Examinando por Autor "Tuisima Coral, Lady Laura"

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Characterization of fruits of varieties of mango (Mangifera indica) conserved in Peru
(Sociedade Brasileira de Fruticultura, 2021-04-23) Tuisima Coral, Lady Laura; Escobar García, Héctor Alonso
The department of Piura is the main mango producer in Peru accounting for 66.7% of the national crop. The objective of the study was to characterize the fruits of forty varieties of mango preserved since 1969 in northwestern Peru. The fruits were harvested at the El Chira Agrarian Experimental Station, Department of Piura from December 2019 to January 2020. Thirteen quantitative fruit variables were evaluated: width, thickness, length, weight, seed width, seed thickness, seed length, percentage of seed, percentage of fresh skin, percentage of pulp, texture, °Brix, and pulp / seed ratios. The varieties with the highest percentage of pulp were Tommy Atkins, Haden x carabao 1, Irwin, and Jaffra, the latter was also the variety with the highest pulp / seed ratio (17.0). The varieties with the highest ° Brix were Blacman (21.3 ° Brix) and Julie (22.0 ° Brix). Knowledge of the fruit characteristics is essential for proper selection and use by the industry, especially those with a higher pulp weight to obtaining higher yields in processing.
Genetic variability of yam (Dioscorea trifida) genotypes in the Ucayali region, Peru
(Universidad Nacional de Colombia, 2022-04-30) Tuisima Coral, Lady Laura; Guillén Huachua, Wilfredo Felipe
The aim of this research was to assess genetic variability of yam Dioscorea trifida genotypes using morphological descriptors for the germplasm collection conserved in the Agricultural Experiment Station in Ucayali, Peru. Thirty-eight morphological traits were evaluated for 30 D. trifida genotypes over ten years; from the data we estimated the Shannon-Weaver diversity index (H’) and the coefficient of variation and performed principal component analysis and cluster analysis. Qualitative traits with high phenotypic diversity index were: petiole anthocyanin (0.86), internal tuber color (0.86), petiole color (0.81) and stem color (0.80). The quantitative traits with the highest coefficient of variation were: tuber weight per plant (33.01) and tuber yield (32.99). Seventy-six percent of the morphological variability is explained by four principal components, the first component is constituted by the characters tuber width, tuber weight per plant, and tuber yield (29%). Five groups of genotypes were also identified with statistically significant differences, where group B stands out for its higher yield in fewer days to harvest. This research reveals wide morphological diversity in genotypes of D. trifida; these results can be used to strengthen the conservation, management, and genetic improvement initiatives of this important species in the Peruvian Amazon.
Manual de manejo agronómico de raíces y tubérculos tropicales
(Instituto Nacional de Innovación Agraria, 2023-01) Odicio Guevara, Joel Esteban; Tuisima Coral, Lady Laura; Guillén Huachua, Wilfredo; Bonzano del Águila, Erick Hugo
El Instituto Nacional de Innovación Agraria (INIA) a través del Manual “Manejo agronómico de raíces y tubérculos tropicales” presenta los resultados obtenidos en el manejo agronómico del Banco de Germoplasma de Raíces y Tubérculos Tropicales, durante más de 20 años de conservación e investigación en estos importantes cultivos. Esta información relevante permitirá incrementar su producción, conservación, mejoramiento genético y valoración.
Manual técnico para la conservación y propagación de especies de algarrobo (Prosopis spp.)
(Instituto Nacional de Innovación Agraria, 2020-12) Carrillo Castillo, Fredesvinda; García Cochagne, Judith; Cabrera Pintado, Rosa María; Vásquez Oroya, Jhair; Tuisima Coral, Lady Laura; Escobar García, Héctor Alonso; Aguirre Gil, Oniel Jeremías; Quintana Palacios, Cristina; Amasifuen Guerra, Carlos Alberto
El Ministerio de Desarrollo Agrario y Riego (MIDAGRI) a través del Instituto Nacional de Innovación Agraria (INIA) tiene la misión de conservar los recursos genéticos de uso agrario, y fomentar su puesta en valor y producción. Por lo tanto, se vienen desarrollando investigaciones enfocadas en mitigar la disminución poblacional de algarrobo y de esta forma, contribuir en la recuperación de los ecosistemas de bosques secos del Perú. El presente manual proporciona información relevante sobre la propagación y conservación de las especies de algarrobo, se ha elaborado en base a literatura científica referida a las especies identificadas como P. pallida, P. chilensis, P. alba, P. laevigata, P. flexuosa, P. kuntzei, P. limensis, P. nigra, P. glandulosa, P. juliflora, P. tamarugo y P. spicigera. Asimismo, se ha tomado en cuenta información generada en los trabajos de conservación, micropropagación e identificación de plagas, que se han venido realizando en el INIA. En este manual se describen las características botánicas y agroecológicas del algarrobo, se proporciona información relevante respecto a las plagas asociadas a esta planta, y se describen las técnicas de selección, propagación y conservación de las semillas, que permite asegurar el mantenimiento de material vegetal representativo de su variabilidad genética, para su conservación.
Preliminary Evidence for Domestication Effects on the Genetic Diversity of Guazuma crinita in the Peruvian Amazon
(MPDI, 2020-07-23) Tuisima Coral, Lady Laura; Hlásná Čepková, Petra; Weber, John C.; Lojka, Bohdan
Guazuma crinita, a fast-growing timber tree species, was chosen for domestication in the Peruvian Amazon because it can be harvested at an early age and it contributes to the livelihood of local farmers. Although it is in an early stage of domestication, we do not know the impact of the domestication process on its genetic resources. Amplified fragment length polymorphic (AFLP) fingerprints were used to estimate the genetic diversity of G. crinita populations in different stages of domestication. Our objectives were (i) to estimate the level of genetic diversity in G. crinita using AFLP markers, (ii) to describe how the genetic diversity is distributed within and among populations and provenances, and (iii) to assess the genetic diversity in naturally regenerated, cultivated and semi-domesticated populations. We generated fingerprints for 58 leaf samples representing eight provenances and the three population types. We used seven selective primer combinations. A total of 171 fragments were amplified with 99.4% polymorphism at the species level. Nei’s genetic diversity and Shannon information index were slightly higher in the naturally regenerated population than in the cultivated and semi-domesticated populations (He = 0.10, 0.09 and 0.09; I = 0.19, 0.15 and 0.16, respectively). The analysis of molecular variation showed higher genetic diversity within rather than among provenances (84% and 4%, respectively). Cluster analysis (unweighted pair group method with arithmetic mean) and principal coordinate analysis did not show correspondence between genetic and geographic distance. There was significant genetic differentiation among population types (Fst = 0.12 at p < 0.001). The sample size was small, so the results are considered as preliminary, pending further research with larger sample sizes. Nevertheless, these results suggest that domestication has a slight but significant effect on the diversity levels of G. crinita and this should be considered when planning a domestication program.