Testcross vs randomly‐paired single cross progeny tests for genomic prediction of new inbreds and hybrids derived from multi‐parent maize populations

Crop Science ◽  
2021 ◽  
Author(s):  
Brett Burdo ◽  
Natalia Leon ◽  
Shawn M. Kaeppler
Keyword(s):  
Genomic Prediction ◽  
Maize Populations ◽  
Single Cross ◽  
Progeny Tests

Novel strategies for genomic prediction of untested single-cross maize hybrids using unbalanced historical data

2019 ◽  
Vol 133 (2) ◽  
pp. 443-455 ◽  
Author(s):  
K. O. G. Dias ◽  
H. P. Piepho ◽  
L. J. M. Guimarães ◽  
P. E. O. Guimarães ◽  
S. N. Parentoni ◽  
...  
Keyword(s):  
Genomic Prediction ◽  
Historical Data ◽  
Maize Hybrids ◽  
Single Cross

Performance evaluation and genetic analysis of maize populations and diallel crosses under irrigated and drought-stressed conditions

2009 ◽  
Vol 57 (3) ◽  
pp. 255-265
Author(s):  
G. Evgenidis ◽  
V. Mellidis ◽  
C. Karamaligkas ◽  
M. Koutsika-Sotiriou
Keyword(s):  
Water Stress ◽  
Drought Stress ◽  
Diallel Analysis ◽  
Diallel Crosses ◽  
Maize Germplasm ◽  
Maize Populations ◽  
Single Cross ◽  
Average Water ◽  
Source Populations ◽  
Single Cross Hybrids

This study aimed to assess the response of eight maize populations and their 28 diallel crosses to water stress and conventional irrigation. The source populations consisted of maize germplasm from CIMMYT and the F 2 generation of commercial single-cross hybrids. The trials were conducted at three locations in two successive years. Six characteristics relevant to drought stress were recorded. On average, water stress reduced the plant height and ear attachment height, and increased the number of days to silking and the anthesis to silking interval (ASI). The reductions were greater in the diallel crosses, and the increases in the parental populations. At one location, where irrigated and drought-stressed treatments were established side by side, diallel analysis for yield revealed that: (i) the control (B73 × Mo17) and the commercial hybrid Costanza had significantly reduced yield under drought stress; (ii) the general (GCA) and specific (SCA) combining ability were significantly higher in the irrigated experiments; and (iii) populations derived from the F 2 generation showed higher GCA.

scholarly journals Genomic Prediction of Hybrid Combinations in the Early Stages of a Maize Hybrid Breeding Pipeline

2016 ◽  
Author(s):  
D.C. Kadam ◽  
S.M. Potts ◽  
M.O. Bohn ◽  
A.E. Lipka ◽  
A.J. Lorenz
Keyword(s):  
Genomic Prediction ◽  
Cross Validation ◽  
Hybrid Breeding ◽  
Maize Breeding ◽  
Cross Prediction ◽  
Maize Hybrids ◽  
Early Stages ◽  
Single Cross ◽  
Hybrid Maize ◽  
Single Cross Hybrids

AbstractPrediction of single-cross hybrid performance has been a major goal of plant breeders since the beginning of hybrid breeding. Genomic prediction has shown to be a promising approach, but only limited studies have examined the accuracy of predicting single cross performance. Most of the studies rather focused on predicting top cross performance using single tester to determine the inbred parent’s worth in hybrid combinations. Moreover, no studies have examined the potential of predicting single crosses made among random progenies derived from a series of biparental families, which resembles the structure of germplasm comprising the initial stages of a hybrid maize breeding pipeline. The main objective of this study was to evaluate the potential of genomic prediction for identifying superior single crosses early in the breeding pipeline and optimize its application. To accomplish these objectives, we designed and analyzed a novel population of single-cross hybrids representing the Iowa Stiff Stalk Synthetic/Non-Stiff Stalk heterotic pattern commonly used in the development of North American commercial maize hybrids. The single cross prediction accuracies estimated using cross-validation ranged from 0.40 to 0.74 for grain yield, 0.68 to 0.91 for plant height and 0.54 to 0.94 for staygreen depending on the number of tested parents of the single crosses. The genomic estimated general and specific combining abilities showed a clear advantage over the use of genomic covariances among single crosses, especially when one or both parents of the single cross were untested in hybrid combinations. Overall, our results suggest that genomic prediction of the performance of single crosses made using random progenies from the early stages of the breeding pipeline holds great potential to re-design hybrid breeding and increase its efficiency.

