Abstract
The genus Spondias (family Anacardiaceae) comprises 19 taxa, ten of which occur in Neotropical regions. Spondias bahiensis has been suggested to be a hybrid, although initial evidence does not support this hypothesis. The aim of this study was to test the hypothesis of the hybrid origin of S. bahiensis using high-throughput sequencing with single nucleotide polymorphism (SNP) analysis, characterization of intragenomic nuclear ribosomal DNA (nrDNA), and nuclear and chloroplast phylogenomic analyses. The SNP analysis revealed a high number of SNPs in the S. bahiensis genome, and with respect to nrDNA, S. bahiensis shared approximately half of the SNP alleles with S. tuberosa, but not with S. mombin. Combining the SNP analysis with nrDNA phylogeny confirmed the hybrid origin of S. bahiensis and put S. tuberosa as the female genitor. Considering the phylogeny of the genus Spondias and intraspecific SNPs in S. bahiensis, the putative male genitor is S. dulcis.
Highlights
IntroductionThe genus Spondias (family Anacardiaceae) comprises 19 taxa, 10 of which occur in Neotropical regions (Mitchell and Daly, 2015)
The genus Spondias comprises 19 taxa, 10 of which occur in Neotropical regions (Mitchell and Daly, 2015)
Spondias bahiensis has been popularly known as a hybrid between S. tuberosa and S. mombin, but this hypothesis was contested by chromosome banding and genomic in situ hybridization (GISH) studies (Almeida et al, 2007), DNA barcoding (Silva et al, 2015), and molecular and morphological analyses (Machado et al, 2015)
Summary
The genus Spondias (family Anacardiaceae) comprises 19 taxa, 10 of which occur in Neotropical regions (Mitchell and Daly, 2015). S. mombin and S. bahiensis, which are known by the vernacular names umbu, cajá, taperebá, and umbu-cajá, occur in northeastern Brazil. Machado et al (2015) discussed the possibility that S. bahiensis could have originated by hybridization between S. tuberosa and S. venulosa, but there is no evidence in support of this hypothesis either. Spondias bahiensis has been popularly known as a hybrid between S. tuberosa and S. mombin, but this hypothesis was contested by chromosome banding and genomic in situ hybridization (GISH) studies (Almeida et al, 2007), DNA barcoding (Silva et al, 2015), and molecular and morphological analyses (Machado et al, 2015). In this context, a recent study used high-
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