Inbreeding depression and performance of partially self-fertilized maize progenies in a top cross

ABSTRACT Information on the effect of endogamy and combining ability of inbred families is essential in hybrid maize (Zea mays L.) breeding programs. The objective of this study was to evaluate the effect of inbreeding in a maize population and the performance of top-cross hybrids from this populati...

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Autores principales:	Somera,Andreia, Ragagnin,Angelita L.S.L., Costa,Maraiza L., Candido,Willame dos S., Reis,Edésio F. dos
Lenguaje:	English
Publicado:	Instituto de Investigaciones Agropecuarias, INIA 2018
Materias:	Hybrid S2 line synthetic variety Zea mays.
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392018000300318
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spelling	oai:scielo:S0718-583920180003003182018-11-14Inbreeding depression and performance of partially self-fertilized maize progenies in a top crossSomera,AndreiaRagagnin,Angelita L.S.L.Costa,Maraiza L.Candido,Willame dos S.Reis,Edésio F. dos Hybrid S2 line synthetic variety Zea mays. ABSTRACT Information on the effect of endogamy and combining ability of inbred families is essential in hybrid maize (Zea mays L.) breeding programs. The objective of this study was to evaluate the effect of inbreeding in a maize population and the performance of top-cross hybrids from this population, with a broad genetic base tester. First, 110 S1 families were generated and established in the field along with families from the original population. The experiment was arranged in a randomized block design with three replicates, in 3.0 m plots with 15 plants. Traits of agronomic importance, inbreeding depression, and the general effect of dominance deviations were estimated the first stage. In the second stage, 69 inbred families (S2) with low inbreeding depression were evaluated by top-cross tests using the F2 generation of the commercial hybrid AG 6040 as tester. The same traits from the first stage were evaluated. Inbreeding depression in the first stage was higher for traits related to production, which indicates that the heterozygous loci contribute more to these traits, with the additive effects being less important. In the second stage, the best estimates of the general combining ability (GCA) for grain weight were found in progenies 51, 33, 17, 9, 3, and 67, showing good performance and good potential for use in breeding programs.info:eu-repo/semantics/openAccessInstituto de Investigaciones Agropecuarias, INIAChilean journal of agricultural research v.78 n.3 20182018-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392018000300318en10.4067/S0718-58392018000300318
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Hybrid S2 line synthetic variety Zea mays.
spellingShingle	Hybrid S2 line synthetic variety Zea mays. Somera,Andreia Ragagnin,Angelita L.S.L. Costa,Maraiza L. Candido,Willame dos S. Reis,Edésio F. dos Inbreeding depression and performance of partially self-fertilized maize progenies in a top cross
description	ABSTRACT Information on the effect of endogamy and combining ability of inbred families is essential in hybrid maize (Zea mays L.) breeding programs. The objective of this study was to evaluate the effect of inbreeding in a maize population and the performance of top-cross hybrids from this population, with a broad genetic base tester. First, 110 S1 families were generated and established in the field along with families from the original population. The experiment was arranged in a randomized block design with three replicates, in 3.0 m plots with 15 plants. Traits of agronomic importance, inbreeding depression, and the general effect of dominance deviations were estimated the first stage. In the second stage, 69 inbred families (S2) with low inbreeding depression were evaluated by top-cross tests using the F2 generation of the commercial hybrid AG 6040 as tester. The same traits from the first stage were evaluated. Inbreeding depression in the first stage was higher for traits related to production, which indicates that the heterozygous loci contribute more to these traits, with the additive effects being less important. In the second stage, the best estimates of the general combining ability (GCA) for grain weight were found in progenies 51, 33, 17, 9, 3, and 67, showing good performance and good potential for use in breeding programs.
author	Somera,Andreia Ragagnin,Angelita L.S.L. Costa,Maraiza L. Candido,Willame dos S. Reis,Edésio F. dos
author_facet	Somera,Andreia Ragagnin,Angelita L.S.L. Costa,Maraiza L. Candido,Willame dos S. Reis,Edésio F. dos
author_sort	Somera,Andreia
title	Inbreeding depression and performance of partially self-fertilized maize progenies in a top cross
title_short	Inbreeding depression and performance of partially self-fertilized maize progenies in a top cross
title_full	Inbreeding depression and performance of partially self-fertilized maize progenies in a top cross
title_fullStr	Inbreeding depression and performance of partially self-fertilized maize progenies in a top cross
title_full_unstemmed	Inbreeding depression and performance of partially self-fertilized maize progenies in a top cross
title_sort	inbreeding depression and performance of partially self-fertilized maize progenies in a top cross
publisher	Instituto de Investigaciones Agropecuarias, INIA
publishDate	2018
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392018000300318
work_keys_str_mv	AT someraandreia inbreedingdepressionandperformanceofpartiallyselffertilizedmaizeprogeniesinatopcross AT ragagninangelitalsl inbreedingdepressionandperformanceofpartiallyselffertilizedmaizeprogeniesinatopcross AT costamaraizal inbreedingdepressionandperformanceofpartiallyselffertilizedmaizeprogeniesinatopcross AT candidowillamedoss inbreedingdepressionandperformanceofpartiallyselffertilizedmaizeprogeniesinatopcross AT reisedesiofdos inbreedingdepressionandperformanceofpartiallyselffertilizedmaizeprogeniesinatopcross
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Inbreeding depression and performance of partially self-fertilized maize progenies in a top cross

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