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Does drought response change with parental ancestry across a white pine hybrid zone?

Peach, Lulu Rosemary (2021) Does drought response change with parental ancestry across a white pine hybrid zone? Masters thesis, Northern Arizona University.

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Hybrid populations of two white pine species, Pinus strobiformis and Pinus flexilis, are found throughout the southwestern United States. Understanding characteristics of hybrid populations will support efforts to conserve natural genetic diversity as trees adapt to climate change. Using the concept of a “dendrophenotype,” or observed variation in tree-ring size that corresponds to a particular stress event in a tree’s life, we calculated four indices of drought response using tree-ring data from nine hybrid geographic sites across Colorado, New Mexico, Arizona, and Texas. We used these indices in combination with hybrid index values (percentage of Pinus strobiformis ancestry inherited by a single hybrid) for sampled individuals to (1) examine relationships between climate, tree-ring sensitivity, and hybrid index, (2) test for relationships between tree-ring-based drought indices (resistance, recovery, resilience, and a Wet:Dry ratio) and hybrid index, and (3) develop multivariate models that predict drought response based on hybrid index and other variables. We found (1) significant correlation between monsoon index and hybrid index, monsoon index and tree-ring sensitivity, and hybrid index and tree-ring sensitivity in sampled populations, (2) little direct connection between hybrid index and four tree-ring-based drought indices, and (3) no predictive relationship between hybrid index and the drought indices, but stronger relationships may be found using different variables. Validation of a relationship between hybrid index and the annual monsoon cycle points to a future genotype-phenotype analysis that could use existing, fine-scale genetic data to further explore the effects of water availability on the inheritance of adaptive traits in hybrid populations.

Item Type: Thesis (Masters)
Publisher’s Statement: © Copyright is held by the author. Digital access to this material is made possible by the Cline Library, Northern Arizona University. Further transmission, reproduction or presentation of protected items is prohibited except with permission of the author.
Keywords: dendroecology ; dendrophenotype ; forestry ; Pinus flexilis ; Pinus strobiformis ; resilience; White pine; American southwest; Drought
Subjects: S Agriculture > SD Forestry
NAU Depositing Author Academic Status: Student
Department/Unit: Graduate College > Theses and Dissertations
College of the Environment, Forestry, and Natural Sciences > School of Forestry
Date Deposited: 11 Feb 2022 20:52
Last Modified: 11 Feb 2022 20:52
URI: https://openknowledge.nau.edu/id/eprint/5688

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