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 Prediction of Maize Single Cross Hybrids Using the Total Effects of Associated Markers Approach Assessed by Cross-Validation and Regional Trials

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Wagner Mateus Costa Melo ◽  
Renzo Garcia Von Pinho ◽  
Marcio Balestre
Keyword(s):  
Training Trial ◽  
Cross Validation ◽  
Predictive Accuracy ◽  
Field Performance ◽  
Training Population ◽  
Maize Hybrids ◽  
Single Cross ◽  
The Cross ◽  
Predictive Validation ◽  
Single Cross Hybrids

The present study aimed to predict the performance of maize hybrids and assess whether the total effects of associated markers (TEAM) method can correctly predict hybrids using cross-validation and regional trials. The training was performed in 7 locations of Southern Brazil during the 2010/11 harvest. The regional assays were conducted in 6 different South Brazilian locations during the 2011/12 harvest. In the training trial, 51 lines from different backgrounds were used to create 58 single cross hybrids. Seventy-nine microsatellite markers were used to genotype these 51 lines. In the cross-validation method the predictive accuracy ranged from 0.10 to 0.96, depending on the sample size. Furthermore, the accuracy was 0.30 when the values of hybrids that were not used in the training population (119) were predicted for the regional assays. Regarding selective loss, the TEAM method correctly predicted 50% of the hybrids selected in the regional assays. There was also loss in only 33% of cases; that is, only 33% of the materials predicted to be good in training trial were considered to be bad in regional assays. Our results show that the predictive validation of different crop conditions is possible, and the cross-validation results strikingly represented the field performance.

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

scholarly journals Combining ability and response to CMS in reverse diploid maize lines developed at VIR

2020 ◽  
Vol 2 (4) ◽  
pp. 15-23
Author(s):  
E. B. Khatefov ◽  
B. R. Shomakhov ◽  
R. S. Kushkhova ◽  
R. A. Kudaev ◽  
Z. T. Khashirova ◽  
...  
Keyword(s):  
Combining Ability ◽  
Selection Index ◽  
Inbred Lines ◽  
Breeding Value ◽  
Hybrid Breeding ◽  
Maize Breeding ◽  
Tetraploid Population ◽  
Grain Moisture ◽  
Hybrid Maize ◽  
Period Duration

Abstract. Hybrid maize breeding requires constant renewal of the source material. In this regard, broadening of genetic variation in parental lines is one of the primary tasks in heterotic hybrid breeding programs. The use of reverse diploid inbred lines derived from a tetraploid population is considered as an innovative approach to achieve this goal.Results. The investigated material comprised 106 reverse diploid (rediploid) inbred lines originating from diploid plants selected in segregating selfed progenies of triploid populations and consequently subjected to inbreeding, while triploid populations resulted from a cross between plants of a tetraploid population with a broad genetic basis and a diploid line. The use of a system of crosses with 37 sterile testers belonging to different FAO maize maturity groups allowed the evaluation of the rediploid lines’ combining ability and the response to M and C types of CMS. Field tests were conducted in 2019 in the steppe zone of Kabardino-Balkaria. Forty-six lines (43.3%) with the combining ability ranging from ultra-high to good, and 78 lines (73.6%) maintaining the CMS character were identified. Among them, 59 lines (55.7%) were maintainers for the M type CMS, 15 lines (14.1%)  for C type CMS, and 4 lines maintained sterility for both CMS types. Sixteen lines (15.1%) restored pollen fertility of the forms with M type CMS, 11 lines (10.4%) were restorers for the C-type and one line turned out to be a universal restorer for both CMS types. Ranking by the “sprout - flowering of ears” interstage period duration showed that most of the lines (66.0%) with the ability to maintain sterility or restore male fertility of M and C CMS types, as well as with the combining ability from ultrahigh to good (32.6%) fell into the group with the flowering period duration of 51-55 days. According to the results of the harvested grain moisture assessment, the hybrids ♀(РГС246с × OL213) × ♂92с5986·2·3, ♀714М  ×  ♂1/67-1 and ♀714М  ×  ♂92н136-4, with the values of 13, 6%, 13.9%, 14.0%, respectively, were identified. The hybrids ♀714М × ♂1/67- 1 and ♀(OL563С × KL1392) × ♂92с0653 2 1 2 were characterized by the maximum value of the selection index, i.e. 5.03 and 5.13, respectively.Conclusions. The results of the studies showed the breeding value of rediploid lines as an initial material for hybrid maize breeding. 

