Table 1 - uploaded by Andrea Lavalle
Content may be subject to copyright.
Agro-morphological characters. 

Agro-morphological characters. 

Source publication
Article
Full-text available
The establishment of relationships among taxa is an essential step in the process of cataloging and evaluation of material conserved in a germplasm bank. There are several evaluation methods according to the types of the characters in the study. When the registration of the characters should be repeated in diverse environments and times, it is nece...

Similar publications

Article
Full-text available
Purpose This study aims to present the successful implementation of the Koha-integrated library system (ILS) for libraries that seek an open-source alternative. This study is best suited for small libraries with limited collections and limited funding. The selection process between Koha and Evergreen is described, as is cataloging, patron setup an...
Article
Full-text available
Metadata librarian positions have been increasing in academic and research libraries in the last decade, paralleling the expanded provision of, and thus description of and access to, digital resources. Library literature has only begun to explore the significance and implications of this new, still evolving role. In the context of a twenty-first-ce...
Article
Full-text available
Princeton University Libraries have undergone several phases over the years regarding authority work. This paper focuses on Princeton's treatment of Hebrew name headings within the framework of authority work in general, prior to and following the library's involvement in the NACO (National Coordinated Cataloging Operations) project. The paper deal...

Citations

... The interpretation is intuitive, transferring this facility to the more complex methods. This method has been used in different fields, for example, to analyze sensory profiling data [12] and anatomical marker placement [13] as well as to model growth and age-and sex-related changes in the shape of the pediatric thoracic spine [14] and relationships between experts or panelists [15,16]. ...
Article
Full-text available
Governments serve a variety of purposes, and where governments spend their money has always been of concern to society. In particular, spending on public education is of great interest. However, the volume of this information can be difficult to manage. Therefore, the purpose of this work is to compare the COSTATIS method and generalized Procrustes analysis (GPA) when working with multi-way data. Despite the particular characteristics of each of them, they present similarities and differences that, when analyzed together, can provide complementary results to researchers. The COSTATIS consists of a co-inertia analysis of the compromise of two k-table analyses. The GPA method provides an optimal superimposed representation of individual configurations, and a common consensus configuration is constructed as the mean of all transformed configurations. In addition, the GPA method includes the translation, rotation and scaling of coordinates. In this study, both methods were applied, and the advantages and disadvantages of each are presented. The treated data are a sequence of tables from various countries where different public expenditures on education have been measured over time.
... In addition, the initial variables are usually correlated, whereas the new ones are not. This transformation facilitates data interpretation because it is possible to infer about linear relations between variables and similarities about individuals (5,27). In this study, a single PCA matrix of 54 accessions by 12 variables was performed using the mean value of accessions over replications per assay and subsequent concatenation of the assays. ...
... Some applications of this technique are related to measuringthe consensus between the agronomic and molecular information (1,3,10,18,20,22,26). On the other hand, GPA can be applied in crop characterization and other agronomic objectives (4,19,23,27). ...
Article
Full-text available
Characterization of plant material conserved in germplasm banks allows the study and analysis of the genetic variability within a collection. When germplasm banks have a large number of accessions, field evaluation should be performed using assays with manageable accession subsets. Common checks connecting the different assays are required to compare these accession subsets. In this study, the Generalized Procrustes Analysis was proposed as a basis for obtaining a factorial plane where all individuals are projected. This technique is applied to genotypes common to all assays, iteratively generating scale factors and rotation matrices. Accessions only belonging to a given assay are considered supplementary elements. This proposal was illustrated using datasets of 54 maize accessions from the Pergamino Active Germplasm Bank of the Experimental Station at the Instituto Nacional de Tecnología Agropecuaria (INTA) in Argentina. The proposal achieved highly satisfactory results. Highlights: In field evaluation of large germplasm collections, the material must be divided into manageable experimental trials, in which different accession subsets are evaluated in different environments. A new algorithm based on Generalized Procrustes Analysis (GPA) allowed to find the consensus of several configurations of individuals connected by common checks. The characterization data analysis strategy was illustrated using a set of accessions from the Argentine Maize Germplasm Bank. The new proposal stands as a useful tool for evaluate germplasm collections, providing good results with easy implementation and considering the multivariate structure of the data set.
