Salicylic acid metabolism and signalling coordinate senescence initiation in aspen in nature

Jenna Lihavainen, Jan Šimura, Pushan Bag, Nazeer Fataftah, Kathryn Megan Robinson, Nicolas Delhomme, Ondřej Novák, Karin Ljung and Stefan Jansson ()
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Jenna Lihavainen: Umeå University
Jan Šimura: Swedish University of Agricultural Sciences
Pushan Bag: Umeå University
Nazeer Fataftah: Umeå University
Kathryn Megan Robinson: Umeå University
Nicolas Delhomme: Swedish University of Agricultural Sciences
Ondřej Novák: Swedish University of Agricultural Sciences
Karin Ljung: Swedish University of Agricultural Sciences
Stefan Jansson: Umeå University

Nature Communications, 2023, vol. 14, issue 1, 1-20

Abstract: Abstract Deciduous trees exhibit a spectacular phenomenon of autumn senescence driven by the seasonality of their growth environment, yet there is no consensus which external or internal cues trigger it. Senescence starts at different times in European aspen (Populus tremula L.) genotypes grown in same location. By integrating omics studies, we demonstrate that aspen genotypes utilize similar transcriptional cascades and metabolic cues to initiate senescence, but at different times during autumn. The timing of autumn senescence initiation appeared to be controlled by two consecutive “switches”; 1) first the environmental variation induced the rewiring of the transcriptional network, stress signalling pathways and metabolic perturbations and 2) the start of senescence process was defined by the ability of the genotype to activate and sustain stress tolerance mechanisms mediated by salicylic acid. We propose that salicylic acid represses the onset of leaf senescence in stressful natural conditions, rather than promoting it as often observed in annual plants.

Date: 2023
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DOI: 10.1038/s41467-023-39564-5

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