Effects of environmental conditions and the fatuoid character on the naked trait in oat were investigated. Each of three genotypes responded differently to 2,4-D and 2,4-D increased hull content in some genotypes. In field experiments, there was usually a higher hull content in samples grown in a cool year than in a warmer year, but in growth cabinets, there was no consistent response to temperature treatments. Groats of hulled grains were smaller than groats of naked grains. Among field grown samples there was an association between the proportion by weight of hull tissue in grain and the frequency of hulled grains. With gentle threshing in one of two crosses, the naked versus hulled character fit a 3:1 ratio, i.e., 3 plants with naked grain or both hulled and naked grain:1 plant with only hulled grain. With vigorous threshing the 3:1 ratio did not fit in either cross. The awned character of the fatuoid condition displayed monogenic inheritance according to a codominant-gene model where the expression of the heterozygote was variable. Expression of the fatuoid character was more variable for F2:3 families derived from naked F2 plants than for F2:3 families derived from hulled F2 plants. F2 and F2:3 plants with two or more awns per spikelet produced higher proportions of naked grain than F2 plants with fewer than two awns per spikelet. In most immature florets of fatuoid plants a row of small cells at the articulation zone was observed. This row of small cells acts as an abscission layer in grains of hulled-grained fatuoid plants but not in grains of naked-grained fatuoid plants.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.35709 |
| Date | January 1998 |
| Creators | Hoekstra, Gert Jan. |
| Contributors | Mather, D. E. (advisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Doctor of Philosophy (Department of Plant Science.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001657429, proquestno: NQ50185, Theses scanned by UMI/ProQuest. |
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