Person: Narro, L.A.
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Narro
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L.A.
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Narro, L.A.
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- Efeitos genicos e oscilacao genetica associados a selecao recorrente intrapopulacional na populacao de milho SA3(Embrapa Secretaria de Pesquisa e Desenvolvimento, 2000) Caviedes Cepeda, G.M.; Lopes, A.S; Narro, L.A.; Pandey, S.
Publication - Conservation and use of Latin American maize diversity: pillar of nutrition security and cultural heritage of humanity(MDPI, 2021) Guzzon, F.; Arandia Rios, L.W.; Caviedes Cepeda, G.M.; Céspedes Polo, M.; Chávez-Cabrera, A.; Muriel Figueroa, J.; Medina Hoyos, A.E.; Jara Calvo, T.W.; Molnar, T.L.; Narro, L.A.; Narro León, T.P.; Mejía, S.; Ospina Rojas, J.G.; Vasquez-Carrillo, G.; Preciado-Ortiz, R.E.; Zambrano, J.L.; Palacios-Rojas, N.; Pixley, K.V.
Publication - Maize for Colombia 2030 Vision(CIMMYT, 2019) Galeano, C.; Nutti, M.; Vanegas, H.; Pasculli, L.; Peña, Y.; Aguilar, D.; Govaerts, B.; Vega, D.; Chávez, X.; Narro, L.A.; San Vicente Garcia, F.M.; Palacios-Rojas, N.; Pérez, M.; González, G.; Ortega, P.; Carvajal, A.; Arcos, A.L.; Bolaños, J.; Romero, N.; Bolaños, J.; Vanegas, Y.F.; Echeverria, R.G.; Jarvis, A.; Jiménez, D.; Ramirez-Villegas, J.; Kropff, W.; Gonzalez, C.; Navarro-Racines, C.E.; Ordóñez, L.; Prager, S.D.; Tapasco, J.; Figueroa, E.; Aguilar, A.; Galeano, C.; Nutti, M.; Ramírez-Villegas, J.; Vanegas, H.; Pasculli, L.; Peña, Y.; Aguilar, D.In Colombia, maize is the third crop with the largest cultivation area after coffee and rice. In spite of this, it is the country with the highest volume of imports in South America, and the seventh in the world. Maize is one of the most important crops in the agrifood sector in Colombia. Maize production increased 76% between 1961 and 2016, whereas the demand for it grew at a faster rate. In 2012, a historical production peak of 1.8 Mt (million tonnes) was reached. According to the most recent data, production fell to 1.6 Mt (2016). In the same year, 74% of the national demand was imported, that is, 4.6 Mt of the 6.2 Mt required in the country. If this trend continues, production is expected to grow by around 6% and demand by 9% between 2018 and 2030. Maize has an important social dimension in the diet of millions of Colombians, providing 9% of the daily energy supply of their diet through the consumption of foods such as arepas and mazamorra, among others. On average, a Colombian consumes 30 kg of maize a year. However, the growing demand for this grain responds, to a greater extent, to the consumption of animal protein, which requires maize for animal feed. Therefore, this demand is explained by the significant increase in the consumption of animal products, which has soared dramatically in recent years. Consumption patterns in the diet of Colombians respond to changes in income—hence in their consumption habits— as well as to the spending on animal products among the global population. In turn, production is also part of an important social and economic dimension. Two systems of maize production co-exist in the country: technified and traditional. The technified maize production system is characterized by monocultures of more than 5 hectares (ha) with water availability for irrigation in some cases, and the use of technologies based on mechanization for soil preparation, use of improved seeds, fertilizers, and chemical pesticides. In Colombia, this system represents 48% of the area destined for maize, with a production of 1.2 Mt7 and an average yield of 5.4 t/ha (tonnes per hectare), given its main characteristics of cultivation. In turn, the traditional production system is characterized by planting areas smaller than 5 ha, where the crop is based on the use of a wide diversity of native varieties without the use of hybrids due to the economic difficulties to access them. Also, the technologies for sowing are based on the plough with hoe and dibble bar. In this sense, in spite of having 52% of the area destined for maize production, less is produced than under the technified system, reaching a production of 0.5 Mt, and an average yield of only 2 t/ha
Publication - Maíz para Colombia Visión 2030(CIMMYT, 2019) Govaerts, B.; Vega, D.; Chávez, X.; Narro, L.A.; San Vicente Garcia, F.M.; Palacios-Rojas, N.; Pérez, M.; González, G.; Ortega, P.; Carvajal, A.; Arcos, A.L.; Bolaños, J.; Romero, N.; Bolaños, J.; Vanegas, Y.F.; Echeverria, R.G.; Jarvis, A.; Jiménez, D.; Ramirez-Villegas, J.; Kropff, W.; Gonzalez, C.; Navarro-Racines, C.E.; Ordóñez, L.; Prager, S.D.; Tapasco, J.; Figueroa, E.; Aguilar, A.; Galeano, C.; Nutti, M.; Ramírez-Villegas, J.; Vanegas, H.; Pasculli, L.; Peña, Y.; Aguilar, D.
Publication - Nuevos cultivares de maíz con calidad nutricional para los trópicos bajos de América Latina(CIMMYT, 2018) San Vicente Garcia, F.M.; Gordon Mendoza, R.; Deras, H.; Cruz, O.; Gomez, M.R.; Martinez, H.; Bowen, C.; Fuentes, M.; Brenes, G.; Pineda, A.; Espinoza, A.; Palacios-Rojas, N.; Mejía, S.; Narro, L.A.; Arcos, A.L.
