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January 1991 - present
Publications
Publications (69)
Aspidosperma quebracho-blanco is a key species of the Gran Chaco, one of the most threatened subtropical woodlands in South America. By combining ecological niche modeling (ENM) and population genetic analysis, we explored the impact of land use and climate change on the species distribution with the aim to map the geography of its vulnerability an...
Turnera sidoides (x=7) is one of the few well-studied South American autopolyploid complexes. Since polyploidy has played a prominent role within this complex, ongoing studies in T. sidoides focus on understanding the mechanisms involved in the origin and the establishment of polyploids using integrative approaches. This paper synthesises the resul...
Polyploidy is a major force in plant evolution. The possession of more than two chromosome complements may affect the genetic and genomic constitution and the phenotypes of polyploids, having consequences for their ecology, geography and diversification. Here, we used Turnera sidoides autopolyploid complex to assess the effect of polyploidy on geno...
The evolutionary processes that shape the unique biodiversity of the Neotropical Chaquean Domain are still poorly understood, and choosing an appropriate model to address evolutionary questions is essential for understanding the current patterns of Chaquean diversity. We used the Turnera sidoides autopolyploid complex as a model to assess current a...
Saccharum s.l. comprises 35–40 species, including sugarcane (S. officinarum), and is distributed in the tropics and subtropics. The term “Saccharum complex” refers to four related genera: Saccharum, Erianthus s.l. (including E. sect. Ripidium, or Tripidium), Narenga, and Sclerostachya. Miscanthus and Miscanthidium are also closely related to this g...
Tessaria integrifolia Ruiz & Pavón (“aliso de río”, “palo bobo”) es una especie arbórea anfitolerante que forma colonias densas en bosques fluviales de América Neotropical, desde Venezuela hasta el norte-centro de Argentina. Recientemente, se encontraron hojas con características de T. integrifolia en sedimentos holocenos sobre las barrancas del Rí...
The lowlands of mid-latitude South America comprise complex temperate ecoregions characterized by a unique biodiversity. However, the processes responsible for shaping its species diversity are still largely unknown. Turnera sidoides subsp. carnea is a variable subspecies occurring in the lowlands of northeastern Argentina and Uruguay, extending to...
En este informe se presentan los resultados finales de la Identificación de vacíos ecorregiones, cuyo objetivo fue identificar áreas prioritarias para la conservación de la biodiversidad y vacíos de conservación de las ecorregiones Altos Andes, Puna, Monte de Sierras y Bolsones, Espinal, Pampa, Delta e Islas del Paraná, Campos y Malezales, Esteros...
Schizachyrium (Poaceae, Andropogoneae) includes about 60 species distributed in tropical and subtropical regions of the world. In all recent molecular phylogenies of Andropogoneae, representatives of Schizachyrium appear closely related to Andropogon species. The objective of this study was to contribute to the delimitation of Schizachyrium. We per...
A fin de evaluar la utilidad de los estudios genético-poblacionales en la identificación de especies de Schizachyrium y en el papel de la hibridación natural en la evolución de dichas especies, se analizó la variabilidad y estructura genética de S. bimucronatum, S. sanguineum y S. tenerum. La identificación de bandas RAPDs y haplotipos de ADNcp exc...
El Chaco Oriental es una zona de convergencia donde se entremezclan especies de diferente origen. Presenta una gran heterogeneidad ambiental coexistiendo, en pequeñas extensiones,bosques y selvas hidrófilas junto a sabanas y arbustales xerofíticos. Los primeros,caracterizados por la presencia de especies Amazónicas (Provincias Fitogeográficas Paran...
El Chaco Oriental es una llanura constituida por las regiones distales de los abanicos aluviales de los ríos Pilcomayo, Bermejo y Juramento. Geológicamente, es un bloque hundido cubierto con sedimentos (fluviales y eólicos) cuaternarios. Las oscilaciones climáticas y la migración intensiva de los cinturones fluviales durante el Pleistoceno-Holoceno...
Cedrela fissilis Vell., comúnmente llamado “cedro blanco” o “cedro misionero”, es una valiosa especie maderera en peligro de extinción asociada a los bosques estacionales de toda América del Sur. Se distribuye principalmente en Brasil, noreste y noroeste de Argentina, Bolivia y Paraguay. En Brasil, su distribución está asociada a los bosques estaci...
