Person: Rincón-Sánchez, F.
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Rincón-Sánchez
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F.
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Rincón-Sánchez, F.
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0000-0003-1457-0605 5 results
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- Morphological characterization of native maize populations of the ratón race from Coahuila, Mexico(Colegio de Postgraduados, 2023) Olvera-Aguilar, D.M.; Rincón-Sánchez, F.; Ruiz-Torres, N.A.; Martínez-Reyna, J.M.; Petroli, C.
Publication - Caracterización de accesiones de maíz por calidad de grano y tortilla(Sociedad Mexicana de Fitogenética, 2004) Mauricio Sánchez., R.A.; Figueroa, J. de D.; Taba, S.; Reyes Vega, M.; Rincón-Sánchez, F.; Mendoza Galván, A.
Publication - Exploiting modified single crosses in maize (Zea mays L.) to facilitate hybrid use in developing countries(Consiglio per la Ricerca e la sperimentazione in Agricoltura, Unità di Ricerca per la Maiscoltura, 2009) Sahagun, J.; Cordova, H.S.; Srinivasan, G.; Queme, J.L.; Rincón-Sánchez, F.; Preciado-Ortiz, R.E.; Alvarado Beltrán, G.; Lopez, R.A three-phase study was led by CIMMYT during 1996-99 to assess the usefulness of modified single-cross hybrids to accelerate the adoption of maize hybrids by farmers in developing countries. During Phase I, we evaluated and selected elite, conventional, single-cross hybrids. Based on the information from Phase I, different versions of related crosses between sister lines used in the elite single crosses identified in Phase I were formed and tested during Phase II. Finally, in Phase III we used the results of Phase II to form different versions of modified single crosses and tested them with the original conventional single crosses. From Phase I, 13 conventional single-cross hybrids selected averaged 11.2 t ha-1 and the best three averaged 11.9 t ha-1, outyielding the best check, A-7545 (11.5 t ha-1). From Phase II, the 18 related crosses averaged 6.7 t ha-1, while the 25 lines per se involved in these crosses yielded 4.5 t ha-1, an average difference of 50%. The related crosses selected expressed a 37% high parent heterosis on average. Finally, in Phase III we found non-significant differences in yield between the original conventional single crosses and the corresponding modified single crosses (both averaged 9.6 t ha-1). These results confirm that modified single crosses can produce grain yields comparable to their corresponding conventional crosses. Thus, modified single-cross hybrids represent a possible option for exploiting the high yield performance of elite conventional single crosses, where this type of cultivars cannot be adopted by resource-poor farmers in developing countries because expensive price of certified seed.
Publication - Evaluation of Zapalote Chico accessions for conservation and enhancement(Consiglio per la Ricerca e la sperimentazione in Agricoltura, Unità di Ricerca per la Maiscoltura, 2006) Taba, S.; Diaz, J.; Aragon Cuevas, F.; Rincón-Sánchez, F.; Hernandez, J.M.; Krakowsky, M.Conserving traditional maize (Zea mays L.) landraces grown by farmers in Latin America can con- tribute to food security. Core subsets of such landraces that represents that diversity can be used for their en- hancement. One such enhancement effort was conducted on a total of 81 accessions drawn from the CIMMYT maize collection of the race Zapalote Chico and newer accessions collected in 1999 from Istmo de Tehuantepec, Oaxaca, Mexico, where the race Zapalote Chico is pre- dominantly grown. These accessions were evaluated at four locations in the Mexican states of Morelos, Guerrero, and Oaxaca for agronomic and morphological traits to as- sess the intraracial diversity for conservation and en- hancement. Eleven agronomic and morphological traits were measured and used for a multivariate cluster analy- sis. The cluster analysis produced four non-overlapping clusters with 63 accessions, indicating the intraracial di- versity of the Zapalote Chico. The analysis also formed two other clusters with four races, including Tepecintle and Olotillo, which have been introduced to the region of Istmo de Tehuantepec. Using a selection index that ac- counts for grain yield, grain quality, and standability, and an agronomic performance rating, a breeder core subset (the best 20%) was chosen to represent phenotypic diver- sity among the clusters. In the core subset, fifteen acces- sions comprise the core subset of the race Zapalote Chico and three accessions comprise the core subset for the other races. These core subset accessions, which repre- sent the diversity of the regional landraces of maize, can be enhanced through introgression of improved lines or populations for yield potential, drought resistance, and ear rot resistance, while maintaining the desirable grain quality traits of the original races.
Publication - Cluster analysis, an approach to sampling variability in maize accessions(Consiglio per la Ricerca e la sperimentazione in Agricoltura, Unità di Ricerca per la Maiscoltura, 1996) Rincón-Sánchez, F.; Johnson, B.; Crossa, J.; Taba, S.Cluster analysis is frequently used to classify maize (Zen mays L.) accessions and can be used by breeders and geneticists to identify subsets of accessions which have potential utility for specific breeding or genetic purposes. Phenograms can be utilized to define subsets of accessions on the basis of dissimilarity coefficients. Phenograms created using cluster analysis depend on the clustering method, and on type and number of attributes used to compute associations among individuals. The objectives of this study were to 1) compare several clustering strategies used for grouping Caribbean maize accessions, 2) define groups having similar characteristics, and 3) obtain a representative subset of the total number of accessions evaluated. Four hierarchical clustering strategies were compared: single linkage, unweighted pair-group method using arithmetic averages (UPGMA), using centroids, and Ward's. Each method was evaluated using two data sets, and varying types and numbers of traits. Average euclidean squared distance was used as the dissimilarity measure. Phenogram agreement was evaluated by the cophenetic correlation coefficients. Cophenetic correlation and inspection of phenograms suggested that in preference to the other strategies, UPGMA can be utilized to group maize accessions using agronomic and morphological data. Number of individuals and number of traits affected computation of dissimilarity measures among accessions. For large data sets, it might be useful to include as many traits as possible to compute the dissimilarity measures. In addition to clustering methods, principal component analysis helped to form groups which had particular characteristics that accounted for phenotypic diversity present in the whole population. Groups were formed on basis of common clusters identified by a consensus analysis. Each group was exposed to a stratified sampling process to define a subset in proportion to their number of accessions. A set of 43 entries (23%) was identified as a selected subset representing the 184 accessions evaluated. The relationships among accessions defined by the phenogram, and the associated race classification indicated that phenetic relationship can be used to group maize accessions, and consequently definine subsets, in proportion to the number of accessions
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