Item – Theses Canada

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OCLC number
46535029
Author
Stewart, Heather,1951-
Title
Reproductive biology and developmental morphology of Agalinis neoscotica, Scrophulariaceae.
Degree
M. Sc. -- University of Guelph, 1994
Publisher
Ottawa : National Library of Canada = Bibliothèque nationale du Canada, 1994.
Description
2 microfiches.
Notes
Includes bibliographical references.
Abstract
The reproductive biology of Agalinis neoscotica (Scrophulariacea) was studied. Anther dehiscence occurred three days prior to anthesis. Self-compatibility was established using pollinator exclusion and emasculation. Pollen/ovule ratio indicated that A. neoscotica fell within the facultative selfing category. Fluorescence microscopy showed that pollen germination was delayed until six hours after anthesis. Isozyme analysis showed that a moderate amount of selfing occurred; less than expected given the phenology and morphology of the flower. Delayed pollen germination may facilitate out-crossing in A. neoscotica. The comparative developmental morphology of A. neoscotica and A. paupercula var. borealis was studied. Agalinis paupercula var. borealis differed from A. neoscotica in its slow calyx closure and simultaneous stamen initiation. Additional characters that differentiated the two taxa appeared in late development. In A. neoscotica the style and filaments failed to elongate thus causing stigma and anthers to be inserted in the corolla tube. Abaxial anthers failed to rotate on their filaments and the stigma separated into two lobes.
ISBN
0315907258
9780315907256