Studies of patterns of genetic diversity, genetic structure and ecological data across geographical ranges of species allow us to test hypotheses about the evolutionary responses of organisms to fluctuations in habitat connectivity and availability. Here we present a study aiming to assess genetic diversity, population structure and breeding system...
Studies of patterns of genetic diversity, genetic structure and ecological data across geographical ranges of species allow us to test hypotheses about the evolutionary responses of organisms to fluctuations in habitat connectivity and availability. Here we present a study aiming to assess genetic diversity, population structure and breeding system...
Aiming to shed light on the influence of Pleistocene geoclimatic events on the current genetic patterns in the flora of the South American Chaqueño Phytogeograpic Domain, we performed phylogeographic and Bayesian ancestral area reconstruction analyses based on plastid DNA sequences of Turnera sidoides. Lineages started to diversify 2.02 Mya,
formin...
Elionurus muticus constituye un valioso recurso renovable; utilizado como forraje, fijador del suelo, aromatizante de ropa, para ahuyentar polillas, como antiséptica, contra la gonorrea y problemas urinarios, para la bronquitis, para curar la lepra, entre otros usos. Además, por su contenido en citral, se lo ha propuesto como sucedáneo de aceites e...
Elionurus muticus constitutes a valuable renewable resource; it is used as forage, soil fixer, clothing flavoring, to drive away moths, as antiseptic, against gonorrhea and urinary problems, for bronchitis, to cure leprosy, among other uses. In addition, due to its citral content, it has been proposed as a surrogate for essential oils, such as citr...
In order to investigate the genomic relationships among species of series Turnera (x= 5), a controlled crossing program was performed and yielded numerous hybrids. Among the yellow flowered species of series Turnera, T. krapovickasii, T. scabra and T. subulata have diploid and autotetraploid cytotypes. So far, the degree of reproductive isolation b...
Twenty-four populations of Turnera sidoides were analysed, using seed storage protein fingerprinting techniques, including 19 populations of Turnera spp. and three of Piriqueta spp. for comparative purposes. The aim was to characterize the T. sidoides complex and to evaluate its profiles as a character to clarify its taxonomic position, as well as...
A phylogenetic study based on the formal barcoding marker for fungi (ITS) was carried out within the Parmotrema clade to evaluate the recent combination of Canoparmelia scrobicularis into Crespoa, and to assess the monophyly of the genus Crespoa. Twenty-six sequences were newly generated, which were analyzed together with 14 retrieved from GenBank,...
Triploids can play an important role in polyploid evolution. However, their frequent sterility is an obstacle for the origin and establishment of neotetraploids. Here we analyzed the microsporogenesis of triploids (x = 7) and the crossability among cytotypes of Turnera sidoides, aiming to test the impact of triploids on the origin and demographic e...
Turnera sidoides is a complex of dystilous perennial rhizomatous herbs with five subspecies in which diploid (2n = 2x = 14) to octoploid (2n = 8x = 56) cytotypes were found. Previous studies have suggested an autopolyploid origin of the complex, and provided evidence for the production of 2n pollen in experimental conditions as well as in natural p...
Turnera krapovickasii is distributed at northwestern Argentina, southern Bolivia and western Paraguay. It presents diploid (2n= 2x= 10) and autotetraploid (2n= 4x= 20) cytotypes. Aiming to interpret the role of autopolyploidy in the evolution of this species, the frequency and spatial distribution of the cytotypes were analyzed. Equal frequencies o...
Turnera krapovickasii se distribuye en el noroeste argentino, sur de Bolivia y oeste de Paraguay. Presenta citotipos diploide (2n= 2x= 10) y autotetraploide (2n= 4x= 20). A fin de interpretar el papel de la autopoliploidía en la evolución de esta especie, se analizaron la frecuencia y distribución espacial de los citotipos. Se detectaron iguales fr...
Turnera sidoides is an autopolyploid complex of obligate outcrossing perennial herbs. It includes five subspecies and five morphotypes in which diploid to octoploid cytotypes were found. Based on phenetic analyses of the complex and karyotype data of polyploid cytotypes, it has been hypothesized that morphological and chromosome differentiation of...
Notolathyrus is a section of South American endemic species of the genus Lathyrus. The origin, phylogenetic relationship and delimitation of some species are still controversial. The present study provides an exhaustive analysis of the karyotypes of approximately half (10) of the species recognized for section Notolathyrus and four outgroups (secti...
