Emilio Cervantes

Emilio Cervantes
Spanish National Research Council | CSIC · Institute of Natural Resources and Agrobiology of Salamanca

Ph D Biology
Morphological analysis of seeds based on the comparison with geometric models

About

129
Publications
46,432
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Introduction
Natural Selection, survival of the fittest in the best definition, is the nuclear idea of darwinism. A tautology that generates much confusion and contradictory in itself (Nature does not select). Undefined by Darwin, remains undefined by darwinism and by so called evolutionary synthesis. A semantic ghost preventing understanding of evolution. Doublethink. In 1984 Orwell predicted proliferation of ambiguous terms (Newspeak dictionary) Today we see many examples . I prosecute semantic ghosts.
Additional affiliations
September 1991 - February 1997
Universidad de Salamanca
Position
  • Professor (Associate)
February 1988 - February 1990
University of Geneva
Position
  • Maître Assitant
November 1987 - December 1988

Publications

Publications (129)
Article
Full-text available
Modern methods of image analysis are based on the coordinates of the points making the silhouette of an image and allow the comparison between seed shape in different species and varieties. Nevertheless, these methods miss an important reference point because they do not take into consideration the similarity of seeds with geometrical figures. We p...
Article
Full-text available
Fruit and seed shape are important characteristics in taxonomy providing information on ecological, nutritional, and developmental aspects, but their application requires quantification. We propose a method for seed shape quantification based on the comparison of the bi-dimensional images of the seeds with geometric figures. J index is the percent...
Article
Full-text available
Seed description in morphology is often based on adjectives such as “spherical”, “globular”, or “reniform”, but this does not provide a quantitative method. A new morphological approach based on the comparison of seed images with geometric models provides a seed description in Silene species on a quantitative basis. The novelty of the proposed meth...
Article
Full-text available
Ampelography, the botanical discipline dedicated to the identification and classification of grapevine cultivars, was grounded on the description of morphological characters and more recently is based on the application of DNA polymorphisms. New methods of image analysis may help to optimize morphological approaches in ampelography. The objective o...
Article
Full-text available
The Vitaceae Juss., in the basal lineages of Rosids, contains sixteen genera and 950 species, mainly of tropical lianas. The family has been divided in five tribes: Ampelopsideae, Cisseae, Cayratieae, Parthenocisseae and Viteae. Seed shape is variable in this family. Based on new models derived from equations representing heart and water drop curve...
Article
Full-text available
The description of shape in Silene seeds is based on adjectives coined by naturalists in the 19th century. The expressions reniform, dorso plana, and dorso canaliculata were applied in reference to lateral or dorsal views of seeds, but the characters described can be submitted now to an analytical description by quantitative methods, allowing shape...
Article
Full-text available
The description of seed shape by comparison with geometric models allows shape quantification, providing the means for an accurate comparison between different species or populations. Geometric models described for the lateral and dorsal views of the seeds of Silene species are applied to the quantification of the shape in the seeds belonging to tw...
Article
Full-text available
Seed shape in Silene species is often described by means of adjectives such as reniform, globose, and orbicular, but the application of seed shape for species classification requires quantification. A method for the description and quantification of seed shape consists in the comparison with geometric models. Geometric models based on mathematical...
Article
Full-text available
Seed shape in species of the Cactaceae is described by comparison with geometric models. Three new groups of models are presented, two for symmetric seeds, and a third group for asymmetric seeds. The first two groups correspond, respectively, to superellipses and the combined equations of two semi-ellipses. The third group contains models derived f...
Preprint
Full-text available
Ampelography, the botanical discipline dedicated to the identification and classification of grapevine cultivars, was grounded on the description of morphological characters and more recently is based on the application of DNA polymorphisms. New methods of image analysis may help to optimize morphological approaches in ampelography. The objective o...
Book
Full-text available
A lo largo de los siglos, el Valle del Cidacos (La Rioja, España) ha sido testigo de la historia. Esta obra propone un acercamiento multidisciplinar a este valle riojano, con detalladas descripciones de lugares y personas que pueden ayudar a planificar itinerarios lúdicos y culturales para viajeros interesados en la historia local y las ciencias na...
Article
Full-text available
This article deals with the morphology (length, diameter and weight) of the acorns of Quercus suber L. collected from seven sites chosen according to an altitudinal gradient in northwestern Tunisia. The study looked at 31 trees and 2327 acorns. The comparative study showed that there are significant differences between trees at the station scale an...
