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      Caracterización de un cultivar de Stevia rebaudiana (Bertoni) Bertoni (Asteraceae-Eupatorieae) a partir de morfología vegetativa, reproductiva y morfoanatomía foliar Translated title: Characterization of a variety of Stevia rebaudiana (Bertoni) Bertoni (Asteraceae - Eupatorieae) from vegetative and reproductive morphology and morphoanatomy leaf

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          Abstract

          Stevia rebaudiana, originaria del Sudeste de Paraguay y Noroeste de Misiones, presenta en sus hojas ‘steviósidos’ y ‘rebaudiósidos’ con alto poder edulcorante y propiedades farmacológicas. En Venezuela es de reciente cultivo y sus accesiones son poco conocidas. Se caracterizó un cultivar, mantenido en unidades agrícolas familiares en Laguneta de la Montaña, a partir de morfoanatomía foliar y morfología vegetativa-reproductiva. Se describen según la metodología taxonómica convencional. El estudio anatómico se realizó en secciones transversales de hojas y en aclarados paradérmicos con hipoclorito de sodio. Los individuos presentan tallos erectos, cilíndricos, pubescentes. Hojas opuestas decusadas, trinervadas, peciolo alado. Inflorescencias terminales y axilares; corimbos de capítulos con flores blancas diminutas; involucro con cinco filarios desiguales. Fruto cipselas. Hojas bifaciales, anfiestomáticas, índice estomático X= 23,95, índice de empalizada X=2,5. El cultivar de Stevia rebaudiana estudiado presenta características morfológicas y anatómicas similares a los cultivares cercanos genéticamente a la variedad criolla de Paraguay.

          Translated abstract

          Stevia rebaudiana, originating in Southeastern Paraguay and Northwest of Misiones, presents in its leaves ‘steviosides’ and ‘rebaudiosides’ with high sweetening power and pharmacological properties. In Venezuela it is of recent culture and its accessions are unknown. It was characterized a cultivar, maintained in family farms in Laguneta de la Montaña, from foliar morphoanatomy and vegetative-reproductive morphology. They are described according to the conventional taxonomic methodology. The anatomical study was performed in leaf cross sections and in paradermics clarified with sodium hypochlorite. Individuals have erect, cylindrical, pubescent stems. Leaves are opposite decocted, trinervate, winged petiole. Inflorescences, terminal and axillary; inflorescences with tiny white flowers; Involved with five unequal bracts. Fruit is achene. Amphistomatic leaves, stomatal index X = 23.95, palisade parenchyma index X = 2.5. The studied Stevia rebaudiana cultivar presents morphological and anatomical characteristics similar to the cultivars genetically close to the wild variety of Paraguay.

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            Estudios de adaptación y manejo integrado de Estevia (Stevia rebaudiana Bert.): nueva alternativa agroindustrial del Caribe colombiano. Una revisión

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              Chromosomal and morphological studies of diploid and polyploid cytotypes of Stevia rebaudiana (Bertoni) Bertoni (Eupatorieae, Asteraceae)

              In this study, we examined the chromosome number and some morphological features of strains of Stevia rebaudiana. The chromosomes were analyzed during mitosis and diakinesis, and the tetrad normality and pollen viability were also assessed. In addition, stomata and pollen were measured and some plant features were studied morphometrically. All of the strains had 2n = 22, except for two, which had 2n = 33 and 2n = 44. Pairing at diakinesis was n = 11II for all of the diploid strains, whereas the triploid and tetraploid strains had n = 11III and n = 11IV, respectively. Triploid and tetraploid plants had a lower tetrad normality rate than the diploids. All of the strains had inviable pollen. Thus, the higher the ploidy number, the greater the size of the pollen and the stomata, and the lower their number per unit area. The triploid strain produced the shortest plants and the lowest number of inflorescences, whereas the tetraploid strain had the largest leaves. Analysis of variance revealed highly significant differences among the strains, with a positive correlation between the level of ploidy and all of the morphological features examined.
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                Author and article information

                Journal
                ri
                Revista de Investigación
                Revista de Investigación
                2009.Instituto Pedagógico de Caracas. Universidad Pedagógica Experimental Libertador (Caracas, Distrito Capital, Venezuela )
                1010-2914
                December 2017
                : 41
                : 92
                : 95-114
                Affiliations
                [01] orgnameUniversidad Pedagógica Experimental Libertador orgdiv1Instituto Pedagógico de Caracas Venezuela
                [03] Miranda orgnameConsejo Comunal Cordillera del Sur Laguneta de la Montaña Venezuela
                [02] orgnameUniversidad Nacional Experimental Simón Rodríguez Venezuela
                Article
                S1010-29142017000300006 S1010-2914(17)04109200006
                b7139eac-f884-43ff-8c62-eeeb58e30939

                http://creativecommons.org/licenses/by/4.0/

                History
                : April 2017
                : September 2017
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 17, Pages: 20
                Product

                SciELO Venezuela

                Categories
                Investigaciones

                family farm units,Stevia,unidades agrícolas familiares,edulcorante natural,natural sweetener

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