Systematics/Phytogeography / Taxonomie/ Section
Levings, K. , Barber, Valerie , Dawe, Janice C. .
A Preliminary Anatomical Study of Hybrid Betula in Alaska.
The species of Betula are notorious hybridizers, and it is sometimes difficult to distinguish between parent and hybrid before reproductive maturity without chromosome work. A study in 1912 indicated an anatomical similarity of a B. lentahybrid to Alnus although, to all outward appearances, the hybrid and its parent were identical until reproductive maturity. Studies have also shown that principal components analysis can be used to indicate possible hybrid parents. The goal of this study was to see if wood anatomy would be enough to distinguish the hybrids from their parents. Betula wood from 16 stands was collected south of the Alaska Range, and slides were requested from various herbaria. A sample of Alnus was also collected to serve as an outgroup. Alaska specimens and herbarium slides were studied using a compound light microscope and a confocal laser microscope, and macerated tissues from the Alaska specimens were examined using SEM. Measurements were taken using Image J, and PCA was executed using NTSYS-pc. Results were surprising when comparing Betula and Alnus from the lower 48 to species in Alaska and when comparing Alaskan Betula to Alnus.
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1 - University of Alaska-Fairbanks, Forest Sciences, School of Natural Resources and Agricultural Sciences, PO Box 757200, 303 O\'Neill, Fairbanks, AK, 99775-7200
2 - University of Alaska-Fairbanks, Sitka Forest Products Program, School of Natural Resources and Agricultural Sciences, P. O. Box 6410, Sitka, AK, 99835, USA
3 - University of Alaska-Fairbanks, Forest Sciences, School of Natural Resources and Agricultural Sciences, P. O. Box 757200, 303 O'Neill, Fairbanks, AK, 99775-7200, USA
Presentation Type: Poster:Posters for Sections
Location: Ball Room & Party Room/SUB
Date: Monday, July 28th, 2008
Time: 12:30 PM