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Michelson, Ingrid H.
Publications (2 of 2) Show all publications
Wang, J., Ding, J., Tan, B., Robinson, K. M., Michelson, I. H., Johansson, A., . . . Ingvarsson, P. K. (2018). A major locus controls local adaptation and adaptive life history variation in a perennial plant. Genome Biology, 19, Article ID 72.
Open this publication in new window or tab >>A major locus controls local adaptation and adaptive life history variation in a perennial plant
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2018 (English)In: Genome Biology, ISSN 1465-6906, E-ISSN 1474-760X, Vol. 19, article id 72Article in journal (Refereed) Published
Abstract [en]

Background: The initiation of growth cessation and dormancy represent critical life history trade offs between survival and growth and have important fitness effects in perennial plants Such adaptive life history traits often show strong local adaptation along environmental gradients but, despite then importance, the genetic architecture of these traits remains poorly understood.

Results: We integrate whole genome re sequencing with environmental and phenotypic data from common garden experiments to investigate the genomic basis of local adaptation across a latitudinal gradient in European aspen (Populus tremula). A single genomic region containing the PtFT2 gene mediates local adaptation in the timing of bud set and explains 65% of the observed genetic variation in bud set This locus is the likely target of a recent selective sweep that originated right before or during colonization of northern Scandinavia following the last glaciation Field and greenhouse experiments confirm that variation in PtFT2 gene expression affects the phenotypic variation in bud set that we observe in wild natural populations.

Conclusions: Our results reveal a major effect locus that determines the timing of bud set and that has facilitated rapid adaptation to shorter growing seasons and colder climates in European aspen. The discovery of a single locus explaining a substantial fraction of the variation in a key life-history trait is remarkable, given that such traits are generally considered to be highly polygenic. These findings provide a dramatic illustration of how loci of large effect for adaptive traits can arise and be maintained over large geographical scales in natural populations.

Place, publisher, year, edition, pages
BioMed Central, 2018
Populus tremula, Local adaptation, Genomic basis, PtFT2, Adaptive traits, Selective sweep
National Category
urn:nbn:se:umu:diva-150175 (URN)10.1186/s13059-018-1444-y (DOI)000434210500001 ()29866176 (PubMedID)
Swedish Research CouncilKnut and Alice Wallenberg Foundation

Originally included in thesis in manuscript form.

Available from: 2018-07-18 Created: 2018-07-18 Last updated: 2018-08-14Bibliographically approved
Michelson, I. H., Ingvarsson, P. K., Robinson, K. M., Edlund, E., Eriksson, M. E., Nilsson, O. & Jansson, S. (2018). Autumn senescence in aspen is not triggered by day length. Physiologia Plantarum: An International Journal for Plant Biology, 162(1), 123-134
Open this publication in new window or tab >>Autumn senescence in aspen is not triggered by day length
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2018 (English)In: Physiologia Plantarum: An International Journal for Plant Biology, ISSN 0031-9317, E-ISSN 1399-3054, Vol. 162, no 1, p. 123-134Article in journal (Refereed) Published
Abstract [en]

Autumn senescence in mature aspens, grown under natural conditions, is initiated at almost the same date every year. The mechanism of such precise timing is not understood but we have previously shown that the signal must be derived from light. We studied variation in bud set and autumn senescence in a collection of 116 natural Eurasian aspen (Populus tremula) genotypes, from 12 populations in Sweden and planted in one northern and one southern common garden, to test the hypothesis that onset of autumn senescence is triggered by day length. We confirmed that, although bud set seemed to be triggered by a critical photoperiod/day length, other factors may influence it. The data on initiation of autumn senescence, on the other hand, were incompatible with the trigger being the day length per se, hence the trigger must be some other light-dependent factor.

Place, publisher, year, edition, pages
John Wiley & Sons, 2018
National Category
urn:nbn:se:umu:diva-143636 (URN)10.1111/ppl.12593 (DOI)000418236000008 ()28591431 (PubMedID)
Available from: 2018-01-08 Created: 2018-01-08 Last updated: 2018-06-09Bibliographically approved

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