3
views
0
recommends
+1 Recommend
1 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Transgenic maize pollen dispersal model in the municipality of Tierralta (Córdoba, Colombia) Translated title: Modelo de dispersión de polen de maíz transgénico en el municipio de Tierralta (Córdoba, Colombia)

      research-article

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          Abstract Transgenic crops appear as a response to the concern of supplying the high food demand produced by population growth. In this regard, different authors have argued that transgenics contaminate traditional crops genetically, causing the loss of native agricultural biodiversity. Although the significance of this work does not contemplate the affectation of traditional crops, the importance of this type of study and its possible use for subsequent research is explained. The aim of this work was to determine the average distance reached by transgenic maize pollen grains in 2016 in the municipality of Tierralta, Córdoba, using the Hysplit® program. The results show that with a concentration of 10-9 mg/m3, the annual average distance reached by maize pollen grains was 581 m, recording the highest average in May with a value of 799 m, and the minimum average in March with a value of 474 m. The analysis of results considered that, at the beginning of 2016, Colombia was undergoing the 'El Niño' phenomenon, causing the maize pollen grains to travel less compared to a neutral year or one subjected to the 'La Niña' phenomenon. This is due to the weak winds that occurred in the Colombian Caribbean region. By contrast, in the event of a neutral year or one with the 'La Niña' phenomenon, the particles could have traveled more as the wind strength would have been above normal.

          Translated abstract

          Resumen Los cultivos transgénicos aparecen como respuesta a la preocupación por abastecer la gran demanda alimenticia derivada del crecimiento poblacional. Sin embargo, diferentes autores han argumentado que los transgénicos contaminan genéticamente los cultivos tradicionales y ocasionan la pérdida de la biodiversidad agrícola nativa. Aunque este trabajo no aborda la afectación de los cultivos tradicionales, explica la importancia de este tipo de estudios y su posible uso para investigaciones posteriores. Esta investigación tuvo como objetivo determinar mediante el programa Hysplit® la distancia promedio que alcanzaron los granos de polen de maíz transgénico durante el año 2016 en el municipio de Tierralta, Córdoba. En los resultados, la concentración fue de 10-9 mg/m3 y el promedio anual de la distancia alcanzada por lo granos de polen de maíz fue de 500 m. El promedio máximo se registró en el mes de mayo con un valor de 799 m y el promedio mínimo se obtuvo en marzo con un valor de 474 m. Para el análisis de los resultados, se consideró que a comienzos del año 2016, el fenómeno de El Niño en Colombia generó que los granos de polen de maíz viajaran menos que durante un año neutro o un año con el fenómeno de La Niña, debido a los vientos débiles que se presentaron en el Caribe colombiano. En caso de haberse presentado un año neutro o con La Niña, las partículas habrían viajado más porque la fuerza de los vientos estaría por encima de lo normal.

          Related collections

          Most cited references45

          • Record: found
          • Abstract: found
          • Article: not found

          Long-distance pollen flow assessment through evaluation of pollinator foraging range suggests transgene escape distances.

          Foraging range, an important component of bee ecology, is of considerable interest for insect-pollinated plants because it determines the potential for outcrossing among individuals. However, long-distance pollen flow is difficult to assess, especially when the plant also relies on self-pollination. Pollen movement can be estimated indirectly through population genetic data, but complementary data on pollinator flight distances is necessary to validate such estimates. By using radio-tracking of cowpea pollinator return flights, we found that carpenter bees visiting cowpea flowers can forage up to 6 km from their nest. Foraging distances were found to be shorter than the maximum flight range, especially under adverse weather conditions or poor reward levels. From complete flight records in which bees visited wild and domesticated populations, we conclude that bees can mediate gene flow and, in some instances, allow transgene (genetically engineered material) escape over several kilometers. However, most between-flower flights occur within plant patches, while very few occur between plant patches.
            Bookmark
            • Record: found
            • Abstract: found
            • Article: not found

            Male reproductive development: gene expression profiling of maize anther and pollen ontogeny

            Background During flowering, central anther cells switch from mitosis to meiosis, ultimately forming pollen containing haploid sperm. Four rings of surrounding somatic cells differentiate to support first meiosis and later pollen dispersal. Synchronous development of many anthers per tassel and within each anther facilitates dissection of carefully staged maize anthers for transcriptome profiling. Results Global gene expression profiles of 7 stages representing 29 days of anther development are analyzed using a 44 K oligonucleotide array querying approximately 80% of maize protein-coding genes. Mature haploid pollen containing just two cell types expresses 10,000 transcripts. Anthers contain 5 major cell types and express >24,000 transcript types: each anther stage expresses approximately 10,000 constitutive and approximately 10,000 or more transcripts restricted to one or a few stages. The lowest complexity is present during meiosis. Large suites of stage-specific and co-expressed genes are identified through Gene Ontology and clustering analyses as functional classes for pre-meiotic, meiotic, and post-meiotic anther development. MADS box and zinc finger transcription factors with constitutive and stage-limited expression are identified. Conclusions We propose that the extensive gene expression of anther cells and pollen represents the key test of maize genome fitness, permitting strong selection against deleterious alleles in diploid anthers and haploid pollen. Because flowering plants show a substantial bias for male-sterile compared to female-sterile mutations, we propose that this fitness test is general. Because both somatic and germinal cells are transcriptionally quiescent during meiosis, we hypothesize that successful completion of meiosis is required to trigger maturation of anther somatic cells.
              Bookmark
              • Record: found
              • Abstract: not found
              • Article: not found

              Relationship between desiccation and viability of maize pollen

                Bookmark

                Author and article information

                Journal
                ccta
                Ciencia y Tecnología Agropecuaria
                Cienc. Tecnol. Agropecuaria
                Corporación Colombiana de Investigación Agropecuaria - Corpoica (Mosquera, Cundinamarca, Colombia )
                0122-8706
                2500-5308
                April 2021
                : 22
                : 1
                : e1637
                Affiliations
                [2] Bogotá orgnameUniversidad de los Andes Colombia
                [1] Bogotá orgnameUniversidad de los Andes Colombia c.mazo10@ 123456uniandes.edu.co
                Article
                S0122-87062021000100007 S0122-8706(21)02200100007
                10.21930/rcta.vol22_num1_art:1637
                0521ffec-0541-4a96-b004-ae8eeba6548e

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

                History
                : 06 August 2020
                : 01 September 2019
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 45, Pages: 0
                Product

                SciELO Colombia

                Categories
                Plant genetics and biodiversity

                simulation models,settling velocity,Hysplit®,deposition velocity,Zea mays,velocidad de sedimentación,velocidad de deposición,transgénicos,modelos de simulación,transgenics

                Comments

                Comment on this article