Bibliography: leaves 133-157. / xiii, 157, [22] leaves, [31] leaves of plates : ill. (some col.) ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / The principle aim of the work described in this thesis was to use protein engineering to increase the thermostability of barley (1->3,1->4)-B-glucanases / Thesis (Ph.D.)--University of Adelaide, Dept. of Plant Science, 2000

ix, 158 leaves : ill. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Plant Pathology, 1972

Bibliography: leaves: 210-230.

Thesis (Ph. D.)--University of Alberta, 2009. / Title from pdf file main screen (viewed on Jan. 7, 2010). "A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Food Science and Technology, Department of Agricultural, Food and Nutritional Science, University of Alberta." In the title, [beta] is represented by the Greek letter. Includes bibliographical references.

Thesis (doctoral)--Helsinki University of Technology, 2001. / Includes bibliographical references. Also available on the World Wide Web.

In barley, the GPC (Grain Protein Content) has proved to be of great importance for both feed, food and beer production. When it comes to feed and food, a high GPC is desirable since it indicates good nutritional values, while in beer production a low and stable GPC is needed to avoid beer chill haze. In previous studies a decrease in the GPC has been seen in different accessions of barley developed at different time periods during the last 100 years. The gene family HvNAM, including the genes HvNAM1 and HvNAM2, has in previous studies been shown to be important for the remobilization of nutrients towards the grains during the senescence and thus also for the GPC. In this study, 40 Nordic accessions from different improvement groups from the end of the 19th century until today have been analyzed for polymorphism in those genes. Statistical analyses has been conducted to investigate if there are any associations between the polymorph nucleotide positions and the nutritional values of grain protein, iron and zinc contents. However, no such associations were found. Instead some correlations could be seen between the nutrient content and thousand grain weight, a relative measurement of the grain size. In conclusion, since no polymorphisms were found to be associated to the nutritional value there might instead be a correlation between the gene expression and the nutritional value. Future work should thus focus on the gene expression of HvNAM1 and HvNAM2 in Nordic accessions of barley.

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Agronomists are constantly experimenting with improved plot techniques that can enable them to make more precise inferences from field data. This dissertation reports two investigations: (a)evaluation of the yield potentials of some barley genotypes using two non-traditional methods, and (b)comparative assessment of the two methods. Two separate but related experiments were conducted. The nearest neighbor procedure was the first. The use of spaced-plant parameters to predict yield at normal commercial density was the second experiment. Four variations of the nearest neighbor procedure were examined. For each version the plant to be evaluated always occupied the center of the rectangle of nearest neighbors. Evaluation consisted of yield adjustments where the yield of the individual plot was compared with the mean of its nearest-neighbor genotypes. Individuals were ranked according to those deviations. Unadjusted yield data were also ranked. The error mean squares derived from ranks of various configurations were compared inter se and with that from unadjusted yield. Nearest neighbors always showed a smaller error variance than the unadjusted data. Of these the first nearest neighbors produced the smallest mean square for error and, hence, the highest efficiency of genotype ranking. This procedure substantially controlled for the effects of soil heterogeneity. Averages of individual ranks were computed and related to respective genotypes (entries). For each procedure the top 25% which fell in the upper bracket of the yield curve were considered to possess high yield potentials. This method of adjustment, ranking, averaging, and selection was applied to the unadjusted data as well as to each of the nearest neighbor procedures. Unadjusted mean yield and nearest neighbor techniques were contrasted. The rankings generated by the two procedures were similar but not identical. The significantly lower error variance of the nearest neighbor adjustments indicated that those should be used instead of unadjusted mean yield when precision is needed. However, unadjusted mean yield ranking provides broad identification of high yielding genotypes, and is a simpler statistical procedure. The second experiment examined the effectiveness of yield and yield components of spaced plants in predicting yield at normal cultural density. It was conducted for two years using primarily trend analysis. Results for individual years showed that none of the metric components of spaced plants was a satisfactory predictor of crop yield. However, when data were pooled over the whole experimental period, most of the yield components of spaced plants showed highly significant correlations with crop yield. Regression models were developed from the components which demonstrated good prediction of crop yield. Under the conditions of this study, productivity (biological yield or total weight) was revealed by all the analyses as the most important spaced-plant component for predicting yield at higher densities.

Possible maintainer lines were selected from CC XXXII and crossed onto cytoplasmically male-sterile plants. Complete male sterility was maintained in both the F₁ and BC₁ generations of 46.4% of the lines. Four cultivars with maintainer genotypes that were in both normal and msm1 cytoplasm were intercrossed using the male-sterile forms as the female parents. All F₁'s were completely male-sterile. Restoration of male fertility by 22 lines selected from CC XXXII was shown in each case to be due to a single dominant gene. In some lines, restoration was influenced by environment and genetic background. Partial restoration was observed in cultivars in the World Collection and lines selected from CC XXXII. Partial restoration appeared to be due to several genes that were subject to environmental influence. Accumulation of some of these genes increased the amount of restoration. There was no evidence that cytoplasmic factors were passed through the pollen. Twenty-two F₁ hybrids were produced by crossing restorer lines onto male-sterile msm1 lines. The 22 hybrids, their 44 parental restorer and maintainer lines and six check cultivars were grown in a four-replication yield trial. Total yield, 1000-seed weight and hectaliter weight were measured for each plot. All the F₁ hybrids outyielded their midparent values and 17 of the hybrids outyielded their high parents. Half of the F₁'s outyielded the high check cultivar, which yielded about 9,130 kg/ha. Twenty-one F₁'s had greater 1000-seed weights than their midparent values while only 11 F₁'s had greater 1000-seed weights than their high parents. The high check cultivar had the greatest 1000-seed weight, 49.0 gm. The hybrids with the greatest 1000-seed weights were not the hybrids with the greatest yields. Eighteen of the F₁'s had greater hectaliter weights than the midparent values, but only seven had greater hectaliter weights than their high parents. The high check cultivar had the greatest hectaliter weight, 75 kg. The hybrids with the greatest hectaliter weights were not the highest yielding hybrids.

No description available.