Hybrid maize breeding with doubled haploids: V. Selection strategies for testcross performance with variable sizes of crosses and S1 families

2009 ◽  
Vol 120 (4) ◽  
pp. 699-708 ◽  
Author(s):  
Thilo Wegenast ◽  
H. Friedrich Utz ◽  
C. Friedrich H. Longin ◽  
Hans Peter Maurer ◽  
Baldev S. Dhillon ◽  
...  
Keyword(s):  
Doubled Haploids ◽  
Maize Breeding ◽  
Testcross Performance ◽  
Selection Strategies ◽  
Hybrid Maize

scholarly journals Erratum to: Hybrid maize breeding with doubled haploids: V. Selection strategies for testcross performance with variable sizes of crosses and S1 families

2010 ◽  
Vol 121 (7) ◽  
pp. 1391-1393 ◽  
Author(s):  
Thilo Wegenast ◽  
H. Friedrich Utz ◽  
C. Friedrich H. Longin ◽  
Hans Peter Maurer ◽  
Baldev S. Dhillon ◽  
...  
Keyword(s):  
Doubled Haploids ◽  
Maize Breeding ◽  
Testcross Performance ◽  
Selection Strategies ◽  
Hybrid Maize

Hybrid maize breeding with doubled haploids. IV. Number versus size of crosses and importance of parental selection in two-stage selection for testcross performance

2008 ◽  
Vol 117 (2) ◽  
pp. 251-260 ◽  
Author(s):  
Thilo Wegenast ◽  
C. Friedrich H. Longin ◽  
H. Friedrich Utz ◽  
Albrecht E. Melchinger ◽  
Hans Peter Maurer ◽  
...  
Keyword(s):  
Doubled Haploids ◽  
Maize Breeding ◽  
Two Stage ◽  
Parental Selection ◽  
Testcross Performance ◽  
Selection For ◽  
Hybrid Maize

Hybrid maize breeding with doubled haploids: I. One-stage versus two-stage selection for testcross performance

2006 ◽  
Vol 112 (5) ◽  
pp. 903-912 ◽  
Author(s):  
C. Friedrich H. Longin ◽  
H. Friedrich Utz ◽  
Jochen C. Reif ◽  
Wolfgang Schipprack ◽  
Albrecht E. Melchinger
Keyword(s):  
Doubled Haploids ◽  
Stage Versus ◽  
Maize Breeding ◽  
Two Stage ◽  
Testcross Performance ◽  
One Stage ◽  
Selection For ◽  
Hybrid Maize

Hybrid maize breeding with doubled haploids: III. Efficiency of early testing prior to doubled haploid production in two-stage selection for testcross performance

2007 ◽  
Vol 115 (4) ◽  
pp. 519-527 ◽  
Author(s):  
C. Friedrich H. Longin ◽  
H. Friedrich Utz ◽  
Jochen C. Reif ◽  
Thilo Wegenast ◽  
Wolfgang Schipprack ◽  
...  
Keyword(s):  
Doubled Haploid ◽  
Doubled Haploids ◽  
Maize Breeding ◽  
Two Stage ◽  
Testcross Performance ◽  
Haploid Production ◽  
Early Testing ◽  
Selection For ◽  
Hybrid Maize

Hybrid maize breeding with doubled haploids: Comparison between selection criteria

2006 ◽  
Vol 54 (3) ◽  
pp. 343-350 ◽  
Author(s):  
C. F. H. Longin ◽  
H. F. Utz ◽  
A. E. Melchinger ◽  
J.C. Reif
Keyword(s):  
Selection Criteria ◽  
Doubled Haploids ◽  
Optimum Allocation ◽  
Finite Sample ◽  
Sample Sizes ◽  
Maize Breeding ◽  
Selection Gain ◽  
Breeding Programmes ◽  
Hybrid Maize ◽  
Breeding Resources

The optimum allocation of breeding resources is crucial for the efficiency of breeding programmes. The objectives were to (i) compare selection gain ΔGk for finite and infinite sample sizes, (ii) compare ΔGk and the probability of identifying superior hybrids (Pk), and (iii) determine the optimum allocation of the number of hybrids and test locations in hybrid maize breeding using doubled haploids. Infinite compared to finite sample sizes led to almost identical optimum allocation of test resources, but to an inflation of ΔGk. This inflation decreased as the budget and the number of finally selected hybrids increased. A reasonable Pk was reached for hybrids belonging to the q = 1% best of the population. The optimum allocations for Pk(q) and ΔGkwere similar, indicating that Pk(q) is promising for optimizing breeding programmes.

scholarly journals Selection Signatures Underlying Dramatic Male Inflorescence Transformation During Modern Hybrid Maize Breeding

Genetics ◽  
2018 ◽  
Vol 210 (3) ◽  
pp. 1125-1138 ◽  
Author(s):  
Joseph L. Gage ◽  
Michael R. White ◽  
Jode W. Edwards ◽  
Shawn Kaeppler ◽  
Natalia de Leon
Keyword(s):  
Selection Signatures ◽  
Maize Breeding ◽  
Male Inflorescence ◽  
Hybrid Maize

scholarly journals Genetic purity certificate in seeds of hybrid maize using molecular markers

2006 ◽  
Vol 28 (1) ◽  
pp. 169-175 ◽  
Author(s):  
Kalinka Carla Padovani de Carvalho Salgado ◽  
das Graças Guimarães Carvalho Vieira ◽  
Édila Vilela de Resende Von Pinho ◽  
Cláudia Teixeira Guimarães ◽  
Renzo Garcia Von Pinho ◽  
...  
Keyword(s):  
Isocitrate Dehydrogenase ◽  
Female Parent ◽  
Parental Line ◽  
Maize Breeding ◽  
Genetic Purity ◽  
Mendelian Segregation ◽  
Purity Analysis ◽  
Young Leaves ◽  
Parental Lines ◽  
Hybrid Maize

One of the main features that confer high quality to the seed is its genetic purity, in which one of the major causes of contamination is the self-pollination of the female parent. Up to date, there is no accurate and fast methods for detecting such contamination. Thus, this work was carried out to certify the genetic purity in seeds of hybrid maize using different biochemical and DNA-based markers. Two single-cross hybrids and their parental lines derived from the maize breeding program at UFLA were evaluated by isoenzymatic pattern of alcohol dehydrogenase (ADH), esterase (EST), acid phosphatase (ACP), glutamate-oxaloacetate transaminase (GOT), malate dehydrogenase (MDH), isocitrate dehydrogenase (IDH), phosphoglucomutase (PGM), 6-phosphoglucomate dehydrogenase (PGDH), catalase (CAT) and ß-glucosidade (ßGLU) and by microsatellites markers. The enzymatic systems that were able to distinguish the hybrids from their parental line were the catalase, the isocitrate dehydrogenase and the esterase. The esterase showed a Mendelian segregation pattern for UFLA 8/3 hybrid, that enables a safer genetic purity certificate. Microsatellites were able to differentiate the hybrid lines and the respective parental lines. Moreover, this technique was fast, precise and without environment effects. For microsatellites, the amplification pattern was identical when young leaves or seeds were used as DNA source. The possibility of using seeds as DNA source would accelerate and facilitate the role process of the genetic purity analysis.

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