... Análisis estadístico Para facilitar la interpretación de los datos se realizó una prueba de T de Student y se compararon las medias de las variables evaluadas en las dos formas de manejo del agroecosistema y para inferir sobre las relaciones de las variables se hizo un análisis factorial de componentes principales (AFCP), lo cual permitió la síntesis de la información y la disminución de la dimensión del número de variables (41 variables que incluyeron indicadores energéticos, económicos y uso del suelo) de acuerdo a lo planteado por the agroecosystem management; a factor analysis of main components (FAMC) was performed to infer on the relationships of the variables, allowing the synthesis of information and the decrease in size of the number of variables (41 variables that included energy, economic and land use indicators) according to what was stated by Zuliani (2012). From the FAMC, radial graphs were made based on the scores generated from the statisticians of the eight factors or components (new variables), which were expressed as a percentage for more understanding. ...
... Therefore, Cuadro 2. Equivalencia energética utilizada para calcular gastos en insumos directos e indirectos. Zuliani (2012). A partir del AFCP se realizaron gráficas radiales con base a los "scores" (puntuación) generados de los estadígrafos de los ocho factores o componentes (nuevas variables), los cuales fueron expresados en porcentaje para mayor comprensión. ...
Article
Full-text available
Given the need for scientific information to make better decisions to counteract pollution and environmental degradation, this research aimed to compare the maize-agroecosystem from an energy and economic perspective under two management practices: conservation and conventional in the Frailesca region of Chiapas, Mexico. Qualitative and quantitative variables were related through a factorial analysis of principal components. An interdisciplinary research methodology with socio-agronomic and economic approaches was used. Semistructured interviews were applied in 75 communities to 300 maize farmers who were grouped according to the type of practices implemented in the maize system: conventional or conservation agriculture. The variables analyzed for energy efficiency were: grain yield (t•ha⁻¹), consumed energy (MJ), produced energy (MJ•ha⁻¹), energy intensity and energy efficiency. Economic variables analyzed were net income, net outflow and income/cost ratio. Additionally, some land use variables were also analyzed. In the economic aspect, it was found that the main difference between both practices is the costs arising from soil preparation and stubble management which are higher for conventional maize management. In the energy aspect, conservation management differs from the conventional one by a more energy-use of efficiency expressed in the total energy required for production (5,854.55 MJ and 6,422.19 MJ, respectively). This efficiency comes mainly from the inputs used in the maize production process.
... Para la clasificación de dicha diversidad se han aplicado varios métodos estadísticos, entre los que destacan las técnicas multivariadas (1). Uno de los primeros trabajos que utiliza análisis multivariado para conocer la diversidad del maíz es el de Goodman (1967); también se ha utilizado el Análisis de Conglomerados y de Componentes Principales (5,6,13). ...
Article
Full-text available
En México, los agricultores conservan maíces nativos o criollos (Zea mays L.). En este estudio se caracterizó y clasificó la variabilidad morfológica de 71 colectas de maíces criollos del estado de Tabasco, México. Las colectas se sembraron en el ciclo primavera-verano 2011, en el Campo Agrícola Experimental de la Universidad Juárez Autónoma de Tabasco, bajo un diseño de bloques completos al azar con cuatro repeticiones. Se evaluaron 17 variables morfológicas de planta, mazorca, olote (marlo) y grano; se encontraron diferencias estadísticas en 14 de las 17 variables, el análisis de Componentes Principales (CP) determinó que los primeros tres CP explican el 92,3% de la variación, aportando la mayor variabilidad las variables peso de mazorca, peso de marlo y días a floración femenina. El análisis de conglomerados, detectó diversidad en las colectas, lo que permitió clasificarlas en cuatro grupos a 1,15 unidades de una distancia máxima de 1,40 unidades. Por sus características morfológicas el 85,9% de las colectas se relaciona con la raza Tuxpeño.
