Acknowledgments
We thank the Forest Service’s Pacific Southwest Regional Genetic Resources Program for allowing us to sample needles and collect seeds from their seed orchard, and XSEDE and UC Merced computer cluster for computational resources and support. We thank David Neale, Stephen Hart, Jason Sexton, Jeffrey Lauder, Dean Wu, and Rainbow DeSilva for their comments on the manuscript and the experimental design. Also, thank Vanessa Centeno and Shirley Calderon at UC Merced for greenhouse plant care. The sequencing was carried out at the DNA Technologies and Expression Analysis Cores at the UC Davis Genome Center, supported by NIH Shared Instrumentation Grant 1S10OD010786-01. For SNP identification, we used the MERCED computer cluster at UC Merced (funded by NSF Award ACI-1429783) and the Extreme Science and Engineering Discovery Environment (XSEDE, supported by NSF Award ACI-1548562). The funding organizations paid the experimental fees and computing resources for this research. Still, they did not play any role in the design of the study nor the collection analysis and interpretation of data, or the writing of the manuscript.