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Taxonomic revision, phylogeny and biogeography of Martinella Baill. (Bignonieae, Bignoniaceae)

Grant number: 16/04143-9
Support type:Scholarships in Brazil - Master
Effective date (Start): August 01, 2016
Effective date (End): March 31, 2018
Field of knowledge:Biological Sciences - Botany
Principal Investigator:Lúcia Garcez Lohmann
Grantee:Eric Yasuo Kataoka
Home Institution: Instituto de Biociências (IB). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:12/50260-6 - Structure and evolution of the Amazonian biota and its environment: an integrative approach, AP.BTA.TEM

Abstract

The Neotropical region stands out for holding the richest biodiversity on Earth. Studies focusing on this region promise to answer long-standing evolutionary and biogeographic questions. Several hypotheses have been proposed to explain the high biodiversity found in the Neotropics, but several uncertainties remain about the factors responsible for the generation and maintenance of biodiversity in this region. Nevertheless, it is already a consensus that the diversification of the Neotropical biota was likely caused by a complex combination of interrelated factors. Tribe Bignonieae consists of 21 genera and 393 species endemic to the Neotropics, representing an excellent model for evolutionary and biogeographic studies in the Neotropics. Martinella Baill. is a monophyletic genus, well supported by morphological and molecular characters. The genus includes three species (Martinella insignis A.H. Gentry ex Zuntini & L.G. Lohmann, M. iquitoensis A. Samp. and M. obovata (Kunth) Bureau & K. Schum.), and is mainly characterized by the presence of a continuous interpetiolar ridge surrounding the stem and bilobed or 3-4-parted calices. Martinella insignis occurs in the Atlantic Forest, while the other two species are widely distributed in the Amazon region and Central America. Martinella iquitoensis and M. obovata present overlapping morphological characters, complicating the delimitation of these taxa. This project aims to: (i) Reconstruct the phylogeny of Martinella based on molecular markers (ndhF, rpl32-trnL and PepC) and data from "Next Generation Sequencing"; (ii) Conduct a taxonomic revision of Martinella based on morphological data and information from the molecular phylogeny; and, (iii) Reconstruct the biogeographic history of the group. This study is part of a broader project coordinated by Prof. Dr. Lucia G. Lohmann that aims to understand the assembly and evolution of the Amazonian biota and its environment.