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Towards a natural classification of Sapotaceae subfamily Chrysophylloideae in the Neotropics

Artikel i vetenskaplig tidskrift
Författare Aparecida Donisete De Faria
José Rubens Pirani
José Eduardo Lahoz Da Silva Ribeiro
Stephan Nylinder
Mário Henrique Terra-Araujo
Pedro Paulo Vieira
Ulf Swenson
Publicerad i Botanical journal of the Linnean Society
Volym 185
Sidor 27-55
ISSN 0024-4074
Publiceringsår 2017
Publicerad vid
Sidor 27-55
Språk en
Ämneskategorier Biologisk systematik, Botanik, Utvecklingsbiologi, Evolutionsbiologi

Sammanfattning

Generic limits of Chrysophyllum and Pouteria (Chrysophylloideae, Sapotaceae) have been found to be untenable. We here search for natural lineages in Neotropical Chrysophylloideae by sampling 101 terminals for molecular sequences of nuclear ribosomal DNA (external and internal transcribed spacer), the nuclear gene RPB2 and 17 morphological characters. Data were analysed with Bayesian inference and parsimony jackknifing. Morphological traits were finally optimized onto the tree to identify the most coherent characters. The resulting phylogenetic tree suggests that the limits of the well-known genera Chrysophyllum and Pouteria must be amended. Diploon, Ecclinusa and Elaeoluma can be maintained and Chrysophyllum sections Ragala section Prieurella and the satellite genera Achrouteria, Cornuella, Martiusella and Nemaluma merit generic resurrection. Lucuma may be restored if the type species belongs to the clade. The accepted genera Chromolucuma, Pradosia and Sarcaulus gain strong clade support, but are embedded in a core clade of Pouteria and may be relegated to the subgeneric level if morphological studies cannot provide evidence concurring with narrow generic concepts. Circumscriptions of Micropholis and Chrysophyllum sections Chrysophyllum and Villocuspis remain unclear and must be explored by using an extended taxon sampling. We predict that yet-to-be-analysed species of Pouteria sections Franchetella, Gayella, Oxythece and Pouteria and members of the currently accepted genera Chromolucuma, Pradosia and Sarcaulus will fall inside the core clade of Pouteria when analysed.

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