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      Epistasis para producción de granos y caracteres de la planta en una población de maíz tropical Translated title: Epistasis for grain yield and plant traits in a tropical maize population

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          Abstract

          En maíz, estudios sobre la importancia de la epistasis en la herencia de caracteres cuantitativos han mostrado resultados contradictorios; por lo tanto, es de gran relevancia determinar la influencia de los efectos epistáticos involucrados en la herencia de esos caracteres en el cultivo. En tal sentido, esta investigación fue desarrollada para (a) detectar la presencia de epistasis, (b) confirmar la importancia de la interacción epistasis por ambientes y (c) estimar los efectos epistáticos en plantas F2 para producción de granos y caracteres de la planta utilizando el diseño triple test cross en una población de maíz tropical formada a partir de dos líneas genéticamente divergentes. Cien progenies F2:3 retrocruzadas a ambas líneas parentales y a la F1 fueron evaluadas en once ambientes. La epistasis fue detectada para todos los caracteres, con excepción del acame total. Para producción de granos, altura de planta e intervalo entre florecimientos la epistasis del tipo aditiva x dominante y/o dominante x dominante fue más importante que la epistasis aditiva x aditiva; mientras, para altura de mazorca, posición relativa de la mazorca y floración masculina y femenina, ambos tipos de epistasis fueron importantes. La interacción epistasis con ambientes fue significativa para la floración femenina e intervalo entre florecimientos. Fueron identificados efectos epistáticos no-unidireccionales significativos en plantas F2 para todos los caracteres. Los resultados sugieren que, en la población estudiada, la epistasis constituye un componente importante de la varianza genética; por consiguiente, el modelo aditivo dominante no es suficiente para describir la variación genética de los caracteres estudiados.

          Translated abstract

          In maize, studies on the importance of epistasis in the inheritance of quantitative traits have shown contradictory results; therefore, is of great importance to determine the influence of epistatic effects involved in the inheritance of these characters in the crop. Thus, this research was conducted to (a) to verify the presence of epistasis, (b) to verify the importance of epistasis by environment interaction and (c) to estimate epistatic effects in plants F2 for grain yield and plant traits using the triple test cross design in a tropical maize population developed from two inbred lines genetically divergent. One hundred F2:3 progenies backcrossed to both parental lines and F1 were evaluated in eleven environments. Epistasis was detected for all traits, except for root and stalk lodging. For grain yield, plant height and anthesis-silking interval the additive x dominance and/or dominance x dominance epistasis were more important than additive x additive epistasis; however, for ear height, ear placement, days to anthesis and days to silk emergence, both types of epistasis were important. Epistasis by environment interaction was significant for days to silk emergence and anthesis-silking interval. Significant epistatic non-unidirectional effects were identified in F2 plants for all traits. The results suggest that, in the studied population, epistasis is an important component of genetic variance; therefore, the dominant additive model is not sufficient to describe the genetic variation of the studied traits.

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          Most cited references40

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          An approximate distribution of estimates of variance components.

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            Breeding for quantitative traits in plants

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              Genetic analysis and major QTL detection for maize kernel size and weight in multi-environments.

              Twelve major QTL in five optimal clusters and several epistatic QTL are identified for maize kernel size and weight, some with pleiotropic will be promising for fine-mapping and yield improvement. Kernel size and weight are important target traits in maize (Zea mays L.) breeding programs. Here, we report a set of quantitative trait loci (QTL) scattered through the genome and significantly controlled the performance of four kernel traits including length, width, thickness and weight. From the cross V671 (large kernel) × Mc (small kernel), 270 derived F2:3 families were used to identify QTL of maize kernel-size traits and kernel weight in five environments, using composite interval mapping (CIM) for single-environment analysis along with mixed linear model-based CIM for joint analysis. These two mapping strategies identified 55 and 28 QTL, respectively. Among them, 6 of 23 coincident were detected as interacting with environment. Single-environment analysis showed that 8 genetic regions on chromosomes 1, 2, 4, 5 and 9 clustered more than 60 % of the identified QTL. Twelve stable major QTLs accounting for over 10 % of phenotypic variation were included in five optimal clusters on the genetic region of bins 1.02-1.03, 1.04-1.06, 2.05-2.07, 4.07-4.08 and 9.03-9.04; the addition and partial dominance effects of significant QTL play an important role in controlling the development of maize kernel. These putative QTL may have great promising for further fine-mapping with more markers, and genetic improvement of maize kernel size and weight through marker-assisted breeding.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                ba
                Bioagro
                Bioagro
                Decanato de Agronomía de la Universidad Centroccidental "Lisandro Alvarado" (UCLA) (Barquisimeto, Edo. Lara, Venezuela )
                1316-3361
                August 2017
                : 29
                : 2
                : 83-94
                Affiliations
                [04] Piracicaba São Paulo orgnameUniversidad  de  São  Paulo orgdiv1Escuela Superior de Agricultura Luiz de Queiroz Brasil
                [01] Valle de la Pascua Guárico orgnameInstituto Nacional de Investigaciones Agrícolas Venezuela
                [02] Araure Portuguesa orgnameInstituto Nacional de Investigaciones Agrícolas Venezuela
                [03] Uberlândia Minas Gerais orgnameSyngenta Semillas Ltda Brasil
                Article
                S1316-33612017000200002
                9efc7375-3fab-4342-91f1-d632132f25d3

                http://creativecommons.org/licenses/by/4.0/

                History
                : 25 March 2016
                : 15 December 2016
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 40, Pages: 12
                Product

                SciELO Venezuela


                Caracteres cuantitativos,interacciones no alélicas,triple test cross,Zea mays,Non allelic interactions,quantitative traits

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