RIUNNE Repositorio Institucional de la Universidad Nacional del Nordeste: Envíos recientes
Mostrando ítems 281-300 de 15991
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Karyotype stability and genome-specific nucleolar dominance in peanut, its wild 4 ancestor, and a synthetic AABB polyploid
(Crop Science Society of America, 2018-07)Allopolyploidy is a significant evolutionary process involved in the origin of many crops, including peanut (Arachis hypogaea L.). The process usually results in a series of chromo- some, genomic and epigenetic rearrangements ... -
High temperatures around flowering in maize : effects on photosynthesis and grain yield in three genotypes
(Crop Science Society of America, 2016-09)To aid breeding for heat-tolerant germplasm we analyzed the effects of high temperatures on the CO2 exchange rate (CER), crop growth rate (CGR), kernel number (KN), and grain yield (GY) in a 30-d period bracketing flowering. ... -
Occurrence of 2n microspore production in diploid interspecific hybrids between the wild parental species of peanut (Arachis hypogaea L., Leguminosae) and its relevance in the genetic origin of the cultigen
(Crop Science Society of America, 2020-06)Unreduced (2n) gametes are the driving force that leads to polyploidization of plants in nature and an important tool for ploidy breeding. Peanut (Arachis hypogaea L., Leguminosae) seems most likely to have originated by ... -
Breeding tetraploid Paspalum simplex : hybridization, early identification of apomicts, and impact of apomixis on hybrid performance
(Crop Science Society of America, 2019-03)Apomictic grasses predominate among tropical forages, and specific breeding techniques are needed for their genetic improvement. The objectives of this study were (i) to generate hybrids by crossing tetraploid sexual and ... -
Mode of reproduction and meiotic chromosome behavior in acroceras macrum
(Crop Science Society of America, 2020-01)Acroceras macrum Stapf is a high-quality C3 grass species adapted to the subtropics. It is a valuable forage resource in frequently flooded environments. The objectives were to analyze the type of polyploidy, mode of ... -
The role of triploids in the origin and evolution of polyploids of Turnera sidoides complex (Passifloraceae, Turneroideae)
(Sociedad Botánica de Japón, 2017-08-22)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) ... -
Evidence of 2n microspore production in a natural diploid population of Turnera sidoides subsp. carnea and its relevance in the evolution of the T. sidoides (Turneraceae) autopolyploid complex
(Sociedad Botánica de Japón, 2012-05-31)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 ... -
Perianth organs in Nymphaeaceae : comparative study on epidermal and structural characters
(Sociedad Botánica de Japón, 2017-07-21)The perianth organs of six species of Nymphaeaceae, representing Euryale, Nymphaea and Victoria, were studied on the basis of macroscopical, micromorphological, and anatomical characters. The aims were to determine whether ... -
DNA content in South American endemic species of Lathyrus
(Sociedad Botánica de Japón, 2014-05-20)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 ... -
Relative DNA content in diploid, polyploid, and multiploid species of Paspalum (Poaceae) with relation to reproductive mode and taxonomy
(Sociedad Botánica de Japón, 2016-03-10)It is generally accepted that polyploids have downsized basic genomes rather than additive values with respect to their related diploids. Changes in genome size have been reported in correlation with several biological ... -
Karyotype characterization and evolution in South American species of Lathyrus (Notolathyrus, Leguminosae) evidenced by heterochromatin and rDNA mapping
(Sociedad Botánica de Japón, 2015-06-28)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 ... -
Diferential DNA methylation and gene expression during development of reproductive and vegetative organs in Ilex species
(Sociedad Botánica de Japón, 2021-03-23)Diferential epigenetic (DNA cytosine methylation) and gene expression patterns were investigated in reproductive and veg- etative organs from Ilex paraguariensis and I. dumosa, at distinct developmental stages. We aimed ... -
Considerations on the genus Schizachyrium (Poaceae–Andropogoneae) in Central America and West Indies, and confirmation of the occurrence of S. glaziovii
(Magnolia Press, 2015-02-25)Schizachyrium (Poaceae–Andropogoneae) incluye cerca de 60 especies, 10 de las cuales fueron previamente citadas para América Central y 13 especies para las Indias Occidentales. En este trabajo se reporta la presencia de ... -
Bulbostylis litoreamazonicola, a new species of Cyperaceae from the Brazilian Amazonian coast
(Magnolia Press, 2022-01-10)A new species of Bulbostylis (Cyperaceae), only known from the Brazilian Amazonian coast, is here described and illustrated. Bulbostylis litoreamazonicola was found growing over dunes, in seasonally flooded restinga ... -
A new variety of Schizachyrium (Poaceae : Andropogoneae) from South America, with notes on the infraspecific taxa of Schizachyrium tenerum
(Magnolia Press, 2019-05-09)A new variety of Schizachyrium tenerum from South America is described and illustrated. The new taxon (S. tenerum var. muticum) differs from the other varieties of the species (S. tenerum var. tenerum and S. tenerum var. ... -
A taxonomic revision of the genus Bacopa (Gratioleae, Plantaginaceae) in Argentina
(Magnolia Press, 2018-01-26)In the present work a revision of Bacopa for Argentina is presented. In this country the genus is integrated by twelve native taxa: eleven species and one variety. Full descriptions, along with distribution information, ... -
Taxonomic position and identity of Stemodia scoparioides (Gratiolae, Plantaginaceae)
(Magnolia Press, 2013-10-01)In recent floristic and taxonomic studies, Stemodia scoparioides (Gratiolae, Plantaginaceae) has been considered a synonym of S. lanceolata or a synonym of S. stricta. However, a detailed analysis of the type material and ... -
Stemodia diplohyptoides (Plantaginaceae, Gratiolae) : a new diploid species from South America
(Magnolia Press, 2014-12-04)Stemodia diplohyptoides (Plantaginaceae), a new species from Gratiolae tribe is described and illustrated. This taxon is found in northeastern Argentina, at the edge of the Parana River that surrounds the north and center ... -
Pholiota oblita, new species in sect. Adiposae stirps Subflammans (Strophariaceae, Agaricomycetes), from the Argentinean Yungas
(Magnolia Press, 2014-05-14)We present a study on the genus Pholiota sect. Adiposae stirps Subflammans from the Republic of Argentina. Pholiota oblita is proposed as a new species. It is characterized by its narrow lamellae, elongated cheilocystidia ... -
Geographic variation of Serjania perulacea (Paullinieae, Sapindaceae) and description of two new varieties
(Magnolia Press, 2017-7-11)We assessed the morphological diversity of Serjania perulacea using multivariate analyses (principal coordinates and component analysis) of quantitative and qualitative morphological leaf traits. We also investigated the ...