Article
Full-text available
Morphometric methods based on artificial vision algorithms provide measurements for magnitudes descriptive of seed images (i.e., the length, width, area, and surface circularity index). Nevertheless, their results frequently omit the resemblance of the images to geometric figures that may be used as models. A complementary method based on the compa...
Article
Seed shape in the order Ranunculales is described with the objective of characterizing the morphological seed types in the families of this order and to establish a correlation between seed shape, plant structure and life style. Based on previous work in model plants (Arabidopsis thaliana, Lotus japonicus, Medicago truncatula), we have used the J i...
Chapter
Seed shape quantification has many applications in plant science and agronomy. Digital technologies have allowed the development of new quantification methods based on the comparison of images with geometric models. Image processing systems are used in the automatic determination of seed size and shape, becoming a basic tool in the study of diversi...
Article
Full-text available
Datasets containing information on seed size have been published and are currently available. Nevertheless, there is a lack in the literature of a dataset dedicated to seed shape. We present a preliminary version for a dataset on seed morphology based on a comparison of seed shape with geometric figures. Similarity of the outline of seed images wit...
Article
Full-text available
Modern automated and semi-automated methods of shape analysis depart from the coordinates of the points in the outline of a figure and obtain, based on artificial vision algorithms, descriptive parameters (i.e., the length, width, area, and circularity index). These methods omit an important factor: the resemblance of the examined images to a geome...
Article
Full-text available
Seed shape in the Malvaceae and other families of the order Malvales was investigated. Seed shape was quantified by comparison with the cardioid. The J index is the percent similarity between both images, the seed and the cardioid, and similarity is considered in cases where the J index is over 90. Seed shape was analysed in 73 genera, and seeds re...
Chapter
The molecular mechanisms underlying seed dormancy and germination have been investigated traditionally in model systems, mainly Arabidopsis thaliana. Research has been fruitful uncovering a complex network of interactions between hormones and new molecular mechanisms, such as for example those based in small RNAs, but model plants are small annuals...
Article
Full-text available
Seed shape quantification in diverse species of the families belonging to the order Cucurbitales is done based in the comparison of seed images with geometric figures. Quantification of seed shape is a useful tool in plant description for phenotypic characterization and taxonomic analysis. J index gives the percent of similarity of the image of a s...
Book
Full-text available
La nave de los locos, además de un famoso cuadro de El Bosco, es el título de una obra del teólogo, jurista y humanista Sebastian Brand publicada en Basilea en 1494. En sus páginas dice: The world loves to be deceived. (El mundo se complace en ser engañado) Afirmación confirmada en los últimos ciento sesenta años por el éxito de la obra de Darwin...
Article
Full-text available
Rhus tripartita (Ucria) Grande (Anacardiaceae) is a rare and endangered species. Seeds of Rhus tripartita were obtained from spontaneous populations in nine different localizations in Tunisia and their shape analyzed by image analysis. Seeds were harvested in 2014 and image analysis was done in CSIC laboratories (Salamanca, Spain). The method for s...
Article
Full-text available
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. 201...
Article
Full-text available
The olive tree is represented in Tunisia by two varieties: var. sylvestris (wild olive trees) and var. europaea (cultivated olive trees including diverse cultivars). Seed (stone) size and shape analysis may provide the basis for relationships between varieties and cultivars as well as to study the responses to environmental conditions. A semi-autom...
Chapter
Castor bean (Ricinus communis L.; fam. Euphorbiaceae) is a perennial evergreen shrub cultivated in tropical and subtropical regions. It is an oilseed crop with important value in industry, pharmaceutical and biofuel sectors. The seed is a source of protein and oil; and it is considered a vital industrial raw material. Oil yield in seeds is about 50...
Book
Full-text available
El triunfo, el éxito de una obra o de un autor científico, no siempre es resultado de una aportación real a los campos del conocimiento, sino que a menudo es debido a una oportunidad histórica: Encontrarse en el lugar adecuado en el momento preciso. Por ejemplo el libro principal de Darwin y fundador del darwinismo se titula Sobre el Origen de las...
Article
Full-text available
Seed shape quantification is an important tool in taxonomy and biodiversity studies. Seed images are compared with geometric figures and percent of identity is obtained (J index). Seed images of Arabidopsis and model legumes (Lotus and Medicago) adjust well to a cardioid allowing studies of shape variation in development and germination and mutant...
