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  • 1.
    Kainulainen, Kent
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Botaniska institutionen.
    Mouly, Arnaud
    Khodabandeh, Anbar
    Stockholms universitet, Naturvetenskapliga fakulteten, Botaniska institutionen.
    Bremer, Birgitta
    Stockholms universitet, Naturvetenskapliga fakulteten, Botaniska institutionen.
    Molecular phylogenetic analysis of the tribe Alberteae (Rubiaceae), with description of a new genus, Razafimandimbisonia2009Ingår i: Taxon, ISSN 0040-0262, E-ISSN 1996-8175, Vol. 58, nr 3, s. 757-768Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The tribe Alberteae, presently classified in the subfamily Ixoroideae (Rubiaceae), has historically been an artificial grouping of genera. In the present study, phylogenetic analyses of the chloroplast DNA markers rbcL, ndhF, trnS-G, trnT-F and trnH-psbA as well as the ITS region of the nuclear ribosomal DNA, are done to assess the delimitation of Alberteae. The resulting phylogenetic hypothesis is highly resolved, with most clades strongly supported. The genus Alberta is found to be paraphyletic as presently circumscribed. As a consequence, we propose the new genus Razafimandimbisonia Kainul. & B. Bremer to accommodate the Malagasy species. The newly delimited Alberta is distinguished by having two calycophylls that expand after anthesis as well as awl-shaped stigma lobes. Razafimandimbisonia is distinguished from the remaining Alberteae by having dehiscent fruits and anthers without basal appendages. We demonstrate that the genera Airosperma, Boholia and Crossopteryx are not associated with Alberteae, as has previously been suggested. Alberteae is considered restricted to the genus Alberta endemic to Southeast Africa, and the two Malagasy endemic genera Nematostylis and Razafimandimbisonia.

  • 2. Mouly, Arnaud
    et al.
    Razafimandimbison, Sylvain
    Stockholms universitet, Naturvetenskapliga fakulteten, Bergianska botaniska trädgården (tills m Kungl. Vetenskapsakademien). Stockholms universitet, Naturvetenskapliga fakulteten, Botaniska institutionen.
    Khodabandeh, Anbar
    Stockholms universitet, Naturvetenskapliga fakulteten, Bergianska botaniska trädgården (tills m Kungl. Vetenskapsakademien). Stockholms universitet, Naturvetenskapliga fakulteten, Botaniska institutionen.
    Bremer, Birgitta
    Stockholms universitet, Naturvetenskapliga fakulteten, Bergianska botaniska trädgården (tills m Kungl. Vetenskapsakademien). Stockholms universitet, Naturvetenskapliga fakulteten, Botaniska institutionen.
    Phylogeny and classification of the species-rich pantropical showy genus Ixora (Rubiaceae-Ixoreae) with indications of geographical monophyletic units and hybrids2009Ingår i: American Journal of Botany, ISSN 0002-9122, E-ISSN 1537-2197, Vol. 96, s. 686-706Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Species-rich genera often have various conflicting circumscriptions from independent regional fl ora treatments. Testing the monophyly of these groups of plants is an important step toward the establishment of a phylogenetic classifi cation. The genus Ixora of the tribe Ixoreae in the subfamily Ixoroideae (coffee family or Rubiaceae) is a species-rich pantropical genus of ca. 500 species. Phylogenetic analyses of Ixoreae based on combined sequence data from one nuclear (nrETS) and two chloroplast ( rps16 and trnT-F ) markers reveal the paraphyly of Ixora as presently delimited and also show that the tribe can be subdivided into three major

    clades: the Mascarene/neotropical/Malagasy/African clade, the Pacifi c clade, and the Asian clade. Given the lack of morphological synapomorphies supporting the different Ixora clades and the morphological consistency of the ingroup taxa, we propose a broad circumscription of Ixora including all its satellite genera: Captaincookia , Doricera , Hitoa , Myonima , Sideroxyloides , Thouarsiora, and Versteegia . The current infrageneric classifi cation of Ixora is not supported. The different Ixora subclades represent geographical units. Nuclear and chloroplast tree topologies were partially incongruent, indicating at least four potential natural hybridization events. Other confl icting positions for the cultivated species are most likely due to anthropogenic hybridization.