scholarly journals Diallel analysis of popcorn lines and hybrids for baby corn production

2015 ◽  
Vol 15 (1) ◽  
pp. 33-39 ◽  
Author(s):  
Lucas Rafael de Souza Camacho ◽  
Carlos Alberto Scapim ◽  
Henrique José Camargo Senhorinho ◽  
Thiago Vincenzi Conrado
Keyword(s):  
Recurrent Selection ◽  
Diallel Analysis ◽  
Hybrid Breeding ◽  
Corn Production ◽  
Breeding Programs ◽  
Group I ◽  
Synthetic Populations ◽  
Single Cross ◽  
Group Ii ◽  
Single Cross Hybrids

The aim of this study was to evaluate the combining ability of popcorn lines and hybrids with favorable traits for baby corn production, using lines extracted from the major genotypes of the Brazilian germplasm. From nine popcorn lines, derived from the genotypes Zélia, CMS 42, CMS 43, UEM M2, Zaeli and IAC 112, 36 single-cross hybrids were obtained without reciprocals. In partial diallel crosses, 25 single-cross hybrids were obtained, derived from crosses of five lines of the Zaeli (group I) with five lines from IAC 112 (group II). We recommend using lines derived from Zaeli and CMS 42 in hybrid breeding programs for higher ear yields. The lines P9.5.1 and P9.5.5 (group I) and P8.3 and P8.5 (group II) can be recommended for recombination within each group and for the formation of two synthetic populations for recurrent selection, in order to increase ear yield.

scholarly journals Uso potencial de cruzas simples emparentadas de ciclo vegetativo intermedio para regiones subtropicales de México.

2016 ◽  
Vol 8 (2) ◽  
pp. 72
Author(s):  
Ernesto Preciado ◽  
Arturo Terron
Keyword(s):  
Genetic Material ◽  
Inbred Lines ◽  
High Yield ◽  
Maize Breeding ◽  
Release Process ◽  
Experimental Station ◽  
Inbred Parent ◽  
Single Cross ◽  
Yield Trials ◽  
Single Cross Hybrids

The maize breeding program and the Bajío Experimental Station, which belongs to the National Institute of Agriculture, Forestry and Livestock (INIFAP), located in the State of Guanajuato, Mexico, during 1994 and 1995, we evaluated yield trials with four types of genetic material: a. Original inbred lines wich are parents of superior single croses, under the release process. b. Modified parts coming from the cross of the original inbred parent, with a relative inbred line derived from the same germplasm source. c. Theoriginal single cross hybrids, and d. The modifield new crosses from the related parents. The results showed that the modified parents outyield in the original inbred lines, in some cases was of more than 300%. Moreover, some modified hybrids were statistically similar to the original single cross hybrids, as well as in some later commercial checks. The heterotic response, previously identified in specific single hybrids, was kept when we utilized modified parents with high yield. All this supported the idea that this kind of hybrids represent a large potential in the regions where the use of conventional single cross hybrids, is still limited.

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

2016 ◽  
Vol 6 (11) ◽  
pp. 3443-3453 ◽  
Author(s):  
Dnyaneshwar C. Kadam ◽  
Sarah M. Potts ◽  
Martin O. Bohn ◽  
Alexander E. Lipka ◽  
Aaron J. Lorenz
Keyword(s):  
Genomic Prediction ◽  
Hybrid Breeding ◽  
Maize Hybrid ◽  
Early Stages

scholarly journals Evaluation of genotype x environment interactions in maize hybrids using GGE biplot analysis

2011 ◽  
Vol 11 (1) ◽  
pp. 01-09 ◽  
Author(s):  
Fatma Aykut Tonk ◽  
Emre Ilker ◽  
Muzaffer Tosun
Keyword(s):  
Grain Yield ◽  
Gge Biplot ◽  
Maize Breeding ◽  
Private Companies ◽  
Breeding Programs ◽  
Maize Hybrids ◽  
Biplot Analysis ◽  
Maize Genotypes ◽  
Cropping Seasons ◽  
Hybrid Maize