Article
Continental Mediterranean forests face drought but also cold spells and both climate extremes can impair the resilience capacity of these forests. Climate warming could amplify the negative effects of cold spells by inducing premature dehardening. Here we capitalize on a winter drought-induced dieback triggered by a cold spell which occurred in Dec...
Article
Full-text available
Morphological variation in seed characters includes differences in seed size and shape. Seed shape is an important trait in plant identification and classification. In addition it has agronomic importance because it reflects genetic, physiological, and ecological components and affects yield, quality, and market price. The use of digital technologi...
Chapter
Jatropha curcas L. or physic nut (Euphorbiaceae) is a perennial, deciduous, stemsucculent shrub native of Central America and cultivated in America, Africa and Asia. Drought tolerant, it grows in tropical and subtropical regions and in degraded soils having a significant agronomic, environmental, medicinal and economic potential. J. curcas is an ol...
Article
Full-text available
Mitochondrial morphology and evolution have been observed during seed germination and early seedling development in Arabidopsis thaliana line 43a9 (ecotype Columbia) expressing green fluorescent protein in these organelles. Fluorescence, confocal and electronic microscopy images reveal that mitochondrial development goes through different stages, a...
Book
Full-text available
Esta obra se presentan diferentes debates científicos en torno a la obra de naturalistas de los siglos XVIII, XIX y XX: Lamarck, Darwin, Casimiro Gómez Ortega, Antonio José Cavanilles, el padre Vicente Solano, Mariano de la Paz Graells, Casiano de Prado, Víctor López Seoane, José Arévalo Baca, Ramón y Cajal, y Eduardo Hernández-Pacheco. Se discute...
Book
Full-text available
En múltiples ocasiones a lo largo de su obra principal repite Darwin una frase en latín: Natura non facit saltum. El poder de persuasión de la lengua latina nos convence y admitimos: La naturaleza no da saltos. En sentido literal esto es cierto y lo contrario sería una prosopopeya, personificación. Pero entonces,… ¿por qué el mismo autor pone tanto...
Article
Full-text available
Eight accessions of Jatropha curcas (six American and two African) were sown in the south of Tunisia (Gabès) to study its agricultural properties and development under local semi-arid conditions. Traits observed included general aspects of plant development (plant height, canopy circumference, number of nodes and seed yield); leaf characteristics (...
Chapter
The study concerns the effect of the aqueous extract of physic nut (Jatropha curcas L.) on the germination of six cultivated crops: Hordeum vulgare L., Medicago sativa L., Corchorus olitorius L., Trigonella foenum-graecum L., Lens culinaris L. and Cicer arietinum L. The extracts were obtained after an incubation of the dry plant material in distill...
Article
Full-text available
Eight accessions of Jatropha curcas (six American and two African) were sown in the south of Tunisia (Gabes) to study its agricultural properties and development under local semi-arid conditions. Traits observed included general aspects of plant development (plant height, canopy circumference, number of nodes and seed yield); leaf characteristics (...
Article
Full-text available
El análisis morfológico de las semillas de la alcaparra arroja luz sobre las estrategias adaptativas de esta planta.
Technical Report
Full-text available
Este comentario fue rechazado por dos revistas de Historia de la Ciencia: Llull y Asclepio. Uno de los motivos para rechazarlo era que se refería a un libro ya antiguo (el libro es de 1994) y que, por lo general, se publican comentarios de libros recientes. Pero además, entre los comentarios recibidos se encontraba lo siguiente: En realidad, el li...
Article
Full-text available
In a previous work, the shape of Arabidopsis seed was described as a cardioid modified by a factor of Phi. In addition, J index was defined as the similarity of the seed (in an orthogonal, bi-dimensional image) to a cardioid, thus allowing the quantitative comparison of seed shape in seeds of varieties and mutants at different stages of development...
Article
Full-text available
Morphological description of seeds is a required step for analysis of biodiversity in natural populations and may give clues to adaptive strategies in species evolution. The cardioid is the curve described by a point of one circumference rolling around another circumference of equal radius. Models based on adjustment of seed shape with cardioid cur...
Article
Full-text available
Identification of the causal agent of the disease “amachamiento” of common bean was carried out using four tests: analysis of double strand RNA (dsRNA) of viral origin, DAS-ELISA technique, applying Koch’s postulates and the pathogenicity test. The analysis to detect dsRNA brought about two bands of approximately 1100 and 3200 bp, a similar pattern...
