Estimates of genetic parameter in maize commercial variety IPR 114 at Paraná State, Brazil

Rovaris, Sara Regina Silvestrin; Araújo, Pedro Mário de; Garbuglio, Deoclécio Domingos; Prete, Cássio Egídio Cavenaghi; Zago, Valquíria Sheila; Silva, Lucas José Ferreira da

doi:10.4025/actasciagron.v33i4.8367

Cited by 8 publications

(17 citation statements)

References 7 publications

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“…So for the traits considered, both as agronomic as morphological, except for PH, it was possible to detect genetic variation potential for selection ( Table 2). The CVg for PH and EH, of 4.65% and 7.64%, respectively, although low regarding the other traits, are in agreement with the values obtained by Rovaris et al (2011), of 3.02% and 4.40%. The magnitudes of CVg found for the morphological traits RFM, RDM and SDM are similar to those reported by Mehdi and Ahsan (2000), which reinforces the potential of these traits for selection.…”

Section: Resultssupporting

confidence: 79%

Correlation and path analysis of agronomic and morphological traits in maize

Silva

Môro

Alves

et al. 2016

Revista Ciência Agronômica

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-The efficiency of selection can be broadened for certain traits using estimative of genetic parameters, which are fundamental for plant breeding. The estimative of genetic parameters allows identifying the nature of the action of genes involved in the control of quantitative traits and evaluates the efficiency of different breeding strategies to obtain genetic gains. Therefore, this study aimed to verify the variability and correlation between morphological and agronomic traits in synthetic maize populations, in order to practice indirect selection. Thirteen populations were evaluated in field experiments at Jaboticabal-SP and Campo Alegre de Goiás-GO, using randomized block design, for lodging (LOD), culm breakage (CB), plant height (PH), ear height (EH) and grain yield (GY). The 13 populations were also sown in 1 kg-plastic bags under black shade cloth, using a randomized complete block design with nine replications, for evaluation of the morphological traits: main root length (MRL), root fresh matter (RFM), root dry matter (RDM), average root diameter (ARD), root surface area (RSA), root tissue density (RTD) and shoots dry matter (SDM). The trait GY exhibited genetic variability enough to be effective if used for selection. The selection on the morphological traits is indicated on RDM, due to the ease in obtaining data and its accuracy, high correlation with all morphological traits and association with GY. The simultaneous selection based on RFM and RDM, for gains in GY, can be performed. The highest direct effect on GY was identified in LOD and CB, being indicated for indirect selection.Key words: Zea mays. Phenotypic correlation. Genetic parameters. Direct selection.RESUMO -A eficiência de seleção pode ser ampliada para determinado caráter utilizando-se estimativas de parâmetros genéticos, as quais são fundamentais no melhoramento de plantas, uma vez que permitem identificar a natureza da ação dos genes envolvidos no controle de caracteres quantitativos e avaliar a eficiência de diferentes estratégias de melhoramento para a obtenção de ganhos genéticos. Assim, objetivou-se verificar a existência de variabilidade e correlação entre caracteres agronômicos e morfológicos em populações sintéticas de milho, visando seleção indireta. Foram utilizadas 13 populações, avaliadas em experimentos de campo em Jaboticabal-SP e Campo Alegre de Goiás-GO, utilizando-se o delineamento em blocos casualizados, para acamamento (AC), quebramento de colmos (QUE), altura de plantas (AP), altura de espiga (AE), e produção de grãos (PG). As 13 populações também foram semeadas em sacos plásticos de 1 kg sob sombrite, utilizando-se delineamento em blocos casualizados com nove repetições, para avaliação das seguintes características morfológicas: comprimento da raiz principal (CR), matéria fresca de raiz (MFR), matéria seca de raiz (MSR), diâmetro médio de raiz (DMR), área de superfície da raiz (ASR), densidade de tecido radicular (DTR) e matéria seca da parte aérea (MSPA). O caráter PG apresentou grande variabilidade genéti...

