A new species of Mimosa (Mimosoideae, Leguminosae) from the inter-Andean dry valleys

Mimosa arturoana (Mimosoideae, Leguminosae) is described and illustrated for the first time. This species is similar to the recently published M. lamolina and to the allopatric, Mexican M. deamii, but differs by several morphological characters, such as stems armament, secondary venation of leaflets and pubescence of vegetative organs and pods. This species should be included in the Mimosa sect. Mimosa ser. Mimosa subser. Lactifluae by its characteristic habit, armament of stems, and ecology. This finding increments the diversity of Leguminosae in the dry forests of Inter-Andean valleys of Peru, a potentially center of endemism of this family.Mimosa arturoana (Mimosoideae, Leguminosae) es descripta e ilustrada por primera vez. Esta especie es similar a la recientemente publicada M. lanolina y a la especie alopátrica mexicana M. deamii, pero difiere por varios caracteres morfológicos, como el armamento de los tallos, el indumento, la venación secundaria y pubescencia de los folíolos y frutos. Esta especie debería incluirse en la sección Mimosa serie Mimosa subserie Lactifluae por su hábito de crecimiento, armamento de los tallos y ecología características. Este hallazgo incrementa la diversidad de Leguminosas en los bosques secos de los valles inter-andinos de Perú, un potencial centro de endemismo de la familia.Fil: Morales, Matias. Instituto Nacional de Tecnología Agropecuaria. Centro de Investigación de Recursos Naturales. Instituto de Recursos Biológicos; Argentina. Universidad de Moron. Facultad de Agronomia y Ciencias Agroalimentarias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Fortunato, Renée Hersilia. Instituto Nacional de Tecnología Agropecuaria. Centro de Investigación de Recursos Naturales. Instituto de Recursos Biológicos; Argentina. Universidad de Moron. Facultad de Agronomia y Ciencias Agroalimentarias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

Leaflet trichome micromorphology in the Dolentes-Brevipedes taxonomic complex (Mimosa L., Mimosoideae)

We studied leaflets of 18 taxa of the genus Mimosa, specifically the Dolentes-Brevipedes taxonomic complex, focusing on micromorphology, type, shape, and density of trichomes. Within the nonglandular trichomes we described 3 types of nonbranched and 2 types of branched trichomes. We also described 2 types of stalked glandular trichomes, extending the recent classifications of trichomes in Mimosa. Multiseriate trichomes with lateral projections, which resemble incipient branching, are described here for many taxa. Most studied taxa have pubescent leaflets and show great variability in trichome density values. We also found 3 different types of blade margins with variation in type, alignment, and orientation of trichomes. Results show that the micromorphology of blade trichomes allows distinguishing groups of taxa in this complex, which could be a new tool for performing taxonomic treatment of both subseries.Instituto de Recursos BiológicosFil: Grohar, Mariana Cecilia. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Biodiversidad y Biología Experimental; Argentina.Fil: Rosenfeldt, Sonia. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Biodiversidad y Biología Experimental; ArgentinaFil: Morales, Matias. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Recursos Biológicos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Morón. Facultad de Agronomía y Ciencias Agroalimentarias; Argentin

On the relative projective space

Let (C, ⊗, 1) be an abelian symmetric monoidal category satisfying certain exactness conditions. In this paper we define a presheaf P n C on the category of commutative algebras in C and we prove that this functor is a C-scheme in the sense of B. Toen and M. Vaquié. We give another definition and prove that they give isomorphic C-schemes. This construction gives us a context of non-associative relative algebraic geometry. The most important example of the construction is the octonionic projective spaceFil: Data, Matias Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Matemática; ArgentinaFil: Osorio Morales, Maria Juliana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Investigaciones Matemáticas "Luis A. Santaló". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Matemáticas "Luis A. Santaló"; Argentin

A new polyploid species of Mimosa (leguminosae, mimosoideae) from the highlands of Southern Brazil

Mimosa tucumensis (Leguminosae), a new species from M. sect. Mimosa ser. Mimosa subser. Mimosa is described and illustrated. This taxon is found in southern Brazil (Paran State), in "campos de altitude," an environment different from the typical habitat of other entities in this subseries. Mimosa tucumensis is morphologically close to M. debilis, M. velloziana, and M. sensibilis, but differs from these principally by the presence of humifuse stems with adventitious roots, considerably longer petioles and peduncles, and foliar venation. In addition, cytological characterization of this new taxon is provided and discussed in relation to the nearest species. This taxon appears to be narrowly restricted to grasslands on a handful of closely adjacent peaks in the Paran State adding to the notable endemism of this area. On the basis of morphological, cytological, and geographical data, some evolutionary considerations are inferred.Fil: Morales, Matias. Universidad de Morón; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Ribas, Osmar S.. Museu Botanico Municipal de Curitiba; BrasilFil: Santos Silva, Juliana. Universidade Estadual de Campinas; Brasi

