期刊
MOLECULAR ECOLOGY
卷 22, 期 5, 页码 1214-1230出版社
WILEY
DOI: 10.1111/mec.12067
关键词
association mapping; boreal forest tree; ecological genomics; heritability; population structure
资金
- Alaska EPSCoR (NSF) [EPS-0701898]
- state of Alaska
- National Science Foundation Plant Genome Research Program [DBI-0701911, 1137001]
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [1137001] Funding Source: National Science Foundation
The manner in which organisms adapt to climate change informs a broader understanding of the evolution of biodiversity as well as conservation and mitigation plans. We apply common garden and association mapping approaches to quantify genetic variance and identify loci affecting bud flush and bud set, traits that define a tree's season for height growth, in the boreal forest tree Populus balsamifera L. (balsam poplar). Using data from 478 genotypes grown in each of two common gardens, one near the southern edge and another near the northern edge of P.balsamifera's range, we found that broad-sense heritability for bud flush and bud set was generally high (H2>0.5 in most cases), suggesting that abundant genetic variation exists for phenological response to changes in the length of the growing season. To identify the molecular genetic basis of this variation, we genotyped trees for 346 candidate single nucleotide polymorphisms (SNPs) from 27 candidate genes for the CO/FT pathway in poplar. Mixed-model analyses of variance identified SNPs in 10 genes to be associated with variation in either bud flush or bud set. Multiple SNPs within FRIGIDA were associated with bud flush, whereas multiple SNPs in LEAFY and GIGANTEA 5 were associated with bud set. Although there was strong population structure in stem phenology, the geographic distribution of multilocus association SNP genotypes was widespread except at the most northern populations, indicating that geographic regions may harbour sufficient diversity in functional genes to facilitate adaption to future climatic conditions in many sites.
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