&lt;b&gt;Breeding potential of S4 maize lines in topcrosses for agronomic and forage traits

Marcondes, Mariana Martins; Faria, Marcos Ventura; Mendes, Marcelo Cruz; Gabriel, André; Neiverth, Victor; Zocche, Jean Carlos

doi:10.4025/actasciagron.v38i3.28307

Cited by 11 publications

(19 citation statements)

References 30 publications

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“…In this work, top cross hybrids with high yield potential were achieved, with yields similar to or higher than the commercial control (AG 1051). These findings show the high yield potential of hybrids from partially inbred S 1 lines, confirming the results achieved by Souza Júnior (1995); Ferreira et al (2009); Marcondes et al (2015); and Marcondes et al (2016), who reported the feasibility of yielding maize hybrids using partially inbred lines. The five top cross hybrids that had the highest yield of ears with straw were 10, 19, 5, 6, and 25, while for commercial ears they were 19, 48, 6, 28, and 42.…”

Section: Analysis Of Variancesupporting

confidence: 89%

Yield potential of green maize from partially inbred lines in top crosses

et al. 2020

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Selecting potential progenies in early inbred generations is an essential step towards the success of breeding programs. Given this, the use of top crosses assists breeders in selecting progenies to generate lines with the potential for hybrid yield. Thus, the purpose of this study was to assess the behavior of partially inbred progenies (S1) of maize with potential for green maize yield in top crosses and to evaluate the hybrid performance. Seventy-five top cross hybrids were generated from the cross between 75 S1 progenies and the F2 generation of the hybrid AG 1051. The 75 hybrids, the male tester (F2 generation of the hybrid AG 1051 as a broad genetic base tester), and the hybrid AG 1051 were sown in a block design with four replicates. The following traits were evaluated: husked ear yield; commercial ear yield; flowering; plant height; strawing; mean weight of grain mass in green maize stage; tassel branch number; ear row number; ear length; and ear diameter. The analysis of variance was performed estimating the general combining ability, and, from the means, the Scott & Knott test was conducted. The top cross hybrids that were prominent for commercial ear yield were those composed of partially inbred progenies 19, 48, 6, 28, and 42 with high GCA, suggesting a potential for the production of open pollination population or synthetic production as well.

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Section: Analysis Of Variancesupporting

confidence: 89%

Yield potential of green maize from partially inbred lines in top crosses

et al. 2020

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“…In a corn crop, the grain yield is a polygenic trait and is strongly influenced by the environment (Hallauer et al, 2010), with h a 2 estimates of 20% (Idris and Abuali, 2011;Marcondes et al, 2016) to over 80% Bello et al, 2012;Ertiro et al, 2013). The h a 2 values observed for grain yield were high in both our experiments, varying from 73.53% (Guarapuava) to 74.41% (Candói).…”

Section: Individual and Join Analyses Of Variance And Heritabilitysupporting

confidence: 43%

“…Many studies have indicated interactions between corn genotypes and the environment for several important traits such as grain yield and bromatological quality of silage (Gralak et al, 2014;de Souza Neto et al, 2015;Marcondes et al, 2015;Mendes et al, 2015;Marcondes et al, 2016).…”

Section: Individual and Join Analyses Of Variance And Heritabilitymentioning

confidence: 99%

“…Ertiro et al (2013) reported high h a 2 values for in vitro dry matter digestibility (80%), and ADIF and NDIF (81%), and the results were close to those from our current study. Marcondes et al (2016) evaluated top-crosses of hybrids of partially inbred lines with elite lines and observed heritability values for ADIF and NDIF of 58% and 75%, respectively. They concluded that satisfactory genetic gains may be achieved by the selection of individual plants with lower fiber content.…”

Section: Individual and Join Analyses Of Variance And Heritabilitymentioning

confidence: 99%

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Genetic divergence among corn hybrids and combining ability for agronomic and bromatological traits of silage

et al. 2017

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ABSTRACT.We assessed the impact of genetic divergence and the ability to combine corn hybrids used for the production of silage on the agronomic and bromatological traits of silage quality. We evaluated 18 corn hybrids used as genitors in a circulant diallel scheme in which each genitor hybrid participated in 9 hybrid combinations, and evaluated 100 treatments [18 genitor hybrids, 81 diallelic hybrids, and a commercial check hybrid (DKB330)] in a triple lattice 10 x 10 experimental design in two environments in Brazil. Genetic variability 2 E. Gralak et al.Genetics and Molecular Research 16 (2): gmr16029643 was adequate among the corn silage hybrids, and we can recommend the use of genitors 2B688 and P30B39 for the formation of a base population for intrapopulational breeding. The P30P34 hybrid is the best for intrapopulational breeding when aiming for silage with high protein content, low fiber content, and higher in vitro digestibility. Interpopulational breeding directed at improving silage digestibility can use a combination of genitors P30P34 and AS1572, but AS1572 and P30K64 are the most recommended. Hybrids 2B688, P30P34, and SG6015 are considered the most genetically distant of the others hybrids, and have desirable combining potential; therefore, they are important genitors for the formation of new segregated populations for improving corn silage.