Schizachyrium (Poaceae–Andropogoneae) includes ca. 60 species distributed in tropical and subtropical regions of the world. Although the genus has been revised recently for South America, a group of specimens with intermediate traits from Cerrado vegetation of Brazil and Paraguay was found. The aim of this paper is to assess the morphological varia...
The union of 2n gametes has played an important role in the origin of polyploids of Turnera sidoides. Notwithstanding, owing to the lower rate of neopolyploid formation in this complex, their establishment constitute a critical step. Considering that the evolutionary dynamics of polyploids depends in great part on the frequency of 2n gametes produc...
La unión de gametos 2n ha tenido un importante papel en el origen de los poliploides de Turnera sidoides. Sin embargo, como en este complejo la tasa de formación de neopoliploides es baja, el establecimiento de los mismos constituiría una etapa crítica. Considerando que la dinámica evolutiva de los poliploides depende en gran medida de la frecuenci...
Premise of research. The geographical distribution of ploidy levels provides insights into evolutionary pathways. For the subtropical tree line species Polylepis australis (Rosaceae), we tested the hypotheses that (1a) incidence of polyploidy is higher in the northern parts than in the southern parts of the species range due to the presence of rela...
Turnera sidoides (x = 7) is an autopolyploid complex of outcrossing perennial herbs that includes five subspecies, with ploidy levels from diploid (2n = 2x = 14) to octoploid (2n = 8x = 56). Previous studies have revealed the production of unreduced male gametes (2n and 4n) in diploid populations of this complex, suggesting that sexual polyploidyza...
Turnera sidoides (x = 7) es un complejo autopoliploide de hierbas alógamas perennes que incluye cinco subespecies, con niveles de ploidía desde diploide (2n = 2x = 14) hasta octoploide (2n = 8x = 56). Estudios previos aportaron evidencias de la producción de gametos masculinos no reducidos (2n y 4n) en poblaciones diploides del complejo, sugiriendo...
The genome size was surveyed in 13 Notolathyrus species endemic to South America by flow cytometry and analyzed in an evolutionary and biogeographic context. A DNA content variation of 1.7-fold was registered, and four groups of species with different DNA content were determined. Although, the 2C values were correlated with the total chromosome len...
Turnera sidoides is a complex of outcrossing, perennial, rhizomatous herbs that is widely distributed in southern South America. Five subspecies are recognized taxonomically based on morphological features and geographical distribution. In certain regions, the areas of distribution of the subspecies overlap partially. In such contact zones, the ext...
Understanding the spatiotemporal distribution of genetic variation and the ways in which this distribution is connected to the ecological context of natural populations is fundamental for understanding the nature and mode of intraspecific and, ultimately, interspecific differentiation. The Petunia axillaris complex is endemic to the grasslands of s...
Turnera sidoides is a complex of distylous perennial rhizomatous herbs that includes five subspecies. Since polyploidy has played a prominent role within this species (x = 7), ongoing studies in T. sidoides are focused on the understanding of the mechanisms involved in the origin and the establishment of polyploids. Therefore, aiming to contribute...
Knowledge of the chromosome variation in wild populations is essential to understand the pathways and restrictions of karyotype evolution in plants. The aim of this study is to conduct an intraspecific analysis of the karyotypes by fluorochrome banding and ribosomal DNA (rDNA) loci detection by fluorescent in situ hybridization (FISH) and of the me...
Chromosome numbers are reported here for 53 accessions belonging to 13 taxa of the genus Schizachyrium. The chromosome counts for the following seven species are recorded here for the first time: S. bimucronatum (2n=20), S. gracilipes (2n=20), S. hatschbachii (2n=20), S. lactiflorum (2n=20), S. plumigerum (2n=20), S. salzmannii (2n=20; 2n=40) and S...
Se han estudiado los cromosomas mitóticos de quince especies de Serjania Mill., con 2n = 24, de América del Sur. Los resultados incluyen los primeros recuentos de S. paludosa Cambess. y S. setigera Radlk. Fueron analizados los cariotipos de todas las especies, trece de ellos se describen por primera vez. Aunque no ha habido ningún cambio en el núme...
