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      Finite (Hausdorff) dimension of plants and roots as indicator of ontogeny Translated title: Dimensión finita (de Hausdorff) de plantas y raíces como indicador de ontogenia

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          Abstract

          The architecture of plants responds to endogenous processes and to the influence of environmental factors. The allometric study of architecture has been a challenge for biology. We define a new finite (Hausdorff) dimension of plants, that considers both the aerial part and the roots, and compute examples. This new finite dimension was introduced recently and, in contrast to the classical Hausdorff dimension, is not zero on finite sets. We propose the finite dimension, as a function of time, as a "signature" of the plant or root. Our first results suggest that the signature is specific to each plant species and its growth period, and constitutes an objective metric that allows to study its ontogenesis in detail.

          Translated abstract

          La arquitectura de las plantas responde a procesos endógenos y a la influencia de factores ambientales. El estudio alométrico de la arquitectura ha sido un desafío para los biólogos. En este trabajo definimos una nueva dimensión finita (de Hausdorff) de plantas, considerando su parte aérea y de raíces y calculamos algunos ejemplos. Esta nueva dimensión finita fue introducida recientemente y, a diferencia de la dimensión clásica de Hausdorff, no es cero en conjuntos finitos. Proponemos que la dimensión finita, como función del tiempo, es una "firma" de la planta o raíz. Nuestros primeros resultados sugieren que la firma es específica para cada especie de planta y su período de crecimiento, y constituye una métrica objetiva que permite estudiar detalladamente la ontogénesis.

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          Body size and metabolism

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            A general model for the structure and allometry of plant vascular systems

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              A unifying explanation for diverse metabolic scaling in animals and plants.

              The scaling of metabolic rate with body mass has long been a controversial topic. Some workers have claimed that the slope of log-log metabolic scaling relationships typically obeys a universal 3/4-power law resulting from the geometry of resource-transport networks. Others have attempted to explain the broad diversity of metabolic scaling relationships. Although several potentially useful models have been proposed, at present none successfully predicts the entire range of scaling relationships seen among both physiological states and taxonomic groups of animals and plants. Here I argue that our understanding may be aided by three shifts in focus: from explaining average tendencies to explaining variation between extreme boundary limits, from explaining the slope and elevation (metabolic level) of scaling relationships separately to showing how and why they are interrelated, and from focusing primarily on internal factors (e.g. body design) to a more balanced consideration of both internal and external (ecological) factors. By incorporating all of these shifts in focus, the recently proposed metabolic-level boundaries hypothesis appears to provide a useful way of explaining both taxonomic and physiological variation in metabolic scaling relationships. This hypothesis correctly predicts that the scaling slope should vary mostly between 2/3 and 1 and that it should be related to metabolic (activity) level according to an approximately U-shaped function. It also implies that the scaling of other energy-dependent biological processes should be related to the metabolic level of the organisms being examined. Some data are presented that support this implication, but further research is needed.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                refca
                Revista de la Facultad de Ciencias Agrarias. Universidad Nacional de Cuyo
                Rev. Fac. Cienc. Agrar., Univ. Nac. Cuyo
                Revista de la Facultad de Ciencias Agrarias. Universidad Nacional de Cuyo (Mendoza, , Argentina )
                1853-8665
                1853-8665
                December 2019
                : 51
                : 2
                : 142-153
                Affiliations
                [02] Mendoza orgnameUniversidad Nacional de Cuyo orgdiv1Facultad de Ciencias Exactas y Naturales FCEN Argentina
                [04] Chacras de Coria Mendoza orgnameUniversidad Nacional de Cuyo orgdiv1Facultad de Ciencias Agrarias Argentina
                [01] San Luis orgnameUniversidad Nacional de San Luis Argentina
                [03] Mendoza orgnameConsejo Nacional de Investigaciones Científicas y Técnicas orgdiv1Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales IANIGLA Argentina
                Article
                S1853-86652019000200011 S1853-8665(19)05100200011
                aae7429c-54aa-4826-9711-d0fb745b0b0f

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

                History
                : 13 June 2019
                : 12 April 2018
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 31, Pages: 12
                Product

                SciELO Argentina

                Categories
                Original Articles

                Desarrollo de plantas,Finite (Hausdorff) dimension,Plant architecture,Plant development,Dimensión fractal,Dimensión finita (de Hausdorff),Arquitectura de plantas,Fractal dimension

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