Mating system and intrapopulational genetic diversity of Copernicia prunifera (Arecaceae): a native palm from Brazilian semiarid

The aim of this study was to investigate the mating system and genetic diversity of the palm Copernicia prunifera using inter-simple sequence repeat markers. We found that the C. prunifera has multiple inflorescences with hermaphroditic flowers and pollen viability of 62%. Outcrossing rates at the p...

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Bibliographic Details
Published in:Genetics and molecular research 2017-09, Vol.16 (3), p.1
Main Authors: Silva, R A R, Fajardo, C G, Vieira, F A
Format: Article
Language:English
Subjects:
Arecaceae - genetics
Arecaceae - physiology
Copernicia prunifera
Diversity indices
Flowers
Flowers - genetics
Flowers - physiology
Genetic diversity
Heterozygosity
Heterozygote
Inbreeding
Mating
Microsatellite Repeats
Mutation
Plant populations
Pollen - genetics
Pollen - physiology
Pollination
Polymorphism, Genetic
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Summary:The aim of this study was to investigate the mating system and genetic diversity of the palm Copernicia prunifera using inter-simple sequence repeat markers. We found that the C. prunifera has multiple inflorescences with hermaphroditic flowers and pollen viability of 62%. Outcrossing rates at the population level (N = 267) produced a multilocus outcrossing rate (t ) of 0.878 and a single-locus outcrossing rate (t ) of 0.738, indicating that C. prunifera has a mixed mating system that is preferentially allogamous. The rate of mating among relatives (t - t ) was low, indicating limited outcrossing between closely related individuals. The fixation index between seed trees (F) was negative (0.200), suggesting an absence of inbreeding, while the correlation of selfing (r ) was high (0.914). The values of the diversity indices among adults and progenies did not differ statistically (H = 0.319 and I = 0.470; H = 0.337 and I = 0.505, respectively). In testing for the presence of genetic bottlenecks using the infinite allele model and the stepwise mutation model, we observed a reduction in the effective population, as well as a deficit in heterozygosity (P < 0.0001). The results of this study inform management strategies for the conservation and genetic improvement of the C. prunifera palm.
ISSN:1676-5680
1676-5680
DOI:10.4238/gmr16039764