Satellite Symposium 5: Molecular Breeding
Description
Plant breeders are concerned with the diversity among and within breeding populations, because it largely determines the future prospects of success in breeding programs. DNA markers provide a powerful tool for the assessment of genetic diversity. The relationship between genetic diversity and heterosis has been investigated in several species (Melchinger, 1999). In hybrid breeding programs divergent genepools have been established in the past, according to heterotic patterns based on testcross information. In the last decade it has been shown, that new breeding materials can be assigned to already existing gene pools using molecular markers. The phenomenon of heterosis has been of interest in grass breeding research for a long time, and the occurrence of heterosis has been demonstrated for particular crosses (review in Posselt, 2003). However, no attempts have been made to group perennial ryegrass populations according to diversity measures. So far, breeders have mostly combined diverse materials into a base population and applied intra-population improvement. Accidently, heterosis was captured in the new variety. For more reliable exploitation of heterosis in grasses, divergent genepools have to be established.
Citation
Posselt, U. K., "Genetic Diversity and Heterosis in Perennial Ryegrass" (2023). IGC Proceedings (1997-2023). 143.
https://uknowledge.uky.edu/igc/20/satellitesymposium5/143
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Genetic Diversity and Heterosis in Perennial Ryegrass
Plant breeders are concerned with the diversity among and within breeding populations, because it largely determines the future prospects of success in breeding programs. DNA markers provide a powerful tool for the assessment of genetic diversity. The relationship between genetic diversity and heterosis has been investigated in several species (Melchinger, 1999). In hybrid breeding programs divergent genepools have been established in the past, according to heterotic patterns based on testcross information. In the last decade it has been shown, that new breeding materials can be assigned to already existing gene pools using molecular markers. The phenomenon of heterosis has been of interest in grass breeding research for a long time, and the occurrence of heterosis has been demonstrated for particular crosses (review in Posselt, 2003). However, no attempts have been made to group perennial ryegrass populations according to diversity measures. So far, breeders have mostly combined diverse materials into a base population and applied intra-population improvement. Accidently, heterosis was captured in the new variety. For more reliable exploitation of heterosis in grasses, divergent genepools have to be established.
