1.0, respectively. The paternity correlation was low (r^p(m) = 0.307). The fixation index (f) showed values below zero, indicating an excess of heterozygotes. The cluster number K = 2 shows a better grouping among families for genetic structure. P. multijuga families consist mainly of half-sibs, and the reproductive strategy of the species is allogamy.

Genetic and cytogenetic analysis of Moringa oleifera short and long capsule phenotypes

“…Likewise, in this work the genetic diversity (variability of an inbred population) of both genotypes was observed, in general in previous works have categorized Moringa oleifera as a species of high genetic diversity (Lakshmidevamma et al, 2021), in particular in this work a higher genetic diversity was presented in the short capsule population compared to that of the long capsule population with values of 0.33 and 0.31 respectively, similar behaviors in studies of cross-pollinated plants (Tomas et al, 2017). On the other hand, the genetic variation of the population (which represents the average number of alleles) was 1.88, a value attributed to cross-pollinated plants which can improve genetic diversity, and provide an advantage by reducing the risk of inbreeding depression (Oliveira et al, 2024). Likewise, an average number of alleles close to 1.55 is attributed to free pollination by factors in the environment such as air, and animals such as birds and insects, which could be a form of pollination due to moringa ower morphology and general tree morphology (Lakshmidevamma et al, 2021;Singh et al, 2020).…”