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Evaluation and genetic analysis of tall fescue genotypes for summer stress tolerance
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Cross, James W.. Evaluation and genetic analysis of tall fescue genotypes for summer stress tolerance. Retrieved from https://doi.org/doi:10.7282/T3S46QN3

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TitleEvaluation and genetic analysis of tall fescue genotypes for summer stress tolerance
NameCross, James W. (author); Meyer, William A (chair); Bonos, Stacy (internal member); Huang, Bingru (internal member); Rutgers University; Graduate School - New Brunswick
Date Created2013
Other Date2013-01 (degree)
SubjectPlant Biology, Tall fescue--Effect of drought on, Turf management
Extentxii, 104 p. : ill.
DescriptionDuring summer months, overall turf quality of cool-season turfgrasses commonly deteriorates significantly. This loss in turf quality can mainly be attributed to the combination of high temperatures and low soil moisture. The combination of these two stresses is commonly referred to as “summer stress”. Tall fescue (Lolium arundinacea [Schreb.] Darbysh) exhibits substantial variation in performance under summer stress between genotypes. The objectives of this thesis were to [1] evaluate diverse tall fescue genotypes being subjected to heat, drought, and/or combinations of both stresses growing in a growth chamber, rainout shelter, and under field conditions, and [2] evaluate progeny of a full diallel cross and polycross block made with tall fescues exhibiting different degrees of summer stress tolerance. Twenty-four experimental tall fescue genotypes, twelve summer stress tolerant and twelve summer stress sensitive, were selected for evaluation while growing under field conditions during the summer of 2010 at the Rutgers Agricultural Experiment Station located in Adelphia, NJ. A growth chamber study subjected these genotypes to heat and drought stress alone and in combination. The performance of genotypes in the heat stress treatment was similar to the performance of the genotypes under field conditions, however summer stress tolerant genotypes did not perform significantly better in the drought or heat + drought treatments. Mowed space-plants of these 24 genotypes were evaluated while growing in an automatic rainout shelter structure over two years. Genotypes selected as summer stress tolerant had higher quality ratings than the summer stress sensitive group. Additionally, quality ratings in the rainout shelter were moderately correlated with quality ratings in the heat stress growth chamber. A full diallel cross and a polycross block were used to estimate narrow-sense heritability values of 0.66 and 0.48, respectively. Heterosis was found to be significant in 40% of the diallel crosses. Data from the diallel and polycross block indicate breeding for enhanced summer stress tolerance in tall fescue would result in 52% and 32% improvements per selection cycle, respectively, when making recurrent selections of the top 5% of the population.
NoteM.S.
NoteIncludes bibliographical references
Noteby James W. Cross
Genretheses, ETD graduate
Persistent URLhttps://doi.org/doi:10.7282/T3S46QN3
Languageeng
CollectionGraduate School - New Brunswick Electronic Theses and Dissertations
Organization NameRutgers, The State University of New Jersey
RightsThe author owns the copyright to this work.
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