Se describe el cariotipo de 6 especies de Turnera. El cariotipo de T.melochioides (Leiocarpae), 2n = 2x = 14, está compuesta por 10 m + 4sm. En T.grandiflora, T.candida, T.scabra, T.hermannioides y T.Joelii (Canaligerae), todos con 2n = 2x = 10, la fórmula cariotípica es 8m + 2sm. Estas especies se distinguen por la longitud del cromosoma, el tamañ...
En el presente trabajo se informa por primera vez el número de cromosomas de 5 especies y 1 variedad de Turnera. Se confirman previos reported en 5 taxones . Los cariotipos de 16 taxones de Turnera se describen por primera vez. Los resultados del análisis de los cromosomas son los siguientes: T.weddelliana, 2n = 2x = 14 = 12m 2sm; T.pumilea, 2n = 2...
En el marco de los estudios evolutivos que se desarrollan en el complejo autopoliploideTurnera sidoides (x= 7) se realizó un muestreo sistemático en el noroeste de su área dedistribución. Se hallaron 6 poblaciones con flores de color salmón y 35 con flores amarillas dela subsp. pinnatifida. La distribución de estas poblaciones está asociada con var...
Cytogeographical variability among 564 plants from 26 populations of Turnera sidoides subsp. pinnatifida in mountain ranges of central Argentina was analysed with meiotic chromosome counts and flow cytometry and is described at regional and local scales. Populations were primarily tetraploids (2n = 4x = 28), although diploid (2n = 2x = 14), hexaplo...
With the objective of contributing to understanding the patterns of variation within the Turnera sidoides complex, a detailed evaluation of morphological variation along the range of T. sidoides subsp. pinnatifida was performed. A multivariate analysis based on leaf traits and flower colour data enabled differentiation of five morphotypes.
Common-g...
Effects of grazing and environment on vegetation structure have been widely acknowledged, but few studies have related both factors. We made 57 floristic samples in a highly variable landscape of mountain grasslands in central Argentina; 26 sample were in fence-lines with contrasting vegetation. For each sample, we recorded topographic and edaphic...
Our aim was to assess the degree of morphological differentiation of a group of taxa of Schizachyrium Nees, which presents similar inflorescences and shares habitat and geographic areas: Schizachyrium bimucronatum, S. condensatum, S. lactiflorum, S. microstachyum subsp. microstachyum, S. microstachyum subsp. elongatum, and S. plumigerum. To accompl...
Analysis of the production and frequency of unreduced microspores in diploids of Turnera sidoides (Turneraceae). Turnera sidoides is a polyploid complex (x= 7) of dystilous perennial rhizomatous herbs that includes five subspecies. Owing to the high frequency of polyploids within the complex, ongoing studies in T. sidoides are focused on the unders...
New chromosome number determinations are presented for 48 populations of five subspecies of Turnera sidoides. Chromosome counts in sspp. carnea, holosericea, integrifolia and sidoides confirm previous data while, in ssp. pinnatifida, the numbers 2n=2x = 14 and 2n = 6x = 42 are reported for the first time. The results show that polyploidy is a very...
Schizachyrium sulcatum, distributed in Brazil, Bolivia and Colombia, is described, illustrated, and reported for the first time from Peru and Venezuela.
Synonymy, geographical distribution, ecology, and a list of representative specimens examined are provided. Characters of
taxonomic value are established in order to differentiate this species from...
Aim To analyse the current geographical structure of chloroplast DNA variation in the Turnera sidoides L. complex in order to establish historical biogeographical hypotheses for the mid-latitude South American lowlands. During the Quaternary, the climate shifted from tropical humid to cold dry, and the vegetation cover has not been stable. The cons...
A detailed analysis of the karyotype and the meiotic behavior of the South American endemic Lathyrus hasslerianus is provided in this study. The karyotype obtained is the most asymmetrical of section Notolathyrus, which together with the particular morphological characters and ecological requirements supports a derived state of this species. Meioti...
The mechanism of polyad formation in Mimosa bimucronata (DC.) Kuntze is described and its significance in the reproductive biology is discussed. In this species c. 500 complexes of two coupled pollen mother cells (PMCs) per pollen sac are formed after the last mitotic division of the sporogenous tissue. All the pollen grains of each complex remain...
In the context of the evolutionary studies that are being carried out in Turners sidoides autopolyploid complex (x= 7), a systematic survey was made in the northwestern area (Bolivia) of its distribution. Six populations with salmon flowers and thirty five with yellow ones of the subsp. pinnatifida were found. The distribution of these populations...
