Vegetative bud development, cone differentiation and development in Picea engelmannii Parry

Simple item page
dc.contributor.authorHarrison, Derek L. S. (Derek Laurie Shawn)en_US
dc.date.accessioned2024-08-14T16:44:50Z
dc.date.available2024-08-14T16:44:50Z
dc.date.copyright1982en_US
dc.date.issued1982
dc.degree.departmentDepartment of Biology
dc.degree.levelMaster of Science M.Sc.en
dc.description.abstractThe microanatomical development of vegetative and reproductive buds in Picea engelmannii Parry (Engelmann spruce) is described. Vegetative buds of Engelmann spruce from the Prince George Forest District (British Columbia) were col­lected and studied. In mid-April growth was resumed as det­ermined from leaf mitoses two weeks later mitotic activity was observed in the apex. Bud-scale initiation began in terminal buds by the end of May. Bud-scale initiation began in axillary buds two weeks later than terminal buds when terminal bud shoot elongation began. Bud-burst occurred in late June and both shoot elongation and bud-scale initiation were complete by late July. In early August terminal vege­tative buds became anatomically differentiated by the initi­ation of leaves. Axillary bud leaf initiation began one week later. In terminal and axillary vegetative buds leaf initiation was completed by late September and buds ceased growth by mid-October. Putative pollen-cones initiated microsporophylls after bud-scale initiation. Two abaxial microsporangia per sporo­phyll were initiated by late August. Microsporangial en­largement began in mid-September and ceased by mid-October. Pollen mother cells did not undergo meiosis before growth cessation. Putative seed-cones initiated bracts directly after bud ­scale initiation. Bract primordia were initiated as a group of darkly staining cells within the peripheral zone. In mid-August, just above these cells another group of darkly staining cells began to develop into the ovuliferous scales. Two developing ovules formed ad axially and on each side of the median longitudinal axis of each ovuliferous scale. These ovules formed one central meg a spore mother cell which enlarged and overwintered in a pre-meiotic stage.
dc.format.extent171 pages
dc.identifier.urihttps://hdl.handle.net/1828/18093
dc.rightsAvailable to the World Wide Weben_US
dc.titleVegetative bud development, cone differentiation and development in Picea engelmannii Parryen_US
dc.typeThesisen_US

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
HARRISON_Derek_Laurie_Shawn_MSC_1982_194677.pdf
Size:
19.83 MB
Format:
Adobe Portable Document Format
Download

Collections

Electronic Theses and Dissertations (ETD)
 
University of Victoria Libraries

We acknowledge and respect the Lək̓ʷəŋən (Songhees and Esquimalt) Peoples on whose territory the university stands, and the Lək̓ʷəŋən and W̱SÁNEĆ Peoples whose historical relationships with the land continue to this day.