2023
DOI: 10.1093/aobpla/plad008
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Differences in heat tolerance, water use efficiency and growth among Douglas-fir families and varieties evidenced by GWAS and common garden studies

Abstract: Severe and frequent heat and drought events challenge the survival and development of long-generation trees. In this study, we investigated the genomic basis of heat tolerance, water use efficiency, and growth by performing genome-wide association studies in coastal Douglas-fir (Pseudotsuga menziesii) and intervarietal (menziesii x glauca) hybrid seedlings. GWAS results identified 32 candidate genes involved in primary and secondary metabolism, abiotic stress and signaling, among other functions. Water use eff… Show more

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Cited by 7 publications
(6 citation statements)
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“…glauca populations into var. menziesii populations in dry locations, or the use of inter‐varietal hybrids could be an alternative approach (Compton et al ., 2023), but the large difference in growth potential between varieties and the potential for maladaptation to other biotic and abiotic factors (Pickles et al ., 2015) still require further testing.…”
Section: Discussionmentioning
confidence: 99%
“…glauca populations into var. menziesii populations in dry locations, or the use of inter‐varietal hybrids could be an alternative approach (Compton et al ., 2023), but the large difference in growth potential between varieties and the potential for maladaptation to other biotic and abiotic factors (Pickles et al ., 2015) still require further testing.…”
Section: Discussionmentioning
confidence: 99%
“…Conifers, being wind pollinated species, may be susceptible to elevational differences between populations [51]. Douglas-fir grows from sea level to over 3000 m of elevation with northern interior populations growing at the highest altitude [52,8]. Hybrids grow at intermediate elevations between northern coastal and northern interior populations which may explain the higher ancestry of the interior north variety as gene flow from the coastal populations is limited due to the elevational gradient.…”
Section: Discussionmentioning
confidence: 99%
“…Samples were genotyped using a custom-designed gene-based Illumina Infinium SNP array containing 16,146 Douglas-fir single nucleotide polymorphisms (SNPs) at the University of California-Davis Genome Center. This array was designed to represent genome-wide variation in the species by using 10X whole-genome re-sequencing data from individuals across the species' geographic range as input for array construction [7,8]. Genotypes were called using Illumina's Genome Studio Genotyping Module v 2.0.5 (Illumina, 2016).…”
Section: Snp Genotyping and Filteringmentioning
confidence: 99%
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