Interspecific crosses between two species of the Turnera ulmifolia complex with yellow flowers have been carried out. As a result, two hybrids were obtained: T. krapovickasii (K4) x T. ulmifolia (U), 2n = 4x=20 and T. ulmifolia (U) x T. krapovickasii (K5), 2n = 5x=25. The hybrids were cytologically studied in order to determine their genomic relati...
div> En el marco de los estudios evolutivos que se desarrollan en el complejo autopoliploide Turnera sidoides (x= 7) se realizó un muestreo sistemático en el noroeste de su área de distribución. Se hallaron 6 poblaciones con flores de color salmón y 35 con flores amarillas de la subsp. pinnatifida. La distribución de estas poblaciones está asociada...
This study constitutes the first investigation of cyanogenesis variation within the Turnera sidoides autopolyploid complex. The qualitative and quantitative analysis carried out in 38 populations showed that the five subspecies of the complex are cyanogenic, although the levels of cyanide released varied both between and within subspecies. Between...
Se ha ajustado un procedimiento para la regeneración de plantas
de mandioca (Manihot esculenta) vía embriogénesis somática a partir
del cultivo de hojas inmaduras de clones de interés para la Argentina
mantenidos in vitro. A partir de estos explantes se pudo diferenciar
embriones somáticos en un medio de Murashige y Skoog (MS) suplementado con 2 %...
Turnera sidoides, with the most southerly distribution of all Turnera species in America, is a complex of obligately outcrossing perennial herbs. Karyotypes of the five subspecies of T. sidoides (x = 7) are described for the first time utilizing root-tip mitotic metaphases. Different ploidy levels were found for all of the subspecies, ranging from...
The karyotypes of four species of South American Paullinieae-Sapindaceae are analized for the first time: Paullinia coriacea, 2n= 24= 16m + 6sm + 2st; Serjania cissoides, 2n= 24= 18m + 2sm + 4st ; S. suborbicularis, 2n= 24= 12m + 8sm + 4st and the diploid cytotype of U. ulmacea 2n= 2x= 22= 16m + 6sm. The significance of the results are discussed in...
New chromosome number determinations are presented for 48 populations of five subspecies of Turnera sidoides. Chromosome counts in sspp. carnea, holosericea, integrifolia and sidoides confirm previous data while, in ssp. pinnatifida, the numbers 2 n=2x=14 and 2n =6x=42 are reported for the first time. The results show that polyploidy is a very freq...
The genus Turnera is one of the most important genera of the Turneraceae comprising more than 100 species grouped in 9 series which are distributed largely in tropical and subtropical areas of the Americas. At least 34% of all species have been karyologically investigated. Chromosome numbers have been reported for 35 species but the karyotypes of o...
ANTECEDENTES El género Turnera es el más numeroso y el más estudiado citológicamente de la familia. El número básico más frecuente es x=7 (series Salicifolieae, Stenodictyae, Mycrophyllae y Leiocarpae) encontrándose x=13 en la serie monotípica Papilliferae y x=5 en la serie Turnera (Fernández, 1987). La poliploidía desempeñó un papel importante en...
INTRODUCCION Los moluscos fósiles existentes en los sedimentos del Terciario Superior del noroeste argentino son numerosos, tanto en cantidad de ejemplares como en variedad de taxones (Morton, 1984,1986, Morton, 1998, Morton y Herbst, 2003). Sin embargo, la información paleontológica disponible de la región de los valles Calchaquíes es aún escasa....
1.Facultad de Ciencias Agrarias (UNNE) 2.Facultad de Ciencias Exactas y Naturales y Agrimensura (UNNE). 3.Instituto de Botánica del Nordeste (UNNE-CONICET). (3400) Corrientes -Argentina. Teléfono/Fax: ANTECEDENTES Turnera sidoides es una hierba perenne distribuida en el sur de Bolivia y Paraguay y Brasil, así como en la mayor parte del territorio d...
Cs. Exactas y Naturales y Agrimensura -UNNE. Av. Libertad 5450 -(3400) Corrientes -Argentina. 3. Instituto de Botánica del Nordeste (IBONE) -Facultad de Cs. Agrarias -UNNE. Sargento Cabral 2131 -(3400) Corrientes -Argentina. Tel./Fax: ANTECEDENTES La poliploidía es un proceso eminente en el reino vegetal (Stebbins 1971, Grant 1989). Evidencias reci...
