scholarly journals How to achieve a higher selection plateau in forest tree breeding? Fostering heterozygote × homozygote relationships in optimal contribution selection in the case study of Populus nigra

2021 ◽  
Author(s):  
Mathieu Tiret ◽  
Marie Pégard ◽  
Leopoldo Sánchez
Keyword(s):  
Tree Breeding ◽  
Forest Tree ◽  
Populus Nigra ◽  
Forest Tree Breeding

Evaluation of forest tree breeding strategies based on partial pedigree reconstruction through simulations: Pinus pinaster and Eucalyptus nitens as case studies

2019 ◽  
Vol 49 (12) ◽  
pp. 1504-1515 ◽  
Author(s):  
Laurent Bouffier ◽  
Jaroslav Klápště ◽  
Mari Suontama ◽  
Heidi S. Dungey ◽  
Tim J. Mullin
Keyword(s):  
Pinus Pinaster ◽  
Tree Breeding ◽  
Forest Tree ◽  
Breeding Strategy ◽  
Pedigree Reconstruction ◽  
Eucalyptus Nitens ◽  
Forest Tree Breeding ◽  
Breeding Cycles ◽  
Breeding Programmes

Despite recent developments in molecular markers, most forest tree breeding programmes do not use them routinely. One way to integrate markers would be to use them for pedigree reconstruction after a simplified mating design through polymix or open-pollinated breeding. Thanks to the latest developments in the POPSIM simulator, various breeding strategies, including some based on paternity recovery, were evaluated with specified constraints on the level of diversity over breeding cycles. These simulations were carried out in two case studies: the French Pinus pinaster (Ait.) and the New Zealand Eucalyptus nitens (H. Dean & Maiden) Maiden breeding programmes. The Pinus pinaster case study produced lower genetic gain for the polymix breeding strategy with paternity recovery compared with double-pair mating or optimal-contribution strategies. However, the polymix breeding strategy could be of interest if the mating design is faster to complete. In the Eucalyptus nitens case study, pedigree recovery was shown to be a mandatory step to controlling the erosion of diversity over breeding cycles. In both cases, the strategies based on pedigree reconstruction were applicable with a limited level of genotyping. Finally, these simulations allow some general recommendations to be drawn to help breeders when designing a strategy for forest tree breeding.

Simulation of hybrid forest tree breeding strategies

2004 ◽  
Vol 34 (1) ◽  
pp. 195-208 ◽  
Author(s):  
R J Kerr ◽  
M J Dieters ◽  
B Tier ◽  
H S Dungey
Keyword(s):  
Recurrent Selection ◽  
Parental Species ◽  
Tree Breeding ◽  
Forest Tree ◽  
Alternative Methods ◽  
Breeding Strategies ◽  
Reciprocal Recurrent Selection ◽  
Forest Tree Breeding ◽  
Forward Selection ◽  
Pure Species

Computer simulation is the only realistic method of evaluating alternative methods of breeding hybrid forest trees. Empirical tests would be very long term and expensive. This paper describes the development of a simulation program, called XSIM, which generates two different but closely related outcrossing tree species. The genetic correlation between performance in each parental species and performance in the resulting hybrid can be set, in addition to the amounts and types of variances in each parental species. The breeding strategies available for testing include conventional reciprocal recurrent selection, reciprocal recurrent selection with forward selection, recurrent selection within each pure species, and the creation of a synthetic species. XSIM allows the strategies to be compared using the same base populations, equivalent selection intensities, and comparable mating patterns. Innovative best linear unbiased prediction procedures allow all ancestral and current progeny generation data, from both parental species and the hybrid, to be analysed together. The theoretical basis for the simulation is given, and genetic and statistical models are described. In summary, XSIM allows rigorous comparisons of the strategies in terms of genetic gain per time and provides useful insight into hybrid forest tree breeding.

Sign in / Sign up

Export Citation Format

Share Document