CiteULike

Delicious

Connotea

Citation for Study 10330

Citation title: "A gift from the New World? The West African crop Cucumeropsis mannii and the American Posadaea sphaerocarpa (Cucurbitaceae) are the same species".

Study name: "A gift from the New World? The West African crop Cucumeropsis mannii and the American Posadaea sphaerocarpa (Cucurbitaceae) are the same species".

This study is part of submission 10320 (Status: Published).

Citation

Schaefer H., & Renner S.S. 2010. A gift from the New World? The West African crop Cucumeropsis mannii and the American Posadaea sphaerocarpa (Cucurbitaceae) are the same species. Systematic Botany, .

Authors

• Schaefer H. (submitter) +44-(0)20-75942257
• Renner S.S. 011-49-(0)89-17861250

Abstract

The biogeographical history of several important vegetables is still unclear. In the gourd family, Cucurbitaceae, this applies to melon and cucumber, but also to many species of more regional importance. Cucumeropsis mannii is cultivated in West Tropical Africa for its nutritious seeds. Family-wide phylogenetic analyses suggested that it is closest to Posadaea sphaerocarpa from Central and South America, the seeds of which are also eaten and the fruit of which is made into bowls. To reconstruct these species? historical biogeography, we sequenced six plastid markers and the nuclear ribosomal ITS region for several accessions of both species, plus all relevant outgroups. Morphological traits were studied in 102 herbarium specimens representing both species. A 5,155 nucleotide-long matrix of chloroplast and nuclear DNA contained a single informative mutation in a poly-C region of nuclear ITS among six accessions that covered the species? native ranges. Next-closest species differed in all plastid markers and by >34 mutations in ITS1 and ITS2. Study of the morphology revealed a possible small difference in fruit shape (cylindrical-ovate versus spherical), presumably resulting from human selection on the African populations. The closest outgroups Melancium and Melothria are endemic to the neotropics, and maximum likelihood area reconstruction indicates that Cucumeropsis mannii also originated there. The near-absence of genetic and morphological differentiation implies that gene flow between Cucumeropsis manni and Posadaea sphaerocarpa stopped relatively recently, and taxonomically they should (or could) be treated as one species. Transport of seeds during the transatlantic slave trade is a possible scenario, although we cannot reject natural dispersal.

Keywords

Benincaseae, DNA barcoding, egusi, long distance dispersal, molecular phylogenetics, oil-rich seeds

External links

About this resource

• Canonical resource URI: http://purl.org/phylo/treebase/phylows/study/TB2:S10330
• Other versions: Nexus NeXML
• Show BibTeX reference

  		@ARTICLE{TreeBASE2Ref18819,
  	 author = {Hanno  Schaefer and Susanne S Renner},
  	 title = {A gift from the New World? The West African crop Cucumeropsis mannii and the American Posadaea sphaerocarpa (Cucurbitaceae) are the same species},
  	 year = {2010},
  	 keywords = {Benincaseae, DNA barcoding, egusi, long distance dispersal, molecular phylogenetics, oil-rich seeds},
  	 doi = {},
  	 url = {http://},
  	 pmid = {},
  	 journal = {Systematic Botany},
  	 volume = {},
  	 number = {},
  	 pages = {},
  	 abstract = {The biogeographical history of several important vegetables is still unclear. In the gourd family, Cucurbitaceae, this applies to melon and cucumber, but also to many species of more regional importance. Cucumeropsis mannii is cultivated in West Tropical Africa for its nutritious seeds. Family-wide phylogenetic analyses suggested that it is closest to Posadaea sphaerocarpa from Central and South America, the seeds of which are also eaten and the fruit of which is made into bowls. To reconstruct these species? historical biogeography, we sequenced six plastid markers and the nuclear ribosomal ITS region for several accessions of both species, plus all relevant outgroups. Morphological traits were studied in 102 herbarium specimens representing both species. A 5,155 nucleotide-long matrix of chloroplast and nuclear DNA contained a single informative mutation in a poly-C region of nuclear ITS among six accessions that covered the species? native ranges. Next-closest species differed in all plastid markers and by >34 mutations in ITS1 and ITS2. Study of the morphology revealed a possible small difference in fruit shape (cylindrical-ovate versus spherical), presumably resulting from human selection on the African populations. The closest outgroups Melancium and Melothria are endemic to the neotropics, and maximum likelihood area reconstruction indicates that Cucumeropsis mannii also originated there. The near-absence of genetic and morphological differentiation implies that gene flow between Cucumeropsis manni and Posadaea sphaerocarpa stopped relatively recently, and taxonomically they should (or could) be treated as one species. Transport of seeds during the transatlantic slave trade is a possible scenario, although we cannot reject natural dispersal.}
  }
  		

• Show RIS reference

  		TY  - JOUR
  ID  - 18819
  AU  - Schaefer,Hanno 
  AU  - Renner,Susanne S
  T1  - A gift from the New World? The West African crop Cucumeropsis mannii and the American Posadaea sphaerocarpa (Cucurbitaceae) are the same species
  PY  - 2010
  KW  - Benincaseae
  KW  - DNA barcoding
  KW  - egusi
  KW  - long distance dispersal
  KW  - molecular phylogenetics
  KW  - oil-rich seeds
  UR  - http://dx.doi.org/
  N2  - The biogeographical history of several important vegetables is still unclear. In the gourd family, Cucurbitaceae, this applies to melon and cucumber, but also to many species of more regional importance. Cucumeropsis mannii is cultivated in West Tropical Africa for its nutritious seeds. Family-wide phylogenetic analyses suggested that it is closest to Posadaea sphaerocarpa from Central and South America, the seeds of which are also eaten and the fruit of which is made into bowls. To reconstruct these species? historical biogeography, we sequenced six plastid markers and the nuclear ribosomal ITS region for several accessions of both species, plus all relevant outgroups. Morphological traits were studied in 102 herbarium specimens representing both species. A 5,155 nucleotide-long matrix of chloroplast and nuclear DNA contained a single informative mutation in a poly-C region of nuclear ITS among six accessions that covered the species? native ranges. Next-closest species differed in all plastid markers and by >34 mutations in ITS1 and ITS2. Study of the morphology revealed a possible small difference in fruit shape (cylindrical-ovate versus spherical), presumably resulting from human selection on the African populations. The closest outgroups Melancium and Melothria are endemic to the neotropics, and maximum likelihood area reconstruction indicates that Cucumeropsis mannii also originated there. The near-absence of genetic and morphological differentiation implies that gene flow between Cucumeropsis manni and Posadaea sphaerocarpa stopped relatively recently, and taxonomically they should (or could) be treated as one species. Transport of seeds during the transatlantic slave trade is a possible scenario, although we cannot reject natural dispersal.
  L3  - 
  JF  - Systematic Botany
  VL  - 
  IS  - 
  ER  -