  • 3.
    Razafimandimbison, Sylvain G.
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och botanik. Stockholms universitet, Naturvetenskapliga fakulteten, Bergianska botaniska trädgården (tills m Kungl. Vetenskapsakademien).
    Taylor, Charlotte M.
    Wikström, Niklas
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och botanik. Stockholms universitet, Naturvetenskapliga fakulteten, Bergianska botaniska trädgården (tills m Kungl. Vetenskapsakademien).
    Pailler, Thierry
    Khodabandeh, Anbar
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och botanik. Stockholms universitet, Naturvetenskapliga fakulteten, Bergianska botaniska trädgården (tills m Kungl. Vetenskapsakademien).
    Bremer, Birgitta
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och botanik. Stockholms universitet, Naturvetenskapliga fakulteten, Bergianska botaniska trädgården (tills m Kungl. Vetenskapsakademien).
    PHYLOGENY AND GENERIC LIMITS IN THE SISTER TRIBES PSYCHOTRIEAE AND PALICOUREEAE (RUBIACEAE): EVOLUTION OF SCHIZOCARPS IN PSYCHOTRIA AND ORIGINS OF BACTERIAL LEAF NODULES OF THE MALAGASY SPECIES2014Ingår i: American Journal of Botany, ISSN 0002-9122, E-ISSN 1537-2197, Vol. 101, nr 7, s. 1102-1126Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Premise of the study: The pantropical, species-rich Psychotrieae and Palicoureeae are sister tribes of mostly drupe-bearing and nonbacterial leaf-nodulating species with problematic generic limits. This problem is more complicated in Psychotrieae due to the paraphyly of the genus Psychotria, the lack of diagnostic characters for some major lineages, and the poor sampling from some biodiversity hotspots. Schizocarps and bacterial leaf nodules have been used for recognizing formal groups in Psychotrieae, but their evolution and taxonomic value have not been studied using a robust phylogeny of the tribe. Methods: We analyzed 287 samples from the entire ranges of the tribes, with particular emphasis on the Western Indian Ocean region, with the Bayesian Markov chain Monte Carlo method. Key results: All allied Psychotria genera investigated are nested within a paraphyletic Psychotria. Schizocarps evolved independently two times within Psychotria, and one reversal back to the drupaceous condition is inferred. The Malagasy leaf-nodulated Psychotrieae (except Apomuria bullata) and the Comorian non-leaf-nodulated Psychotria conocarpa are nested within the (African) leaf-nodulated clade. Within Palicoureeae, Chassalia is paraphyletic with respect to Geophila sensu stricto, and the Malagasy Geophila gerrardii and the African Hymenocoleus are closely related. Conclusions: A widely circumscribed Psychotria encompassing the entire Psychotrieae is supported. Within Psychotria, two separate origins of schizocarps from drupes, one reversal back to the drupaceous condition, and two independent origins of the Malagasy leafnodulated species are inferred. A new genus Puffia is described to accommodate Geophila gerrardii, and a narrow circumscription of Chassalia is adopted. Thirty-two new combinations, two lectotypifications, and 25 new names are presented.

  • 4.
    Rydin, Catarina
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Botaniska institutionen.
    Khodabandeh, Anbar
    Stockholms universitet, Naturvetenskapliga fakulteten, Botaniska institutionen. Stockholms universitet, Naturvetenskapliga fakulteten, Bergianska botaniska trädgården (tills m Kungl. Vetenskapsakademien).
    Endress, Peter K.
    The female reproductive unit of Ephedra (Gnetales): comparative morphology and evolutionary perspectives2010Ingår i: Botanical journal of the Linnean Society, ISSN 0024-4074, E-ISSN 1095-8339, Vol. 163, nr 4, s. 387-430Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Morphological variation in Ephedra (Gnetales) is limited and confusing from an evolutionary perspective, with parallelisms and intraspecific variation. However, recent analyses of molecular data provide a phylogenetic framework for investigations of morphological traits, albeit with few informative characters in the investigated gene regions. We document morphological, anatomical and histological variation patterns in the female reproductive unit and test the hypothesis that some Early Cretaceous fossils, which share synapomorphies with Ephedra, are members of the extant clade. Results indicate that some morphological features are evolutionarily informative although intraspecific variation is evident. Histology and anatomy of cone bracts and seed envelopes show clade-specific variation patterns. There is little evidence for an inclusion of the Cretaceous fossils in the extant clade. Rather, a hypothesized general pattern of reduction of the vasculature in the ephedran seed envelope, probably from four vascular bundles in the fossils, to ancestrally three in the living clade, and later to two, is consistent with phylogenetic and temporal analyses, which indicate that extant diversity evolved after the Cretaceous-Tertiary boundary. Notwithstanding striking similarities between living and Cretaceous Ephedra, available data indicate that the Mesozoic diversity went almost entirely extinct in the late Cretaceous causing a bottleneck effect in Ephedra, still reflected today by an extraordinarily low level of genetic and structural diversity.