Article
Full-text available
Identification of the causal agent of the disease "amachamiento" of common bean was carried out using four tests: analysis of double strand RNA (dsRNA) of viral origin, DAS-ELISA technique, applying Koch's postulates and the pathogenicity test. The analysis to detect dsRNA brought about two bands of approximately 1100 and 3200 bp, a similar pattern...
Article
Full-text available
El capítulo cuarto de OSMNS, titulado la Selección Natural o la Supervivencia de los más Aptos contiene lo que podríamos esperar que iba a ser la parte central de la obra: La Exposición de la “Teoría” que nos explique el origen de las especies. Porque esa y no otra es la función de toda Teoría Científica: Explicar. Caben dos posibilidades: 1, que l...
Article
Seed shape in the model legumes Lotus japonicus and Medicago truncatula is described. Based in previous work with Arabidopsis, the outline of the longitudinal sections of seeds is compared with a cardioid curve. L. japonicus seeds adjust well to an unmodified cardioid, whereas accurate adjustment in M. truncatula is obtained by the simple transform...
Article
Full-text available
Randomly amplified polymorphic DNA (RAPD) analysis was used to investigate the diversity of 179 bean isolates recovered from six field sites in the Arcos de Valdevez region of northwestern Portugal. The isolates were divided into 6 groups based on the fingerprint patterns that were obtained. Representatives for each group were selected for sequence...
Article
Full-text available
Así termina la novela El nombre de la rosa, de Umberto Eco: permanece el nombre de la rosa prístina, lo que tenemos son las palabras desnudas, única vía para entendernos y comprender al mundo. Curiosamente, en estos tiempos en los que la Ciencia pone todo su empeño en la aplicación y la rentabilidad de sus resultados es cuando se demuestra que nada...
Book
En sentido estricto, el proscrito es un desterrado; en sentido figurado, el proscrito lo es de los contornos no menos reales de una estructura de poder. El mundo académico no es una excepción. Para la investigación, la esencia del proscrito es la independencia de pensamiento, costumbre que consiste en cultivar opiniones propias. La clave de la labo...
Article
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 accur...
Article
Full-text available
Treatment with hydrogen peroxide has notable effects in the morphology of the root apex in Arabidopsis seedlings. The result was described as consisting in two aspects: first, a reduction in curvature values in the root profile. Second, alterations in size and shape of the cells in the root cap. Cells of the root cap were smaller and had higher cir...
Article
Full-text available
Departing from the history of Princess Christin, that came in 1250 from Norway to Spain to marry the king Alphonse X, an original view is depicted of knowledge in general, as well as for some aspects of biology that are related with history. The first chapters contain reflections about time and try to show the importance that has, for biology, the...
Article
Departing from the history of Princess Christin, that came in 1250 from Norway to Spain to marry the king Alphonse X, an original view is depicted of knowledge in general, as well as for some aspects of biology that are related with history. The first chapters contain reflections about time and try to show the importance that has, for biology, the...
Article
Curvature of a plane curve is a measurement related to its shape. A Mathematica code was developed [Cervantes E, Tocino A. J Plant Physiol 2005;162:1038-1045] to obtain parametric equations from microscopic images of the Arabidopsis thaliana root apex. In addition, curvature values for these curves were given. It was shown that ethylene-insensitive...
Article
Full-text available
4 pages, 3 tables. Arabidopsis thaliana has reached maturity as a model system in plants. In this short text first, the meaning of the word model is discussed in relation to the ease with which developmental processes can be analyzed and also in relation to the influence that the model itself has on experimentation. Although the efficiency of Arabi...
Article
Full-text available
IN MATHEMATICS, CURVATURE IS AN IMPORTANT MAGNITUDE IN THE DESCRIPTION OF PLANE CURVES: it represents the rate of change of direction of a curve with respect to distance along the curve. By looking at root tips of Arabidopsis, we observed that their shape is altered in ethylene insensitive mutants. Here we describe the mathematical meaning of the c...
Article
The shape of Arabidopsis thaliana dry seed is described here as a prolate spheroid. The accuracy of this approximation is discussed. Considering its limitations, it allows a geometric approximation to the analysis of changes occurring in seed shape during imbibition prior to seed germination as well as the differences in shape between genotypes and...