Mimosa diversipila var. subglabriseta (Mimosoideae, Leguminosae), a new record for the flora of Paraguay

Mimosa diversipila var. subglabriseta (Mimosoideae, Leguminosae), una nueva cita para la flora de Paraguay. Reportamos por primera vez la presencia de Mimosa diversipila M. Micheli var. subglabriseta Barneby & Fortunato en Paraguay. Una revisión de la descripción inicial de Barneby y fotografías de uno de los ejemplares de Paraguay se incluyen en este documento.The presence of Mimosa diversipila M. Micheli var. subglabriseta Barneby & Fortunato is now reported for first time in Paraguay. A revision of Barneby’s initial description of the variety and photographs of one of the Paraguayan specimens are given in this paper.Fil: Luna, Javier Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Morales, Matias. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Morón. Facultad de Agronomía y Ciencias Agroalimentarias; ArgentinaFil: Fortunato, Renée Hersilia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Morón. Facultad de Agronomía y Ciencias Agroalimentarias; Argentina. Instituto Nacional de Tecnología Agropecuaria. Centro de Investigación de Recursos Naturales. Instituto de Recursos Biológicos; Argentin

A New Species of Mimosa L. ser. Bipinnatae DC. (Leguminosae) from the Cerrado: Taxonomic and Phylogenetic Insights

Mimosa carolina (Leguminosae), a new species from the Parque Nacional Chapada das Mesas, located in the northern limit of the Brazilian Cerrado, is described and illustrated. In addition, a phylogenetic reconstruction was performed to recover the position of this species in relation to the main clades of the genus Mimosa. This new species is assigned to sect. Habbasia ser. Bipinnatae and exhibits relevant morphological differences with all described species of this series, most notably the prostate habit, glabrous stems, and absence of internal spicules. Our results indicate that this new entity is clearly nested in a strongly supported clade with other striated-corolla species of ser. Bipinnatae. Therefore, ser. Bipinnatae appears to be monophyletic, and a morphologically and ecologically cohesive group within Mimosa. An updated identification key for this series is provided.Fil: Morales, Matias. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Recursos Biológicos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Morón. Facultad de Agronomía y Ciencias Agroalimentarias; ArgentinaFil: Fortunato, Renee Hersilia. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Recursos Biológicos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Morón. Facultad de Agronomía y Ciencias Agroalimentarias; ArgentinaFil: Fragomeni Simon, Marcelo Embrapa Recursos Genéticos e Biotecnologia. Parque Estação Biológica; Brasi

Lectotipificaciones en Mimosa (Leguminosae) del sur de Sudamérica

Se procedió a realizar la lectotipificación de tres especímenes del género Mimosa L. que crecen en Argentina: M. obstrigosa Burkart, M. tandilensis Speg. y M. callosa var. longiracemosa Burkart. Se describe el procedimiento para la elección de los lectotipos.Lectotypifications in Mimosa (Leguminosae) from southern South America. Three taxa of the genus Mimosa (Leguminosae) occurring in Argentina were lectotypified: M. obstrigosa Burkart, M. tandilensis Speg., and M. callosa var. longiracemosa Burkart. The methodology applied to designate the lectotypes is also described.Instituto de Recursos BiológicosFil: Morales, Matias. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Recursos Biológicos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Morón. Facultad de Agronomía y Ciencias Agroalimentarias; ArgentinaFil: Calderón, Franco. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales; Argentin

Fire and flooding resilience in Mimosa L. of the Brazilian Pantanal

PosterThe Pantanal ecoregion, in south-central Brazil, is one of the largest foodplains in the world. Cycles of fooding and periodic fre have been determinant to the diversity of species in the ecoregion. In the fora of Pantanal, Leguminosae is one of the most rich families, and Mimosa is its most diversifed genus. Species of this genus are widely distributed and occur in the capões, sandy ridges and monominant stands (e.g. Cambarazal, Carandazal and Paratudal), in addition to native grasslands and pasture areas. In the Cerrado ecoregion, adaptations to fre have been recognized in some species of Mimosa. However, there is no data in the Pantanal ecoregion about which species of Mimosa are resilient to fre and/or fooding. This study aimed to investigate morphological adaptation in Mimosa in terms of resilience to fre and fooding. We verifed 45 specifc and infraspecifc taxa of Mimosa occurring in the Brazilian Pantanal, by means of the revision of literature, herbarium data, personal observations, plant collections and feld notesInstituto de Recursos BiológicosFil: Nogueira, Luan. Universidade Federal de Mato Grosso do Sul, BrasilFil: Morales, Matias. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Recursos Biológicos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Morón. Facultad de Agronomía y Ciencias Agroalimentarias; ArgentinaFil: Sartori, Angela Lucia. Universidade Federal de Mato Grosso do Sul, Brasi