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“…De acordo com Amorim e Souza (2005), os híbridos comerciais foram testados em diversos ambientes, e estes genótipos possuem grande quantidade de alelos favoráveis fixados, para diversas características, como resistência a doenças, arquitetura de plantas, ciclo e produtividade de grãos. Vários trabalhos demonstram que a utilização de híbridos comerciais é viável para a formação de populações-base para obtenção de linhagens (Pfann et al, 2009;Ferreira et al, 2010;Oliboni et al, 2013;Gralak et al, 2015;Mendes et al, 2015;Marcondes et al, 2016). Nas gerações iniciais de endogamia é possí-vel obter um grande número de linhagens, das quais muitas apresentam baixa frequência de alelos favoráveis, ou seja, não são de interesse ao melhoramento.…”

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Avaliação De Linhagens S2 De Milho Em Topcrosses Com Linhagem Elite Testadora

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RESUMO -O objetivo desde estudo foi avaliar o potencial de linhagens (S2) de milho em cruzamentos topcrosses,usando como testador uma linhagem-elite. Foram conduzidos quatro experimentos, dois na região Centro-Sul do Paraná e dois na região Noroeste de Minas Gerais. Em cada experimento foram avaliados 121 tratamentos, sendo 108 híbridos topcrosses de linhagens S2 cruzadas com uma linhagem-elite testadora e 13 híbridos comerciais (testemunhas). O delineamento utilizado foi o látice triplo 11x11. As parcelas foram compostas de uma linha com 5 metros, espaçamento de 0,80 metros entre linhas com população de 62.500 plantas por hectare. Foram avaliadas as características agronômicas altura de planta (AP) e espiga (AE), produtividade e estabilidade produtiva de grãos (PG). Os dados foram submetidos à análise de variância individual e conjunta, estabilidade e adaptabilidade (Annicchiarico) utilizando o programa GENES; as médias foram agrupadas pelo teste de Scott Knott a 5% de probabilidade. Para AP e AE, houve interação genótipos x ambientes significativa. A linhagem-elite utilizada como testadora foi eficiente na discriminação do mérito relativo das linhagens S2 em cruzamentos topcrosses. As linhagens S2 cujas combinações híbridas em topcrosses com o testador apresentaram elevado potencial genético deverão ser avançadas no programa de melhoramento. Os híbridos topcrosses HTC 11, HTC 15, HTC 44, HTC 52, HTC 56, HTC 72 e HTC 86 apresentaram boa produtividade de grãos e estabilidade em todos os ambientes estudados. Palavras-chave: Zea mays, Annicchiarico, produtividade de grãos, adaptabilidade, estabilidade fenotípica. EVALUATION OF CORN S 2 LINES IN TOPCROSSES WITH ELITE LINE TESTERABSTRACT -The objective was to evaluate the potential of partly inbred lines (S 2 ) of corn in topcrosses, using an elite inbred line as a tester. Four experiments were conducted, two in the south center region of Paraná State and two in the northwest region of Minas Gerais State. We evaluated 121treatments in each experiment, i.e. , 108 topcrosses hybrids from S 2 lines crossed with a tester inbred line and 13 commercial hybrids (checks). The genotyps were evaluated in triple lattice design 11x11. The plots were composed of a line with 5 meters spacing of 0.80 meters between lines with a population of 62,500 plants per hectare. We evaluated the agronomic characteristics plant height and ear , grain yield and stability and adaptability of grain yield. Data were subjected to individual and joint analysis of variance, and stability and adaptability (Annicchiarico) using the GENES program. The means were grouped by the Scott Knott test at 5% probability. For plant height and ear height, there was significant genotypes x environments interaction. The elite inbred line used as tester was efficient in the discrimination of the relative merits of S 2 lines in topcrosses . The S 2 partly inbred lines whose had high genetic potential in topcrosses should be advanced in the breeding program. The topcrosses hybrids, HTC 11, HTC 15, HTC 44, HTC 52, HTC ...

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<b>Breeding potential of S4 maize lines in topcrosses for agronomic and forage traits

Cited by 11 publications

References 30 publications

Yield potential of green maize from partially inbred lines in top crosses

Yield potential of green maize from partially inbred lines in top crosses

Genetic divergence among corn hybrids and combining ability for agronomic and bromatological traits of silage

Avaliação De Linhagens S2 De Milho Em Topcrosses Com Linhagem Elite Testadora

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