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      Genetic variation and seed yield in Tunisian castor bean (Ricinus communis L.) Translated title: Variación genética y rendimiento de las semillas en plantas de ricino (Ricinus communis L.) cultivadas en Túnez

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          Abstract

          Abstract: Background and hypothesis: Castor bean (Ricinus communis) is spontaneous in Tunisia with a wide geographical distribution. To study seed morphology we introduced J index as the percent of similarity of seed images to an ovoid. Reduced seed size, J index and color intensity were observed in the population grown in the desert (Martín Gómez et al. 2016). Our objective is to analyze the variability in castor bean grown from seeds obtained from different geographic origins, to describe morphotypes and to find phenotypic parameters to select productive populations. Data description, mathematical model, study site and methods: Seeds collected from twelve populations in 12 Tunisian sites (4 bioclimatic regions) were sown in the experimental field of INRGREF in Gabes (Tunisia). After 10 months, morphological and agronomic characteristics of plants were measured. Morphological traits of seeds were analyzed. Results: Three groups were obtained. The first represented by a single population (northern Tunisia) is characterized by small leaves, large fruit, small seed and early flowering. The second group includes nine populations with intermediate values for fruit and seed dimensions. The third group characterized by reduced fruit length and elevated values of seed length and width. Seed yield varied between populations. Conclusions: Some features of seeds were maintained from the parental generation. Reduced size and color intensity with increased roundness values were maintained in the seeds of the Saharan region. J index values, reflecting the morphological similarity with an ovoid, increased in relation to the previous generation, in general as in particular in the seeds of the Saharan region.

          Translated abstract

          Resumen: Antecedentes e hipótesis: El ricino (Ricinus communis) es espontáneo en Túnez con una amplia distribución geográfica. Para estudiar la morfología de la semilla introdujimos el índice J como el porcentaje de similitud de las imágenes de semillas con un ovoide. Se observó un menor tamaño, índice J e intensidad de color en semillas de la población crecida en el desierto (Martín Gómez et al., 2016). Nuestro objetivo es analizar la variabilidad en cultivos de ricino a partir de semillas obtenidas de diferentes orígenes geográficos, describir morfotipos y encontrar parámetros fenotípicos para seleccionar poblaciones productivas. Descripción de datos y métodos: Se sembraron semillas de doce poblaciones en 12 localidades (4 regiones bioclimáticas) en el campo experimental del INRGREF en Gabes (Túnez). Después de 10 meses, se midieron las características morfológicas y agronómicas de las plantas y se analizaron los rasgos morfológicos de las semillas. Resultados: Se obtuvieron tres grupos. El primero representado por una sola población (norte de Túnez) se caracteriza por hojas pequeñas, frutos grandes, semillas pequeñas y floración temprana. El segundo grupo incluye nueve poblaciones con valores intermedios para las dimensiones de frutos y semillas. El tercer grupo se caracteriza por la reducción de la longitud del fruto y valores elevados de longitud y anchura de la semilla. El rendimiento de semillas varió entre las poblaciones. Conclusiones: Algunas características de las semillas se mantuvieron de la generación parental. Así las semillas de la región sahariana presentaron valores reducidos para el tamaño e intensidad de color. Los valores de índice J, que reflejan la similitud con un ovoide, aumentaron en relación a la generación anterior, tanto en general, como en particular en las semillas de la región del Sáhara.

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          Most cited references24

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          Developing an agro-climatic zoning model to determine potential production areas for castor bean (Ricinus communis L.)

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            Modeling the Arabidopsis seed shape by a cardioid: efficacy of the adjustment with a scale change with factor equal to the Golden Ratio and analysis of seed shape in ethylene mutants.

            A new model for the description of Arabidopsis seed shape based on the comparison of the outline of its longitudinal section with a transformed cardioid is presented. The transformation consists of scaling the horizontal axis by a factor equal to the Golden Ratio. The elongated cardioid approximates the shape of the Arabidopsis seed with more accuracy than other figures. The length to width ratio in wild-type Columbia Arabidopsis dry seeds is close to the Golden Ratio and decreases over the course of imbibition. Dry seeds of etr1-1 mutants presented a reduced length to width ratio. Application of the new model based on the cardioid allows for comparison of shape between wild-type and mutant genotypes, revealing other general alterations in the seeds in ethylene signaling pathway mutants (etr1-1). Copyright 2009 Elsevier GmbH. All rights reserved.
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              Plant height and seed yield of castor (Ricinus communis L.) sprayed with growth retardants and harvest aid chemicals

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                bs
                Botanical Sciences
                Bot. sci
                Sociedad Botánica de México A.C. (México, DF, Mexico )
                2007-4298
                2007-4476
                June 2017
                : 95
                : 2
                : 271-281
                Affiliations
                [3] orgnameUniversity of Gabes orgdiv1Faculty of Sciences of Gabes Tunisia
                [4] orgnameUniversity of Carthage Tunisia
                [1] orgnameUniversity of Carthage Tunisia
                [6] Tunis orgnameEl Manar University orgdiv1Faculty of Science of Tunis Tunisia
                [2] Salamanca orgnameIRNASA-CSIC Spain
                [5] orgnameUniversity of Gafsa orgdiv1Faculty of Sciences of Gafsa Tunisia
                Article
                S2007-42982017000200271
                10.17129/botsci.850
                b0aa4fb9-6a26-47a3-94c6-f1b1b4914cf2

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 05 July 2016
                : 04 October 2016
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 27, Pages: 11
                Product

                SciELO Mexico

                Categories
                Ecology

                Ecology
                Ricinus communis,diversidad,morfología,seed yield,semillas abortadas,diversity,morphology,aborted seeds

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