Graduate Thesis Or Dissertation
 

An evaluation of creeping habit in various progenies of red fescue (Festuca rubra L.)

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  • Thirty-three genotypes of red fescue were selected on the basis of diverse origin, anthesis date, and type of spreading from a space-planted introduction nursery. Open-pollinated, single-cross, and top-cross progeny nurseries were established into a randomized block with four replications, 20, 9, 8 entries, respectively, with nine plants per entry on two foot centers. Measured characteristics were plant height, plant width, and seed yield per plant. A polycross progeny row test nursery was established in a randomized block with eight replications in which 17 entries were assigned with rows 10 feet long. Measured characteristics for this progeny test were panicle length, number of branches per panicle, 100-seed weight, 20 panicles seed yield, and seed yield per row. Single-cross and top-cross progenies were compared with their mean open-pollinated progeny performance, respectively. The association between characters for various progeny testing methods was measured by simple correlation coefficients. The creeping type parents resulted in progenies with greater width, height, and seed yield per plant than the non-creeping type when the open-pollinated progeny test was used. Associations between height, width, and seed yield in open-pollinated progeny were positive and significantly correlated with each other. The behavior in the open-pollinated progeny for seed yield was similar to the polycross progeny row test. For these three characters, clonal selection of parents may be effective. In the single-cross progeny, the single-cross between creeping and creeping was greater than any other combination for plant width and seed yield. Frequently there was no significant difference between combinations of crosses and among entries. In the top-cross progeny, the creeping type crossed with the non-creeping tester was the greatest in width and seed yield. For all three characters, the creeping type crossed with the non-creeping tester and the non-creeping type crossed with the creeping tester were greater than any other combination. The open-pollinated progeny of the creeping tester genotype was always greater than the open pollinated progeny of the non-creeping tester genotype. In the comparison of the top-cross with their mean open-pollinated progeny, the behavior of the top-cross progeny was quite different from their mean open-pollinated progeny for all characteristics. The top-cross method was desirable for the study of general and specific combining ability. The study would suggest that genotypes can be quickly identified by using the top-cross progeny test with a non-creeping tester. In the polycross progeny row test the creeping types which came from two isolations were greater than the non-creeping types for all five measured characteristics. Associations between the five characteristics were positive and significantly correlated except the correlation between 100-seed weight and seed yield per row.
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