| 1. |
- Jia, Kai-Hua, et al.
(författare)
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Landscape genomics predicts climate change-related genetic offset for the widespread Platycladus orientalis (Cupressaceae)
- 2020
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Ingår i: Evolutionary Applications. - : John Wiley & Sons. - 1752-4571. ; 13:4, s. 665-676
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Tidskriftsartikel (refereegranskat)abstract
- Understanding and quantifying populations' adaptive genetic variation and their response to climate change are critical to reforestation's seed source selection, forest management decisions, and gene conservation. Landscape genomics combined with geographic and environmental information provide an opportunity to interrogate forest populations' genome-wide variation for understanding the extent to which evolutionary forces shape past and contemporary populations' genetic structure, and identify those populations that may be most at risk under future climate change. Here, we used genotyping by sequencing to generate over 11,000 high-quality variants from Platycladus orientalis range-wide collection to evaluate its diversity and to predict genetic offset under future climate scenarios. Platycladus orientalis is a widespread conifer in China with significant ecological, timber, and medicinal values. We found population structure and evidences of isolation by environment, indicative of adaptation to local conditions. Gradient forest modeling identified temperature-related variables as the most important environmental factors influencing genetic variation and predicted areas with higher risk under future climate change. This study provides an important reference for forest resource management and conservation for P. orientalis.
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| 2. |
- De La Torre, Amanda R., et al.
(författare)
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Adaptation and exogenous selection in a Picea glauca x Picea engelmannii hybrid zone : implications for forest management under climate change
- 2014
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Ingår i: New Phytologist. - Hoboken : Wiley-Blackwell. - 0028-646X .- 1469-8137. ; 201:2, s. 687-699
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Tidskriftsartikel (refereegranskat)abstract
- The nature of selection responsible for the maintenance of the economically and ecologically important Picea glaucaxPicea engelmannii hybrid zone was investigated. Genomic, phenotypic and climatic data were used to test assumptions of hybrid zone maintenance and to model future scenarios under climate change. Genome-wide estimates of admixture based on a panel of 86 candidate gene single nucleotide polymorphisms were combined with long-term quantitative data on growth and survival (over 20yr), as well as one-time assessments of bud burst and bud set phenology, and cold hardiness traits. A total of 15498 individuals were phenotyped for growth and survival. Our results suggest that the P.glaucaxP.engelmannii hybrid zone is maintained by local adaptation to growing season length and snowpack (exogenous selection). Hybrids appeared to be fitter than pure species in intermediate environments, which fits expectations of the bounded hybrid superiority model of hybrid zone maintenance. Adaptive introgression from parental species has probably contributed to increased hybrid fitness in intermediate habitats. While P.engelmannii ancestry is higher than P.glauca ancestry in hybrid populations, on average, selective breeding in managed hybrid populations is shifting genomic composition towards P.glauca, potentially pre-adapting managed populations to warmer climates.
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