Seventeen hybrid maize genotypes were evaluated at four different locations in 2005 and 2006 cropping seasons under irrigated conditions in Turkey. The analysis of variance showed that mean squares of environments (E), genotypes (G) and GE interactions (GEI) were highly significant and accounted for 74, 7 and 19 % of treatment combination sum squares, respectively. To determine the effects of GEI on grain yield, the data were subjected to the GGE biplot analysis. Maize hybrid G16 can be proposed as reliably growing in test locations for high grain yield. Also, only the Yenisehir location could be best representative of overall, locations for deciding about which experimental hybrids can be recommended for grain yield in this study. Consequently, using of grain yield per plant instead of grain yield per plot in hybrid maize breeding programs could be preferred by private companies due to some advantages.

scholarly journals Estimation of heterosis in yield and yield attributing traits in single cross hybrids of maize

2016 ◽  
Vol 2 (1) ◽  
pp. 123-132 ◽  
Author(s):  
Hari Prasad Sharma ◽  
Krishna Hari Dhakal ◽  
Raju Kharel ◽  
Jiban Shrestha
Keyword(s):  
Grain Yield ◽  
Block Design ◽  
Winter Season ◽  
Maize Production ◽  
Yield Attributes ◽  
Maize Hybrids ◽  
Randomized Complete Block Design ◽  
Single Cross ◽  
Standard Heterosis ◽  
Single Cross Hybrids

A field experiment was conducted at National Maize Research Program, Rampur, Chitwan, Nepal during winter season from 6th October, 2015 to 5th March 2016 to estimate different heterosis on single cross maize hybrids . Thirteen maize hybrids were tested randomized complete block design with three replications. Hybrid namely RML-98/RL-105 gave the highest standard heterosis (57.5%) for grain yield over CP-666 followed by RML-4/NML-2 (32.6%), RML-95/RL-105 (29%) and RML-5/RL-105 (20.6%). The hybrid RML-98/RL-105 produced the highest standard heterosis (75.1%) for grain yield over Rajkumar followed by RML-4/NML-2(50.2%), RML-95/RL-105(46.6%), RML-5/RL-105 and (35.7%). Mid and better parent heterosis were significantly higher for yield and yield attributes viz. ear length, ear diameter, no of kernel row per ear, no of kernel per row and test weight. The highest positive mid-parent heterosis for grain yield was found in RML-98/RL-105 followed by RML-5/RL-105, RML-95/RL-105, and RML-4/NML-2. For the grain yield the better parent heterosis was the highest in RML-98/RL-105, followed by RML-5/RL-105, RML-95/RL-105, and RML-4/NML-2. These results suggested that maize production can be maximized by cultivating hybrids namely RML-98/RL-105, RML-5/RL-105, RML-95/RL-105, and RML-4/NML-2.

scholarly journals Assesment of recombinant lines of maize hybrids for inbred development

2015 ◽  
Vol 43 (3) ◽  
pp. 363-366
Author(s):  
Uttam Chandel ◽  
BS Mankotia ◽  
KS Thakur
Keyword(s):  
Inbreeding Depression ◽  
Combining Ability ◽  
General Combining Ability ◽  
Specific Combining Ability ◽  
Lower Percentage ◽  
Maize Hybrids ◽  
Mating Design ◽  
Commercial Company ◽  
Single Cross ◽  
Single Cross Hybrids

Maize (Zea mays L.) breeders currently exploit genetically narrow-base populations by deriving the recombination lines from F2 of commercial single cross hybrids. A mating design was proposed for maize hybrid evaluation as source germplasm. The commercial single cross hybrids, Hi Shell, DKC 7074 and PMZ 4, developed by the commercial company, Monsanto, were evaluated for their usefulness as germplasm. According to mating design three criteria were used: the percentage of inbreeding depression, the general combining ability and the specific combining ability. PMZ 4 had a lower percentage (21.9) of inbreeding depression, which was also combined with positive general combining ability (7.5) and negative specific combining ability. The estimated percentage of inbreeding depression was greater in DKC 7074 (31.4) and in Hi Shell (25.3). DKC 7074 also had negative general combining ability (35.5), while Hi Shell had positive specific combining ability (75.0). Therefore, evaluation through mating design showed PMZ 4 possesses more desirable genes and that it’s F2 may be a more profitable germplasm for developing elite inbred lines DOI: http://dx.doi.org/10.3329/bjb.v43i3.21615 Bangladesh J. Bot. 43(3): 363-366, 2014 (December)

Sign in / Sign up

Export Citation Format

Share Document