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  • 1
    Electronic Resource
    Electronic Resource
    Correlated response to recurrent selection for groat-oil content in oats (1989)
    Springer
    Euphytica 43 (1989), S. 21-28 
    Details
    ISSN: 1573-5060
    Keywords: Avena sativa L. ; Avena sterilis L. ; introgression ; phenotypic recurrent selection ; oil yield ; correlated response
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary One hundred random oat (Avena sativa L.) lines from a base (C0) and each of three populations (C1, C2, and C3) improved for groat (caryopsis) oil content by phenotypic recurrent selection were evaluated for correlated changes in several unselected agronomic traits. In addition, the parents of the base population and four check varieties were evaluated for the same traits. Phenotypic recurrent selection for high groat-oil content resulted in no significant correlated response in mean expression of any trait. Mean grain yield, biomass, groat yield, and harvest index of the improved populations were equal or superior to the mean of the parents and, with the exception of harvest index, equivalent to the mean of the check varieties. Mean test weight and seed weight of all populations were lower than for parents or check varieties. Selection for high groat-oil content caused a decline in genotypic variance for test weight and groat fraction, but reductions in genotypic variance for heading date and plant height may have resulted from culling for good agronomic type. Broad-sense heritability remained moderate to high for all traits except groat fraction. Phenotypic and genotypic correlation coefficients revealed negative, though mostly nonsignificant, relationships between groat-oil content and several traits, which may reflect a purported bioenergetic limitation to increasing groat-oil content in oats. Oil yield, however, was positively correlated with grain and groat yield, groat fraction, biomass, and harvest index. Results suggest that development of high-oil oat cultivars with current levels of production traits via phenotypic recurrent selection is possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00037892
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  • 2
    Electronic Resource
    Electronic Resource
    Compositional stability of an oat multiline (1982)
    Springer
    Euphytica 31 (1982), S. 33-40 
    Details
    ISSN: 1573-5060
    Keywords: Avena sativa L. ; oats ; multiline ; compositional stability ; blend ; near-isogenic lines ; competitive ability ; Puccinia coronata ; crown rust
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Mixtures of genotypes are frequently unstable in composition when propagated over succesive generations. This study was designed to test whether a multiline cultivar of oats (Avena sativa L.) created to control crown rust disease (caused by Puccinia coronata Cda.) would reflect differential near-isogenic line survivals when propagated under conditions of either presence or absence of rust. An oat multiline cultivar synthesized from near-isogenic lines that had different genes for resistance to crown rust was propagated under rust-free and rust epiphytotic conditions for four successive generations. In the rust-free environment, one near-isogenic line. CI 9192, which was inferior in yielding ability, was reduced significantly from 20% to 10% of the mixture, and CI 9184, which has no yield deviation from normal, increased from 20% to 38%. The other three near-isogenic lines were stable at about 20%. Also, in the rust line of descent. CI 9192 and CI 9184, respectively, decreased and increased significantly. Our results have implications with respect to seed production practices for multiline cultivars: they also raise the question of whether a multiline is stable enough in composition to be called a cultivar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00028304
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  • 3
    Electronic Resource
    Electronic Resource
    Growth analyses of oat lines with low and high groat-oil content (1991)
    Springer
    Euphytica 54 (1991), S. 221-229 
    Details
    ISSN: 1573-5060
    Keywords: Avena sativa L. ; groat-oil content ; growth analysis ; oat ; phenotypic recurrent selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A considerable increase in groat-oil content of oat (Avena sativa L.) has been accomplished recently. The objective of this study was to determine whether physiological traits of oat plants with high groat-oil content are changed in a way that would provide the energy needed for increased groat-oil content. Growth analyses were conducted in 1987 and 1988 on 25 oat lines with low and on 25 with high groat-oil content. Three harvests were made in 1987 and six in 1988. Plot biomass, plant weight, leaf area, and leaf weight were measured at each harvest and estimates for relative crop growth rate, unit leaf area, leaf area ratio, specific leaf area, and leaf weight ratio were derived. Grain yield, groat-oil content, and groat-protein content were measured at maturity. The data were analysed by using the stepwise multivariate analysis of variance technique. The results suggest that changes in growth characteristics and increases in photosynthetic capacity provide the extra bioenergy required for synthesis of more groat oil. The groat-protein content did not change as a result of increased groat-oil content in oat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00022997
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  • 4
    Electronic Resource
    Electronic Resource
    Changes in fatty acid composition associated with recurrent selection for groat-oil content in oat (1991)
    Springer
    Euphytica 56 (1991), S. 81-88 
    Details
    ISSN: 1573-5060
    Keywords: Avena sativa L. ; fatty acid composition ; groat-oil content ; recurrent selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Groat oil of oat (Avena sativa L.) is a well-balanced oil with respect to saturated, monounsaturated, and polyunsaturated fatty acids. In this study, we measured the effect of six cycles of recurrent selection for high groat-oil content on the fatty acid composition of the groat oil. From each cycle of selection, 50 oat lines were grown in a replicated field experiment at two sites and were evaluated for groat-oil content and fatty acid composition. Concentrations of palmitate and linolenate decreased moderately over cycles of selection, whereas stearate content increased. A major increase occurred in the content of oleate and a major decrease in linoleate. Most of the modification of fatty acid composition took place within the saturated and unsaturated classes. The ratio of unsaturated to saturated fatty acids increased over cycles of selection. Significant genetic variation was present for each fatty acid, indicating that selection for different desired fatty acid compositions in groat oil of oat should be possible in this population.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00041747
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