Pollen biology of Picea glauca (Moench) Voss

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dc.contributor.authorDawkins, Margaret D.en_US
dc.date.accessioned2024-08-13T20:16:04Z
dc.date.available2024-08-13T20:16:04Z
dc.date.copyright1990en_US
dc.date.issued1990
dc.degree.departmentDepartment of Biology
dc.degree.levelMaster of Science M.Sc.en
dc.description.abstractPollen development, pollen forcing, pollen germination and pollen tube growth were examined in Picea glauca (Moench) Voss. Pollen development was studied from breaking of dormancy in mid-February to dehiscence. The effects of forcing were studied by comparing development and quality of pollen from potted grafts grown in a heated greenhouse or at ambient temperature. It was found that although forcing increased the rate of pollen development, it also decreased sucrose levels in cones containing 5-cell pollen and decreased the ability of the pollen to produce seed. Abnormal pollen was found in both force and control treatments. Pollen hydration, germination and tube growth were studied in vivo and in. vitro. Events were similar during hydration and germination, although pollen germinated faster in liquid medium than in the ovule. Differences in starch accumulation of body cell plastids and in pollen tube zonation became apparent in early stages of pollen tube growth. A penetration peg was formed in vivo when the pollen tube contacted nucellar cells. Projections formed by the tube tips appeared to penetrate between nucellar cells, resulting in a branched pollen tube. Plasmatubules were found at and near the pollen tube tip, and are thought to be involved in nutrient absorption. The stalk cell separated from the corpus of the pollen and moved in advance of the body cell into the pollen tube. Stalk and body cells remained within the corpus of the pollen in vitro.
dc.format.extent136 pages
dc.identifier.urihttps://hdl.handle.net/1828/17624
dc.rightsAvailable to the World Wide Weben_US
dc.titlePollen biology of Picea glauca (Moench) Vossen_US
dc.typeThesisen_US

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