  • 5.
    Rydin, Catarina
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Botaniska institutionen.
    Razafimandimbison, Sylvain
    Stockholms universitet, Naturvetenskapliga fakulteten, Botaniska institutionen. Stockholms universitet, Naturvetenskapliga fakulteten, Bergianska botaniska trädgården (tills m Kungl. Vetenskapsakademien).
    Khodabandeh, Anbar
    Stockholms universitet, Naturvetenskapliga fakulteten, Botaniska institutionen. Stockholms universitet, Naturvetenskapliga fakulteten, Bergianska botaniska trädgården (tills m Kungl. Vetenskapsakademien).
    Bremer, Birgitta
    Stockholms universitet, Naturvetenskapliga fakulteten, Botaniska institutionen. Stockholms universitet, Naturvetenskapliga fakulteten, Bergianska botaniska trädgården (tills m Kungl. Vetenskapsakademien).
    Evolutionary relationships in the Spermacoceae alliance (Rubiaceae) using information from six molecular loci: insights into systematic affinities of Neohymenopogon and Mouretia2009Ingår i: Taxon, ISSN 0040-0262, E-ISSN 1996-8175, Vol. 58, nr 3, s. 793-810Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Several recent phylogenetic studies of Rubiaceae have dealt with enigmatic taxa whose systematic positions have been previously unknown or controversial. We address evolutionary relationships in the Spermacoceae alliance (Rubioideae) with special emphasis on the Asian genera Mouretia and Neohymenopogon, here sequenced for the first time. Both genera belong in the tribe Argostemmateae and have persistent calyx lobeson the fruit in common with Argostemma and Mycetia. Other previous uncertainties are resolved with strong support; Saprosma is sister to Paederieae s.str. and Carpacoce is sister to remaining Anthospermeae. Our results further reveal some phylogenetic problems. Danaideae is sister to remaining taxa in the Spermacoceae alliance with high posterior probability, which contradicts results in a recent study. The uncertainty concerning evolutionary relationships of Dunnia and Theligonum is reinforced, despite a denser taxon sampling in the Spermacoceae alliance compared with earlier studies. We also demonstrate yet another example of the controversial correlation between molecular substitution rate and plant life history.

  • 6.
    Thureborn, Olle
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och botanik.
    Razafimandimbison, Sylvain G.
    Wikström, Niklas
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och botanik. Royal Swedish Academy of Sciences, Sweden.
    Khodabandeh, Anbar
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och botanik. Royal Swedish Academy of Sciences, Sweden.
    Rydin, Catarina
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och botanik. Royal Swedish Academy of Sciences, Sweden.
    Phylogeny of Anthospermeae of the Coffee Family Inferred Using Clock and Nonclock Models2019Ingår i: International journal of plant sciences, ISSN 1058-5893, E-ISSN 1537-5315, Vol. 180, nr 5, s. 386-402Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Premise of research. With wind-pollinated flowers and partly temperate distribution, the tribe Anthospermeae stands out in the otherwise mostly animal-pollinated and tropical coffee family (Rubiaceae). Nevertheless, few attempts to resolve the phylogeny of the group have been made, and inter- and infrageneric relationships have been only partly addressed. Here we investigate evolutionary relationships and generic and subtribal delimitations of Anthospermeae. We assess the influence of alternative evolutionary rate models on topology and node support. Methodology. Using sequence data from the nuclear (nrITS and nrETS) and plastid (atpB-rbcL, ndhF, rbcL, rps16, and trnT-trnF) genomes collected for a broad sample of taxa, we conducted Bayesian analyses using nonclock, strict clock, and relaxed clock models. The resulting topologies and support values were compared, and the relative fit of evolutionary models to our data was evaluated. Marginal likelihood estimates were used to discriminate between the competing rate models. Pivotal results. The monophyly of Anthospermeae was confirmed with Carpacoce resolved as sister to the remaining species. We found several cases of supported topological conflict between results based on nuclear and plastid data, but the deepest splits of the tribe were congruent among all analyses and incompatible with traditional subtribal delimitations of Anthospermeae. Monophyly of the genera Anthospermum, Nenax, and Coprosma was not supported. While the relaxed clock model was consistently favored over the nonclock and strict clock models for all data sets, the use of the different models had little impact on phylogenetic results. Conclusions. We propose a revised subtribal classification of Anthospermeae, including a new subtribe, the monogeneric Carpacocinae. Introgression/hybridization and incomplete lineage sorting are the most likely causes for the plastid-nuclear incongruences detected for Anthospermeae, but their relative contribution could not be concluded.

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