Karyotype studies in Mimosa (Mimosoideae, Leguminosae) from Southern South America and ecological and taxonomic relationships

In this work we studied the chromosome number and karyotype formula of seven species of Mimosa L. (Mimosoideae, Leguminosae). The chromosome number 2n = 2x = 26 for M. detinens Benth., M. hex- andra M. Micheli, M. ostenii Speg. ex Burkart and M. xanthocentra Mart. var. mansii (Benth.) Barneby are new records, while the chromosome number 2n = 2x = 26 for M. debilis var. debilis, M. urugüensis Hook. and Arn. and M. uliginosa Chodat and Hassl. confirm previous records. Karyotype formulae revealed the existence of metacentric and submetacentric chromosomes, and the chromosomal asymmetry indexes did not show significant differences between taxa. The chromosome length of xerophilous and endemic M. detinens and M. ostenii differed from the rest of species, indicating that this parameter could have taxonomic value. In addition, the relationship between total chromosome length and climatic parameters showed that diploid species of marginal areas of distribution have a larger chromosome size, and that this could be related with mechanisms of ecologi- cal adaptation.Instituto de Recursos BiológicosFil: Morales, Matias. Universidad de Moron. Facultad de Agronomia y Ciencias Agroalimentarias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Wulff, Arturo Federico. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ecología, Genética y Evolución; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Fortunato, Renee Hersilia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Recursos Biológicos; Argentina. Universidad de Morón. Facultad de Agronomía y Ciencias Agroalimentarias; ArgentinaFil: Poggio, Lidia. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ecología, Genética y Evolución; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

Investigating biogeographic patterns of Rhizobium leguminosarum symbiovar viciae within the tribe Fabeae

Presentación en diapositivasNodulation is the symbiotic association of plants and diazotrophic bacteria that results in the formation of specialized organs (nodules) and allows fixation of atmospheric nitrogen. Rhizobial nodulation is widespread in Fabaceae with both promiscuous or exclusive hosts and/or rhizobia existing. An ideal group to explore these patterns is tribe Fabeae. Fabeae includes four genera: Ervilia Link, Ervum L., Vicia L., and Lathyrus L., and around 380 species distributed almost globally. They largely nodulate with Rhizobium leguminosarum symbiovar viciae. With the aim of evaluating the biogeographic patterns of rhizobia that colonize Fabeae species using a broader sampling, the genome of 68 strains of R. leguminosarum symbiovar viciae was sequenced. The nodules were collected from Lathyrus and Vicia hosts growing in Argentina, Canada, Chile, Greece (Crete), Japan, Spain, United Kingdom and United States and cultured to single strains. The DNA was extracted and then sent to MicrobesNG for library preparation and sequencing. Reads were trimmed and draft genomes were assembled. From the contigs, three sets of genes were extracted: (1) 120 non-mobile core genes from the chromosome (2) the 16S rRNA sequence, and (3) the nodulation genes nodA, nodC and nodD. The 16S was highly conserved across the accessions and was not informative to distinguish strains or geographical patterns. However, the set of 120 core genes gave a much more resolved picture allowing genospecies identification and revealing geographical patterns. The preliminary results using the core genes indicate a trend for geographical grouping over large areas. Our analysis consistently retrieved a Japanese clade and a South American clade with the remainder (over 50 accessions) belonging to a very widespread group from Europe and North America. Host plants were generally promiscuous and there was no apparent correlation with the evolutionary phylogeny of the hosts and their choice of rhizobial partners.Instituto de Recursos BiológicosFil: Trad, Rafaela. Royal Botanic Garden Edinburgh, Edinburgo, EscociaFil: Roberts, Sarah. University of California at San Francisco; Estados UnidosFil: Morales, Matias. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Recursos Biológicos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Morón. Facultad de Agronomía y Ciencias Agroalimentarias; ArgentinaFil: James , Euan. Hutton Institute; Reino UnidoFil: Kenicer, Gregory. Royal Botanic Garden Edinburgh; Escoci