Temperature x genotype effects for perloline, crude protein and total water soluble carbohydrate levels in tall fescue (Festuca arundinacea, Schreb.) Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/nk322h545

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  • Perloline levels have been associated with poor animal performance on tall fescue pastures. Animal performance is low when perloline levels are high. High perloline levels are reported during hot, dry weather and increased N fertilization. Tall fescue perloline levels appear to be affected by genetic and environmental differences. Positive associations between perloline and protein have been reported and negative associations between protein and water soluble carbohydrate (WSC) levels were also observed. Crude protein and WSC are factors also affected by environmental changes. A study of relationships between these factors will help properly assess forage quality in tall fescue. Four tall fescue genotypes were placed at random in control climate chambers with 12-hour light periods, at 15°, 20°, and 30°C. Forage harvests were taken at three 28-day intervals and analysed for perloline, crude protein and WSC. Significant genotype x temperature interactions for all of the measured components were observed. Averaged over genotypes, there was generally an increase in perloline and crude protein and a decrease in WSC with increasing temperature. Correlation coefficients, within genotypes, among levels of components, indicate that perloline is positively associated with crude protein. This association, however, was statistically significant for only one genotype. Also, only one genotype exhibited a significant association between crude protein and WSC, although crude protein and WSC are negatively associated. Associations between perloline and WSC were also negative but not statistically significant. The results indicate that genotype selection for quality components is feasible. Genotype screening at different temperatures may be an important procedure in the identification of parent genotypes in a tall fescue quality improvement program. Selection for material with the genetic potential for low of high perloline level can be accomplished at high temperatures, near 30°C, while selection for crude protein and WSC should be done at lower temperatures, from 15° - 20°C.
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