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Section: Resultssupporting

confidence: 79%

Correlation and path analysis of agronomic and morphological traits in maize

Silva

Môro

Alves

et al. 2016

Revista Ciência Agronômica

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“…Epistasis as an important genetic basis of complex phenotypes has also been revealed in several recent QTL mapping studies Yu et al 1997;Ma et al 2005;Liu et al 2011;Rahman et al 2011;Borràs-Gelonch et al 2012;Krajewski et al 2012). However, marker-based analyses for estimation of QTL effects usually assume the absence of epistasis among QTLs (Lander and Botstein 1989;Jansen 1993;Zeng 1994;Bocianowski and Krajewski 2009;Rovaris et al 2011). This assumption was made largely for simplification of the statistical models.…”

Section: Introductionmentioning

confidence: 99%

Estimation of epistasis in doubled haploid barley populations considering interactions between all possible marker pairs

Bocianowski

2013

Euphytica

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Epistasis, is the interaction between alleles from two or more loci determining complex traits, and thus plays an important role in the development of quantitative traits of crops. In mapping studies of inbreeding species epistasis is usually defined as the interactions between quantitative trait loci with significant additive gene effects. Indeed, in many studies, genes with small effects do not come into the final model and thus the total epistasis interaction effect is biased. Many loci may not have a significant direct effect on the trait under consideration, but they may still affect trait expression by interacting with other loci. In this paper the benefits of using all loci, not only the loci with significant main effects, for estimation of the epistatic effects are presented. The particular examples are with doubled haploids lines and so are restricted to homozygotes and thus additive genetic effects and additive 9 additive interactions. Numerical analyses were carried out on three populations of doubled haploid lines of barley (Hordeum vulgare L.): 120 doubled haploid lines from the Clipper 9 Sahara 3771 cross, 145 doubled haploid lines from the Harrington 9 TR306 cross and 150 doubled haploid lines from the Steptoe 9 Morex cross. In total, 157 sets of observations were analyzed and altogether 728 pairs of loci were observed for the three datasets.

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“…En la formación de variedades de polinización libre se utilizan esquemas de mejoramiento intrapoblacional por medio de la selección recurrente, donde el principal objetivo es incrementar la frecuencia de alelos favorables en la población (Hallauer, 1981). El conocimiento de la magnitud de los parámetros genéticos de la población base de selección, permite diseñar la mejor estrategia a seguir en programas de mejoramiento genético (Rovaris et al, 2011).…”

Section: Introductionunclassified

Estimación de parámetros genéticos y selección de líneas S1 en una población segregante de maíz tropical

Hernández

Gutiérrez

Ruiz

et al. 2017

Remexca

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En México se cultivan 7.5 millones de hectáreas con maíz, con un rendimiento de grano promedio de 3.2 t ha-1, una estrategia para incrementar el rendimiento es el uso de variedades mejoradas. Los objetivos del presente estudio fueron: 1) estimar los parámetros genéticos en una población segregante de maíz tropical; 2) seleccionar líneas S1 con base en el rendimiento de grano y precocidad; y 3) determinar la correlación fenotípica y genética entre caracteres. El germoplasma de estudio fueron 193 líneas S1 segregantes, los progenitores y un testigo, las líneas S1 provienen de la población F2 de la cruza de Ac7643 x B-39. Las líneas se evaluaron bajo riego usando un diseño látice alfa con dos repeticiones, en los ciclos primavera-verano 2013 y otoño-invierno 2013/2014, en Ayala, Morelos. Las variables registradas fueron días a floración masculina (FM) y femenina (FF), sincronía floral (SF), altura de planta (AP) y mazorca (AM), y rendimiento de grano (RG). Los resultados indican que el coeficiente de variación genético aditivo para RG fue de 17% y en FM de 4%; la heredabilidad para los mismos caracteres resultó de 0.42 y 0.80, respectivamente. La ganancia genética esperada para RG fue de 0.143 t ha-1 y para FM de -0.62 d. La línea LUM-80 resultó con herencia transgresiva positiva en RG. Las correlaciones fenotípicas y genéticas entre RG y el resto de caracteres fueron bajas. El alto grado de variabilidad genética presente en la población segregante permite continuar con el programa de mejoramiento genético.

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Estimates of genetic parameter in maize commercial variety IPR 114 at Paraná State, Brazil

Cited by 8 publications

References 7 publications

Correlation and path analysis of agronomic and morphological traits in maize

Correlation and path analysis of agronomic and morphological traits in maize

Estimation of epistasis in doubled haploid barley populations considering interactions between all possible marker pairs

Estimación de parámetros genéticos y selección de líneas S1 en una población segregante de maíz tropical

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