Publication Date
1997
Description
Seedling root fluorescence has generally been used to discriminate perennial ryegrass (Lolium perenne L.) from Italian ryegrass (L. multiflorum Lam.). The trait, however, has introgressed between the two species and breeders now determine fluorescence levels for new ryegrass cultivars. Our objective was to ascertain genetic change for fluorescence expression during generations of seed multiplication. Four ryegrass populations, differing in fluorescence levels, were increased three generations at each of three Oregon locations. Fluorescence levels were measured for each generation cycle at each location. Variation was present for fluorescence among locations within populations and for seed production generation within locations. One population, for example, initially at 10% fluorescence increased to 36% over three generations of seed multiplication at one location, but decreased to 8 and 2% at the other two locations. This large effect of location and seed generation on fluorescence expression must be examined and carefully considered when describing fluorescence levels of cultivars for seed certification.
Citation
Floyd, D J. and Barker, R E., "Genetic Shift of Seedling Fluorescence in Ryegrass Over Seed Increase Generations" (2024). IGC Proceedings (1989-2023). 24.
https://uknowledge.uky.edu/igc/1997/session24/24
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Genetic Shift of Seedling Fluorescence in Ryegrass Over Seed Increase Generations
Seedling root fluorescence has generally been used to discriminate perennial ryegrass (Lolium perenne L.) from Italian ryegrass (L. multiflorum Lam.). The trait, however, has introgressed between the two species and breeders now determine fluorescence levels for new ryegrass cultivars. Our objective was to ascertain genetic change for fluorescence expression during generations of seed multiplication. Four ryegrass populations, differing in fluorescence levels, were increased three generations at each of three Oregon locations. Fluorescence levels were measured for each generation cycle at each location. Variation was present for fluorescence among locations within populations and for seed production generation within locations. One population, for example, initially at 10% fluorescence increased to 36% over three generations of seed multiplication at one location, but decreased to 8 and 2% at the other two locations. This large effect of location and seed generation on fluorescence expression must be examined and carefully considered when describing fluorescence levels of cultivars for seed certification.
