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Storage lipid accumulation is controlled by photoperiodic signal acting via regulators of growth cessation and dormancy in hybrid aspen
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysiologisk botanik. Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Umeå Plant Science Centre (UPSC).ORCID-id: 0000-0001-6031-005x
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysiologisk botanik. Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Umeå Plant Science Centre (UPSC).
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2018 (engelsk)Inngår i: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 219, nr 2, s. 619-630Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The signalling pathways that control seasonal modulation of carbon metabolism in perennial plants are poorly understood. Using genetic, metabolic and natural variation approaches, we identify factors mediating photoperiodic control of storage lipid accumulation in the model tree hybrid aspen (Populus tremula x tremuloides). We characterized lipid accumulation in transgenic hybrid aspen with impaired photoperiodic and hormonal responses. Genome-wide association mapping was performed in Swedish aspen (P.tremula) genotypes to determine genetic loci associated with genotype variation in lipid content. Our data show that the storage lipid triacylglycerol (TAG) accumulates in cambial meristem and pith rays of aspen in response to photoperiodic signal controlling growth cessation and dormancy induction. We show that photoperiodic control of TAG accumulation is mediated by the FLOWERING LOCUS T/CONSTANS module, which also controls the induction of growth cessation. Hormonal and chromatin remodelling pathways also contribute to TAG accumulation by photoperiodic signal. Natural variation exists in lipid accumulation that is controlled by input from multiple loci. Our data shed light on how the control of storage metabolism is temporally coordinated with growth cessation and dormancy by photoperiodic signal, and reveals that storage lipid accumulation between seeds and perennating organs of trees may involve distinct regulatory circuits.

sted, utgiver, år, opplag, sider
John Wiley & Sons, 2018. Vol. 219, nr 2, s. 619-630
Emneord [en]
abscisic acid (ABA), dormancy, flowering time, growth cessation, lipid biosynthesis, photoperiod, trees, triacylglycerol
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Identifikatorer
URN: urn:nbn:se:umu:diva-150755DOI: 10.1111/nph.15197ISI: 000435948500017PubMedID: 29761498OAI: oai:DiVA.org:umu-150755DiVA, id: diva2:1242057
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Bio4EnergyTilgjengelig fra: 2018-08-27 Laget: 2018-08-27 Sist oppdatert: 2019-09-06bibliografisk kontrollert

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