Abstract
The reproductive system determines evolutionary inheritance of populations by establishing patterns of gametes union to originate the next generation. The objective of this study was to investigate the mating system of Mimosa scabrella Benth. (bracatinga), a Brazilian tree species with socioeconomic and ecological importance, in a population of the mountainous region of Santa Catarina state, in two consecutive reproductive events. The analyzes in the 2015 and 2016 reproductive events were lead with isoenzymatic markers and the mating system characterization was performed based on mixed crosses and correlated crosses models, and the means of each parameter were statistically compared. Among the results, the multilocus outcrossing rates (tm(2015): 0.925 and tm(2016): 0.845) showed high magnitude and differed from the unit; the self-fertilization rates were significantly different from zero (s (2015): (0.075 and(2016): 0.155) indicating that the species does not show self-incompatibility. In addition, the positive outcrossing rates among relatives (tm-ts(2015): 0.142 and tm-ts(2016): 0.170) suggest inbreeding crosses in the population. The highest proportions in offspring were half-sibs (2015: 0.736 and 2016: 0.579), suggesting predominance of randomness at crossings. From this it is concluded that M. scabrella has a mixed mating system, with predominance of crossing at population level.
Highlights
In tree species, the study of the reproductive system is a primary step to find out estimates of crossbreeding in a population and to determine the mode of transmission of genes to descendants (MORI et al, 2013)
Reproduction can occur through crossings, self-fertilization and combinations of these, in addition to apomixis, modalities that can be elucidated with the help of genetic markers (GUSSON et al, 2006)
The objective of the study was to investigate the reproductive system of M. scabrella during two consecutive reproductive events in an existing population in the municipality of Lages, at mountainous region of Santa Catarina state
Summary
The study of the reproductive system is a primary step to find out estimates of crossbreeding in a population and to determine the mode of transmission of genes to descendants (MORI et al, 2013). For species of socioeconomic and ecological interest, knowing the reproductive system helps with information for conservation programs, genetic improvement and quantification of the number of trees for the collection of seeds. F. et al ISSN eletrônico 1982-4688 in recovering plantations (MORI et al, 2013). Reproduction can occur through crossings (random and biparental), self-fertilization and combinations of these, in addition to apomixis, modalities that can be elucidated with the help of genetic markers (GUSSON et al, 2006)
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