scholarly journals POTENCIAL DE LINHAGENS ORIUNDAS DE POPULAÇÕES DE MILHO BRAQUÍTICO PARA OBTENÇÃO DE HÍBRIDOS

2017 ◽  
Vol 16 (1) ◽  
pp. 120
Author(s):  
BELISA CRISTINA SAITO ◽  
JOÃO ANTÔNIO DA COSTA ANDRADE
Keyword(s):  
Grain Yield ◽  
Combining Ability ◽  
Inbred Lines ◽  
General Combining Ability ◽  
Maize Populations ◽  
Single Cross ◽  
Ear Height ◽  
Stalk Lodging ◽  
Partial Diallel ◽  
Single Cross Hybrids

RESUMO - O objetivo do trabalho foi a identificar linhagens com alta capacidade de combinação visando o desenvolvimento de híbridos simples adaptados à condição de elevada densidade populacional de plantas. Treze linhagens originadas de duas populações de milho braquítico foram cruzadas seguindo o esquema de dialelo parcial (6x7). Os híbridos simples foram avaliados em duas safras (primeira e segunda safras). Os efeitos da interação entre as capacidades gerais de combinação (CGC) e safras foram diferentes para rendimento de grãos apenas para linhagens Isanão-VD1, enquanto que para a altura de plantas, altura de espigas e acamamento mais quebramento os efeitos da interação CGCs x safras foram diferentes para ambos os grupos de linhagens. Levando em consideração apenas o rendimento de grãos, os melhores híbridos são esperados entre as linhagens IVF1-5 e IVF1-10 da população Isanão VF1 e IVD1-1 e IVD1-2 da população Isanão-VD1. Considerando-se todos os caracteres, as linhagens promissoras para a primeira safra são IVF1-6, IVD1-1 e IVD1-5, e para a segunda safra as linhagens são IVF1-10, IVD1-8 e IVD1-9. Os híbridos mais adequados são IVF1-10 x IVD1-5 para primeira safra e IVF1-10 x IVD1-8 e IVF1-10 xIVD1-9 para a segunda.Palavras-chave: dialelo parcial, capacidade geral de combinação, capacidade específica de combinação.POTENTIAL OF INBRED LINES DERIVED FROM BRACHYTIC MAIZE POPULATIONS FOR OBTAINING HYBRIDSABSTRACT - The objective of this study was to identify parents with high combining ability aiming at the development of outstanding hybrids. Thirteen inbred lines originated of two brachytic maize populations were crossed following the partial diallel (6x7) scheme. The single-cross hybrids were evaluated in two crop seasons (regular crop and second crop). The effects of interaction general combining abilities (GCAs) x seasons were different for yield only for lines of Isanão-VD-1, while for plant height, ear height and stalk lodging and breaking, the effects of interaction GCAs x seasons were different for both groups of lines. Taking into account only the grain yield, the best hybrids are expected between the inbred lines IVF1-5, and IVF1-10, of the population Isanão-VF1 and IVD1-1 and IVD1-2 and IVD1-5 of the population Isanão-VD1. Considering all the traits, the inbred lines promising for the first crop are IVF1-6, IVD1-1 and IVD1-5 and for the second crop are the inbred lines IVF1-10, IVD1-8 and IVD1-9. The most suitable hybrids are IVF1-10 x IVD1-5 for the first crop and IVF1-10 x IVD1-8, and IVF1-10 xIVD1-9 for second crop.Keywords: partial diallel, general combining ability, specific combining ability.

scholarly journals Genomic prediction in biparental tropical maize populations in water-stressed and well-watered environments using low-density and GBS SNPs

Heredity ◽  
2014 ◽  
Vol 114 (3) ◽  
pp. 291-299 ◽  
Author(s):  
X Zhang ◽  
P Pérez-Rodríguez ◽  
K Semagn ◽  
Y Beyene ◽  
R Babu ◽  
...  
Keyword(s):  
Genomic Prediction ◽  
Low Density ◽  
Tropical Maize ◽  
Maize Populations
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