... Maize (Zea mays L.) is one of the most important crops worldwide and sustainable agricultural systems for this crop are urgently required (44,63). In the state of Oaxaca, Mexico, inappropriate soil management practices have led to the degradation and deterioration of the soils, and consequently, the yield of maize has decreased as a result of low soil fertility levels (23). ...
Article
Full-text available
The effect of Bokashi (B, a fermented compost), slow-release fertilizers (SRFs) and their combined application on mycorrhizal colonization (MC), soil invertase, cellulase, acid (AcP) and alkaline (AlP) phosphatases activities and maize (Zea mays L.) yield was investigated in terrace (TS) and valley (VS) soils in Oaxaca, Mexico. A complete randomized design, seven fertilizer treatments and four replications were used: unamended control (C); conventional fertilization (90-46-00 NPK) (CF); B; SRF1 (Multigro 6®, 21-14-10 NPK); SRF2 (Multigro 3®, 24-05-14 NPK); B+SRF1; B+SRF2. Highest root colonization percentage: CF in VS, and SRF2 in TS. Highest extraradical mycelium length: B, B+SRF1, CF in VS, and B+SRF1 in TS. In both soils, B increased the spore number. Highest AcP activity: B, SRF2 in VS, and B+SRF1, B+SRF2 in TS. Highest AlP activity: B+SRF1, CF in VS, and C in TS. Highest invertase activity: B+SRF1, SRF2, CF in VS, and B in TS. Grain yield only increased with B in VS. The significant interaction soil type × fertilizer treatment for the majority of the biological soil properties analyzed suggests that MC and soil enzyme activity response to fertilization was influenced by soil type. Bokashi, alone or combined with SRFs improves biological soil fertility in maize fields.
... Further, this mating system must produce stability in its genotypic array across the subsequent generations, which means that: 1) the farmers do not have to buy seed of the SV each cycle, except for the first one, and 2) the SV does not undergo inbreeding depression. Besides that these two advantages of a SV are not shown by hybrids, these varieties have been vulnerable to destructive diseases such as Helminthosporium maydis (11). Hybrids, however, show large heterotic effects. ...
Article
Full-text available
To reduce costs and labor associated with predicting the genotypic mean (GM) of a synthetic variety (SV) of maize (Zea mays L.), breeders can develop SVs from L lines and s single crosses (SynL,SC) instead of L+2s lines (SynL). The objective of this work was to derive and study formulae for the inbreeding coefficient (IC) and GM of SynL,SC, SynL, and the SV derived from (L+2s)/2 single crosses (SynSC). All SVs were derived from the same L+2s unrelated lines whose IC is FL, and each parent of a SV was represented by m plants. An a priori probability equation for the IC was used. Important results were: 1) the largest and smallest GMs correspond to SynL and SynL,SC, respectively; 2) the GM predictors with the largest and intermediate precision are those for SynL and SynL,SC, respectively; 3) only when FL=1, or m is large, SynL and SynSC are the same population, but only with SynSC prediction costs and labor undergo the maximum decrease, although its prediction precision is the lowest. To determine the SV to be developed, breeders should also consider the availability of lines, single crosses, manpower and land area; besides budget, target farmers, target environments, etc.
Article
Full-text available
El maíz amiláceo es considerado uno de los principales alimentos de los habitantes de la sierra peruana, en donde la mayor parte de la producción está destinada al autoconsumo, en diferentes formas. El objetivo principal de este estudio fue determinar la caracterización morfológica de 25 variedades de maíz amiláceo, evaluadas en 2 ambientes contrastantes de la provincia de Tayacaja, Huancavelica, Perú, en el ciclo del cultivo 2019-2020. La caracterización morfológica se efectuó utilizando 24 caracteres de planta y de mazorca, analizados mediante análisis de varianza univariado y multivariado. En el análisis multivariado se utilizó el método de componentes principales (CP) y el análisis de conglomerados por el método de Ward. Los estudios agronómicos permitieron demostrar la superioridad de las variedades mejoradas para la mayoría de los caracteres estudiados, lo cual refleja la importancia del mejoramiento genético de plantas en la obtención de genotipos con desempeño agronómico sobresalientes. De acuerdo al análisis de CP, los tres primeros CP explicaron 67 % de la variación fenotípica observada en el grupo de poblaciones estudiadas. La caracterización morfológica clasificó las variedades en seis grupos bien definidos, en función de los caracteres analizados. Todas las variables utilizadas en el estudio resultaron apropiadas para la clasificación y caracterización de la variabilidad fenotípica de materiales locales de maíz, excepto del rendimiento de grano, el índice de grano y el número de ramas secundarias en la espiga, para las cuales no se observó diferencias entre los grupos de variedades.