Experiments were conducted to assess the variation for resistance to Fusarium graminearum ear rot among selfed lines from the Zapalote Chico corn population. It was already known that Zapalote Chico possesses some resistance to corn earworm (Heliothis zeae) and variation in Fusarium graminearum ear rot symptom severity had been observed within the population. During two years of experiments, 47 S4- and S5-generation lines were inoculated and ear rot severity was assessed. In addition, eight pigmentation traits and eight morphological traits were recorded. Lines showed significant differences for all recorded traits. Associations were not strong among morphological traits, but were fairly strong among pigmentation traits. Ear rot symptom severity did not seem to be associated with any other trait. The source population and inbred lines exhibited broad ranges of variation and similar bimodal distributions of ear rot symptom severity ratings. Despite significant differences among lines within experiments none of the lines showed distinct and consistent resistance over two years of experiments. It seems that Zapalote Chico lines do not have environmental stability and sufficient potential to be considered worthwhile source of resistance for ear rot.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.27538 |
| Date | January 1997 |
| Creators | Krsikapa, Nenad. |
| 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 | Master of Science (Department of Plant Science.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001618534, proquestno: MQ37137, Theses scanned by UMI/ProQuest. |
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