Topic
Jacaratia
About: Jacaratia is a research topic. Over the lifetime, 11 publications have been published within this topic receiving 393 citations.
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TL;DR: The authors investigated the evolution of the Caricaceae based on sequences from all species and genera, the monospecific Carica, African Cylicomorpha with two species, South American Jacaratia and Vasconcellea with together c. 28 species, and Mexican/Guatemalan Jarilla and Horovitzia with four species.
106 citations
TL;DR: The specific clustering of the highly diverse group of Vasconcella × heilbornii accessions suggests that these genotypes may be the result of bi-directional introgression events between Vascon cella stipulata and Vascon Cella cundinamarcensis.
Abstract: The AFLP technique was used to assess the genetic relationships among the cultivated papaya (Carica papaya L) and related species native to Ecuador Genetic distances based on AFLP data were estimated for 95 accessions belonging to three genera including C papaya, at least eight Vasconcella species and two Jacaratia species Cluster analysis using different methods and principal co-ordinate analysis (PCO), based on the AFLP data from 496 polymorphic bands generated with five primer combinations, was performed The resulted grouping of accessions of each species corresponds largely with their taxonomic classifications and were found to be consistent with other studies based on RAPD, isozyme and cpDNA data The AFLP analysis supports the recent rehabilitation of the Vasconcella group as a genus; until recently Vasconcella was considered as a section within the genus Carica Both cluster and PCO analysis clearly separated the species of the three genera and illustrated the large genetic distance between C papaya accessions and the Vasconcella group The specific clustering of the highly diverse group of Vasconcella × heilbornii accessions also suggests that these genotypes may be the result of bi-directional introgression events between Vasconcella stipulata and Vasconcella cundinamarcensis
99 citations
TL;DR: The chloroplast and mitochondrial DNA diversity of 61 genotypes belonging to 18 Vasconcellea species was studied by PCR-RFLP analysis, and intraspecific cpDNA variation was detected in V. × heilbornii, providing molecular evidence for the high diversity previously indicated by morphological observations.
Abstract: The chloroplast and mitochondrial DNA diversity of 61 genotypes belonging to 18 Vasconcellea species, the so-called highland papayas, was studied by PCR-RFLP analysis of two non-coding cpDNA regions (trnM-rbcL and trnK1-trnK2) and one non-coding mtDNA region (nad4/1-nad4/2). This sample set was supplemented with six genotypes belonging to three other Caricaceae genera: the monotypic genus Carica, including only the cultivated papaya, and the genera Jacaratia and Cylicomorpha. Moringa ovalifolia was added as an outgroup species. The PCR-amplified cpDNA regions were digested with 18 restriction endonucleases, the mtDNA region with 11. A total of 22 point mutations and four insertion/deletions were scored in the sample. A higher level of interspecific variation was detected in the two cpDNA regions in comparison to the analysis of the mtDNA. Wagner parsimony and Neighbor-Joining analysis resulted in dendrograms with similar topologies. PCR-RFLP analysis supported the monophyly of Caricaceae, but among the 26 mutations scored, an insufficient number of markers discriminated between the different Caricaceae genera included in this study. Hence the inference of the intergeneric relationships within Caricaceae was impossible. However, some conclusions can be noted at a lower taxonomic level. The Caricaceae species were divided into two lineages. One group included only Vasconcellea spp., whereas the second included the remaining Vasconcellea spp., together with the papaya genotypes and those from the other Caricaceae genera. This may indicate a higher level of inter-fertility for the Vasconcellea species from the latter clade in interspecific crossings with papaya. The putative progenitors of the natural sterile hybrid V. × heilbornii, i.e. V. stipulata and V. cundinamarcensis, were only distantly related to V. × heilbornii. This indicates that probably none of these species was involved as the maternal progenitor in the origin of V. × heilbornii. Surprisingly, V. × heilbornii had organellar genome patterns identical with V. weberbaueri, suggesting a possible involvement of this species in the origin of V. × heilbornii. On the basis of discrepancy between morphological traits and the cpDNA profiles of some pairs of Vasconcellea species, we believe that besides V. × heilbornii, some other species have originated through interspecific hybridization. A reticulate evolution for Vasconcellea has therefore been suggested. Finally, intraspecific cpDNA variation was detected in V. microcarpa, thus providing molecular evidence for the high diversity previously indicated by morphological observations.
79 citations
TL;DR: The striking quantitative differences suggest the possible use of BITC content as a chemotaxonomic criterion in seeds of Jacaratia.
37 citations
TL;DR: In this paper, a phylogenetic analysis based on nucleotide sequences from the ITS of the ribosomal DNA and three chloroplast fragments (matK, trnL−trnF, and psbA-trnH) was performed to clarify phylogenetic relationships and evolution within Caricaceae.
36 citations