Publication - Lineamientos para el control de calidad de semilla y grano de maíz de alta calidad proteica (QPM): experiencia en el desarrollo y promoción de QPM en Latinoamérica(CIMMYT, 2017) Palacios-Rojas, N.; Twumasi Afriyie, S.; Friesen, D.; Chere, A.T.; Dagne Wegary Gissa; De Groote, H.; Rosales Nolasco, Aldo; Narro, L.A.; Chassaigne, A.A.; Padilla, R.; Vargas-Escobar, E.A.; López, K.; Bowen, C.; Prasanna, B.M.Este manual está compuesto de dos partes, una traducción del manual en ingles elaborado por el CIMMYT en 2016 y una serie de experiencias en Latinoamérica en el desarrollo y promoción del maíz de alta calidad proteica (QPM, siglas en inglés de Quality Protein Maize). El manual proporciona recomendaciones y ofrece una base para monitorear la calidad de los QPM. Los lineamientos se basan en la genética, el mejoramiento, las características y los beneficios nutricionales del QPM. El manual también incluye una lista de variedades QPM basadas en germoplasma del CIMMYT que han sido liberadas mundialmente. Asimismo, explica los conceptos de control de calidad, producción y sistemas de certificación de semilla; la definición de la calidad proteica y los métodos para analizar la calidad proteica del QPM; los procedimientos de muestreo para enviar muestras al laboratorio para que sean analizadas; y cómo encontrar un laboratorio de análisis de calidad. Incluye también recomendaciones para controlar la calidad tanto del grano como de la semilla reciclada de QPM. El objetivo de este boletín técnico es que sirva como documento de referencia para establecer estándares nacionales para el control de la calidad de la semilla y el grano en los países donde se produce y comercializa el QPM.
Publication - Genome-wide association mapping reveals novel sources of resistance to northern corn leaf blight in maize(BioMed Central, 2015) Junqiang Ding; Farhan Ali; Gengshen Chen; Huihui Li; Mahuku, G.; Ning Yang; Narro, L.A.; Magorokosho, C.; Makumbi, D.; Jianbing YanBackground: Northern corn leaf blight (NCLB) caused by Exserohilum turcicum is a destructive disease in maize. Using host resistance to minimize the detrimental effects of NCLB on maize productivity is the most cost-effective and appealing disease management strategy. However, this requires the identification and use of stable resistance genes that are effective across different environments. Results: We evaluated a diverse maize population comprised of 999 inbred lines across different environments for resistance to NCLB. To identify genomic regions associated with NCLB resistance in maize, a genome-wide association analysis was conducted using 56,110 single-nucleotide polymorphism markers. Single-marker and haplotype-based associations, as well as Anderson-Darling tests, identified alleles significantly associated with NCLB resistance. The single-marker and haplotype-based association mappings identified twelve and ten loci (genes), respectively, that were significantly associated with resistance to NCLB. Additionally, by dividing the population into three subgroups and performing Anderson-Darling tests, eighty one genes were detected, and twelve of them were related to plant defense. Identical defense genes were identified using the three analyses. Conclusion: An association panel including 999 diverse lines was evaluated for resistance to NCLB in multiple environments, and a large number of resistant lines were identified and can be used as reliable resistance resource in maize breeding program. Genome-wide association study reveals that NCLB resistance is a complex trait which is under the control of many minor genes with relatively low effects. Pyramiding these genes in the same background is likely to result in stable resistance to NCLB.
Publication - Heterosis in acid soil-tolerant maize germplasm(CIMMYT, [1997?].) Narro, L.A.; Pandey, S.; De Leon, C.; Pérez, J.C.; Salazar Villarreal, F.A.; Arias, M.P.; Celis, J.; Reyes, S.; Mejía, S.
Publication - Comparison of the performance of synthetic maize varieties created based on either genetic distance or general combining ability of the parents(Consiglio per la Ricerca e la sperimentazione in Agricoltura, Unità di Ricerca per la Maiscoltura, 2012) Narro, L.A.; Franco, J.; George, M.L.C.; Arcos, A.L.; Osorio, K.V.; Warburton, M.Synthetics varieties are grown by farmers and used by breeders to select new inbred lines. In countries unable to market hybrids, use of synthetics leads to yield improvements over landraces. Synthetics are derived from intercrossing inbred lines known to possess high general combining ability (GCA) as measured via crossing with testers and phenotyping for yield in multiple environments. Genetic similarity (GS) between lines measured by molecular markers may efficiently estimate GCA. Although the prediction of specific combining ability (SCA) of lines via GS has not been successful, it may have potential to predict the suitability of lines to form a synthetic variety. As this has not been reported, the objective of this research was to compare the performance of four synthetic maize varieties developed using GS calculated between parents using SSR markers with the performance of synthetics developed using GCA based on yield. Synthetics were phenotyped for yield and other agronomic traits in replicated field trials in several environments. The two synthetics formed based on low GS (0.34 and 0.33) performed better than all other synthetics in yield and most agronomic traits. The synthetics formed based on high GS (0.77 and 0.53), performed worst for nearly all traits. The GCA-based synthetics were generally intermediate for all traits. Response of synthetics to environmental variation and efficiencies gained via use of molecular markers in synthetic formation is discussed.
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